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. 2022 Oct 25;11(4):68. doi: 10.3390/antib11040068

Shared 6mer Peptides of Human and Omicron (21K and 21L) at SARS-CoV-2 Mutation Sites

Yekbun Adiguzel 1,*, Yehuda Shoenfeld 2
Editor: Kai Schulze-Forster
PMCID: PMC9680445  PMID: 36412834

Abstract

We investigated the short sequences involving Omicron 21K and Omicron 21L variants to reveal any possible molecular mimicry-associated autoimmunity risks and changes in those. We first identified common 6mers of the viral and human protein sequences present for both the mutant (Omicron) and nonmutant (SARS-CoV-2) versions of the same viral sequence and then predicted the binding affinities of those sequences to the HLA supertype representatives. We evaluated change in the potential autoimmunity risk, through comparative assessment of the nonmutant and mutant viral sequences and their similar human peptides with common 6mers and affinities to the same HLA allele. This change is the lost and the new, or de novo, autoimmunity risk, associated with the mutations in the Omicron 21K and Omicron 21L variants. Accordingly, e.g., the affinity of virus-similar sequences of the Ig heavy chain junction regions shifted from the HLA-B*15:01 to the HLA-A*01:01 allele at the mutant sequences. Additionally, peptides of different human proteins sharing 6mers with SARS-CoV-2 proteins at the mutation sites of interest and with affinities to the HLA-B*07:02 allele, such as the respective SARS-CoV-2 sequences, were lost. Among all, any possible molecular mimicry-associated novel risk appeared to be prominent in HLA-A*24:02 and HLA-B*27:05 serotypes upon infection with Omicron 21L. Associated disease, pathway, and tissue expression data supported possible new risks for the HLA-B*27:05 and HLA-A*01:01 serotypes, while the risks for the HLA-B*07:02 serotypes could have been lost or diminished, and those for the HLA-A*03:01 serotypes could have been retained, for the individuals infected with Omicron variants under study. These are likely to affect the complications related to cross-reactions influencing the relevant HLA serotypes upon infection with Omicron 21K and Omicron 21L.

Keywords: HLA class I, peptide similarity, SARS-CoV-2, COVID-19, disease susceptibility, autoimmunity

1. Introduction

COVID-19 pandemic had a distinct impact on our lives and will possibly affect us more due to its potentially prolonged health outcomes. The disease severity of COVID-19 is immune-related, but the relationship is not straightforward [1,2,3,4,5,6]. The immune responses of people with the disease can lead to autoimmune reactions through the involvement of HLA alleles [7,8,9,10]. Autoimmunity related features are observed in patients with COVID-19 [11,12,13,14,15,16]. Such a probable connection [17,18,19,20,21,22] also led to therapeutic suggestions [23,24,25]. Molecular mimicry is a possible mechanism of autoimmunity induction after infection and even vaccination, where Kanduc and Shoenfeld [26,27,28], and several authors have studied that possibility, along with disease severity upon infection [29,30,31,32,33,34,35,36,37]. A molecular mimicry map of SARS-CoV-2 was also generated [38], and earlier [39], autoimmune-linked MHC alleles (class I and class II) were published [38,40,41,42,43,44]. Emerging variants of concern, specifically the widespread Omicron variant, drew attention [45,46,47] without an Omicron-sourced autoimmunity focus, despite some literature with a broader or a different focus [48,49,50]. Changes in infectivity, prevention by vaccination, and other concerns [51,52,53,54], were of more interest. On a similar basis, there is a need to investigate the possible changes in molecular mimicry-based autoimmunity risk. In accordance, cross-reactivities of Ig antibodies and virus neutralization in mRNA vaccinated people were reported [55], implying the need for more studies. Consequently, the possible molecular mimicry-based autoimmunity risk of the Omicron Nextstrain clades 21K and 21L was investigated here.

We looked for SARS-CoV-2 and Omicron (21K and 21L) peptides at the respective mutation sites and identified those not only similar human proteins but also with affinities to the same HLA alleles as those binding strongly to their similar human peptides. The results were evaluated comparatively. Therefore, the purpose of this work was primarily to identify peptides of human proteins sharing the 6mer with the Omicron 21K and Omicron 21L variants, and with a cross-reaction risk, compared to the respective nonmutant SARS-CoV-2 peptides. This was suggested to pose a risk of molecular mimicry-based autoimmunity, in susceptible individuals, once infected.

2. Materials and Methods

This study is conducted with the dataset (Supplementary Data mentioned at the data availability statement, Figure S1 and Document S1–S10) generated to investigate the possible health effects of concern, aroused by human protein-similarities of Omicron (21K and 21L) sequences with mutations. Here, potentially susceptible HLA serotypes were identified through similar human proteins with high affinity peptides. We started this work by generating 6mer sequences of the viral peptides at mutation sites, including both nonmutant (SARS-CoV-2) and mutant (Omicron 21K and Omicron 21L) versions. Then we performed NCBI [56] Blastp [57] searches of these peptides by limiting the search to human. Afterwards, we identified the 6mer-sharing human proteins present for both mutant and nonmutant versions of the viral sequences at the same mutation sites. Human protein-sequences with the aligned 6mers were retrieved from UniProt [58] and NCBI [56] in fasta format. The 8mers of these identified similar virus and human peptide pairs were predicted for their HLA affinities [59,60,61,62,63,64,65]. Strong-binder (SB < 0.5% rank) and weak-binder (0.5% < WB < 2% rank) results of NetMHCcons, and epitope (E) results of NetCTLpan were high affinity peptides, also referred to as peptides with affinity. Peptide pairs with high affinities to the same HLA allele were deemed as autoimmunity risk-bearing peptides in the susceptible individuals with those serotypes, upon infection with the virus of concern. Viral/human peptide pairs with high affinities were evaluated to infer changes in the autoimmunity risks for the susceptible serotypes upon infection, through lost or gained affinities of the viral/human peptide pairs. We also evaluated changes in the alleles with high affinities to the viral/human peptide pairs.

Features of the proteins were outlined through the information retrieved from NCBI Entrez [66], UniProtKB/Swiss Prot [58], MalaCards [67,68], SuperPathways [69], and ProteinDB [70,71], collected from the dedicated websites of the GeneCards [72]. Network images were prepared with that information and the data, using Cytoscape [73] version 3.8.2, running with Java 11.0.6. Phylogeny images were generated at covariants.org, on 26 May 2022. Further details of the methodology are provided in the Appendix A, within Appendix A.1.

3. Results and Discussion

The methodology of this study is summarized in Figure 1. Targeting only the human/Omicron peptide pairs with affinities to the same HLA allele, namely, identifying the human peptides that can cross-react with peptides of the Omicron 21K and Omicron 21L, would have been a classical approach. Differently, evaluation of its results compared to the results of human peptides that can cross-react with SARS-CoV-2 peptides at the mutation sites is a novel approach. This approach enabled us to obtain the essence of Omicron 21K- and Omicron 21L-sourced changes. With this, one may recognize how molecular mimicry-based autoimmunity risk could shift from one susceptible group to the other.

Figure 1.

Figure 1

The outline of the methodology. We first prepared 6mer peptides at the Omicron 21K and Omicron 21L mutation sites, along with the SARS-CoV-2 peptides at the respective mutation sites, and then performed blastp searches to find human proteins containing those 6mers. Human peptides sharing 6mers with SARS-CoV-2 and Omicron sequences at the same mutation sites were selected. Selected SARS-CoV-2/human and Omicron/human peptide pairs were predicted for their binding affinities to the HLA supertype representatives, to identify strong-binder (SB) and weak-binder (WB) peptides. Those peptide pairs with such high affinities to the same alleles were evaluated as the lost cross-reaction risks in the susceptible individuals, upon infection, if they were exclusively SARS-CoV-2/human peptide pairs. Such peptide pairs were evaluated as the new, or de novo, risks, if they were exclusively Omicron/human peptide pairs. They were evaluated as pertaining risks if they were both SARS-CoV-2/human and Omicron/human peptide pairs of sequences at the same mutation sites. Omicron/human peptide pairs included Omicron sequences that were separated into Omicron 21K sequences and Omicron 21L-specific sequences, where the Omicron 21K sequences also involved sequences at mutation sites common to both Omicron 21K and Omicron 21L.

3.1. Identified Human Proteins and Peptides

Information on the general features of the identified human proteins is provided in alphabetical order in the Appendix A, within Appendix A.2. The results of our current Blastp search extended the list of sequences obtained through our preliminary work [37] (Table 1). That preliminary work used more restricted parameters, and did not focus on 6mers, as in this work.

Table 1.

Omicron 21K and Omicron 21L spike protein sequences with similar sequences in the human proteome and with affinities to the same HLA alleles as those of the human sequences. Omicron/human common residues are written in bold, and residues with mutations are additionally underlined. Only the highlighted results at the fifth results-line are specific to Omicron 21L [37]. Adapted with permission from Kenes.

Omicron Peptide Human Peptide Human Protein Name Human Protein ID Allele Tool for Prediction
NLAPFFTF LLSPFFTF Ig kappa chain variable region ABA71433.1 HLA-A*24:02 NetCTLpan
NLAPFFTF LLSPFFTF Ig kappa chain variable region ABA71433.2 HLA-B*15:01 NetCTLpan
NLAPFFTF YLSPFFTY hCG2003071 EAW54993.1 HLA-B*15:01 NetCTLpan
YNLAPFFTF YYLSPFFTY hCG2003071 EAW54993.1 HLA-A*24:02 NetCTLpan/NetMHCcons
NFAPF-FAF FAPFLFAF hCG2023603 EAW76558.1 HLA-A*24:02 NetCTLpan
FPLRSYSF FPLRSFSY Ig heavy chain junction region MOM40044.1 HLA-B*07:02 NetCTLpan

Table 2 (row 1 to 11) displays the first part of the current results, belonging to SARS-CoV-2 peptides containing the Omicron 21K-specific, and Omicron 21K- and Omicron 21L-common, mutation sites. Human peptides sharing 6mers with them and having affinity to the same HLA allele are presented along. Table 2 (row 12 to 21) also displays the results for the corresponding mutant sequences, along with their similar human peptide sequences. The two parts of the table, i.e., results until row 12 and the results afterwards, exclude each other. Accordingly, potential cross-reactive peptides until row 10 represent the diminished risks due to mutations and those after row 11, except those at rows 18 and 19, represent the novel risks in the susceptible individuals, upon getting infected. Viral peptides displayed at rows 10 and 11, and at rows 18 and 19 are nonmutant and mutant versions of the same mutation site, respectively. Accordingly, human peptides mimicking those represent a retaining risk in case of the HLA-B*15:01 serotypes.

Table 2.

Virus and human peptides sharing 6mers at the mutation sites of interest and having affinity to the same HLA. The first 11 data rows are the respective SARS-CoV-2 and human peptides. The corresponding SARS-CoV-2 peptides are those at the Omicron 21K-specific mutation sites, and at the mutation sites common to Omicron 21K and Omicron 21L (i.e., 21K + 21K/21L). The rows from 12 to the end display human peptides sharing 6mers with the respective Omicron (21K + 21K/21L) sequences. Empty cells indicate that the data is the same as the data in the last filled cell above that row. Shared residues in the human peptides are written in bold.

HLA 1 SARS-CoV-2 Peptide Prediction 2 Human Peptide Prediction 2 Human Protein Name Human Protein ID 3
1 A2 TLACFVLA WB TLACFVAI WB Presenilin 2 (Alzheimer disease 4), isoform CRA_b EAW69797.1
2 FLACFVLV SB Adenosine receptor A2b NP_000667.1
3 B7 SPRRARSV SB/E SPRRARII SB Zinc finger protein 462 isoform X1 XP_006717272.1
4 SPRRARGH WB Pleckstrin homology domain-containing family A member 7 isoform X1 XP_047282382.1
5 GPRRARSA WB Unnamed protein product 4 BAG54301.1
6 PPRRARSV WB RhoGEF AAF79955.1
7 SPRRARSS WB Hermansky-Pudlak syndrome 1, isoform CRA_c EAW49879.1
8 B7 PPTSFGPL WB VPTSFGPL SB hCG1989297, isoform CRA_a EAW55845.1
9 B8 SPRRARSV WB/E SPRRARII WB Zinc finger protein 462 isoform X1 XP_006717272.1
10 B44 SEETGTLI WB/E PETGTLIV WB hCG1656811 EAW75628.1
11 B44 EETGTLIV WB
HLA 1 Omicron Peptide Prediction 2 Human Peptide Prediction 2 Protein Name Human Protein ID 3
12 A1 SGNYNYLY WB/E GLSGNYNY WB Immunoglobulin heavy chain junction region MOL95178.1
13 YGSGNYNY WB Immunoglobulin heavy chain junction region MOL73314.1
14 GSGNYNYY SB Immunoglobulin heavy chain junction region MBB1884951.1
15 SGNYNYFY WB Immunoglobulin heavy chain junction region MOL21912.1
16 A1 LTSFGPLV WB ILTSFGPY WB Dual specificity mitogen-activated protein kinase kinase 3 isoform X1 XP_016880346.2
17 B39 MHSALRLV WB DRHSALRL WB Human KCC1 structure determined in KCl and detergent GDN 6KKR_A
18 B44 SEEIGTLI WB/E AEEEIGTL SB 130K protein 5 CAA53661.1
19 B44 EEIGTLIV WB/E
20 B62 FLARGVVF SB/E AGARGVVF WB Immunoglobulin light chain junction region MCC96497.1
21 SGARGVVF WB Immunoglobulin light chain junction region MCB29717.1

1 A1: HLA-A*01:01, A2: HLA-A*02:01, A3: HLA-A*03:01, A24: HLA-A*24:02, A26: HLA-A*26:01, B7: HLA-B*07:02, B8: HLA-B*08:01, B62: HLA-B*15:01, B27: HLA-B*27:05, B39: HLA-B*39:01, B44: HLA-B*40:01, B58: HLA-B*58:01. 2 Weak-binder (WB) and strong-binder (SB) predictions by NetMHCcons, and epitope (E) predictions by NetCTLpan. 3 Only one protein ID, commonly the first one that appeared in the alignments, is provided. 4 Ring Finger Protein 10 was identified as an unnamed protein product in the Blastp alignment document. 5 RB Transcriptional Corepressor Like 2 was identified as 130K protein in the Blastp alignment document.

Table 3 (row 1 to 16) displays the results for SARS-CoV-2 peptides at the sites mutated specifically in Omicron 21L, and the human peptides both shared 6mers with them and had affinity to the same HLA allele. Table 3 (row 17 to 29) also displays results for the viral peptides with Omicron 21L-specific mutations, and human peptides both sharing 6mers with them and having an affinity to the same HLA allele. Potential cross-reactive peptides with the sequences displayed until row 17, except the results in rows 3–6, represent the diminished risks with mutations and the remaining peptides, except that displayed at row 20, represent novel risks. However, some data in Table 3 can be interpreted as de novo risks. For example, human peptides in rows 12 and 29, which are at two separate parts of the table, both shared 6 aa with the corresponding viral peptides at positions 367–374 of the spike protein, had affinity to the same allele, and belonged to the same type of protein. In another case, human peptides in rows 6 and 20, also shared 6 aa with the corresponding viral peptides and had affinity to the same allele but did not belong to the same type of protein. Additionally, viral peptides at row 3, and at row 20 are nonmutant and mutant versions of the same mutation site, respectively. Accordingly, human peptides mimicking those represent a retaining risk in case of the HLA-A*03:01 serotypes.

Table 3.

Viral (SARS-CoV-2 and Omicron 21L) and human peptides that share 6mers at the Omicron 21L-specific mutation sites and have affinity to the same HLA. The first 16 data rows are the respective SARS-CoV-2 and human peptides. The rest are the Omicron 21L and human peptides. (Table format features are the same as the relevant explanation at the caption of Table 2).

HLA 1 SARS-CoV-2 Peptide Prediction 2 Human Peptide Prediction 2 Human Protein Name Human Protein ID 3
1 A1 RTQLPPAY WB/E SIQLPPAY E Immunoglobulin light chain junction region MCD11024.1
2 A3 FLGVYYHK WB/E GTFLGVYY WB Immunoglobulin heavy chain junction region MBN4196023.1
3 A3 VLLPLTQY WB RLLPLTQY WB Protein HGH1 homolog NP_057542.2
4 RLLPLTQR WB Mitochondrial uncoupling protein 4 isoform 1 NP_004268.3
5 VLLPLTYY WB Immunoglobulin heavy chain junction region MBN4485217.1
6 KVLLPLTY WB Signaling lymphocytic activation molecule isoform a precursor NP_001317683.1
7 A26 NSASFSTF E SVASFSTF SB Immunoglobulin heavy chain variable region, partial UNJ97266.1
8 B58 RTQLPPAY E IQLPPAYW SB Immunoglobulin heavy chain junction region MOQ03906.1
9 B58 NSASFSTF WB/E ASFSTFTI WB Immunoglobulin heavy chain variable region, partial UNJ97266.1
10 B62 RTQLPPAY WB YQLPPAYY WB Immunoglobulin heavy chain junction region MCG70934.1
11 CQLPPAYY WB Ankyrin and armadillo repeat-containing protein isoform X1 XP_011508975.1
12 B62 VLYNSASF SB/E YNSASFTF WB Immunoglobulin light chain junction region MBB1719028.1
13 B62 NSASFSTF WB/E SVASFSTF SB Immunoglobulin heavy chain variable region, partial UNJ97266.1
14 B62 KGAGGHSY WB QGAGGHSY WB Immunoglobulin heavy chain junction region MBN4552893.1
15 B62 VLLPLTQY WB VLLPLTYY WB Immunoglobulin heavy chain junction region MBN4485217.1
16 RLLPLTQY WB Protein HGH1 homolog NP_057542.2
HLA 1 Omicron 21L Peptide Prediction 2 Human Peptide Prediction 2 Human Protein Name Human Protein ID 3
17 A1 FLDVYYHK WB FLDVYYGM WB Immunoglobulin heavy chain junction region MBN4448374.1
18 FLDVYYYY SB Immunoglobulin heavy chain junction region MCG72449.1
19 FLDVYYNL WB Beta-1,3-galactosyltransferase 5 isoform b NP_149362.2
20 A3 VLLPFTQY WB/E KVLLPFTR WB Nuclear pore membrane glycoprotein 210 precursor NP_079199.2
21 A24 DYSVLYNF WB/E SQSVLYNF WB Immunoglobulin light chain variable region, partial AHZ09416.1
22 A24 LYNFAPFF SB/E YNFAPFTF WB Immunoglobulin light chain junction region MCE34472.1
23 A24 NFAPFFAF SB/E VSAPFFAF WB Solute carrier family 22 member 6 isoform a NP_004781.2
24 SAPFFAFF WB Solute carrier family 22 member 6 isoform a NP_004781.2
25 B7 FPLRSYGF WB/E SPLRSYGM WB Immunoglobulin heavy chain junction region MBB2034746.1
26 B27 HRYGADLK SB/E HRYGADYY WB Immunoglobulin heavy chain junction region MBB1980753.1
27 B27 ARLCAKHY WB/E LRARLCAK SB Mucin, partial AAC15950.1
28 ARLCAKGV WB Mucin, partial AAC15950.1
29 B62 VLYNFAPF SB/E YNFAPFTF WB Immunoglobulin light chain junction region MCE34472.1

1 A1: HLA-A*01:01, A2: HLA-A*02:01, A3: HLA-A*03:01, A24: HLA-A*24:02, A26: HLA-A*26:01, B7: HLA-B*07:02, B8: HLA-B*08:01, B62: HLA-B*15:01, B27: HLA-B*27:05, B39: HLA-B*39:01, B44: HLA-B*40:01, B58: HLA-B*58:01. 2 Weak-binder (WB) and strong-binder (SB) predictions by NetMHCcons, and epitope (E) predictions by NetCTLpan. 3 Only one protein ID, commonly the first one that appeared in the alignments, is provided. e.g., FLDVYYGM was also a part of immunoglobulin heavy chain alpha VDJ region, partial (ID: AAD15877.1).

The numerical results of the data in Table 2 and Table 3 are presented in Table 4. WB/SB/E peptides of human proteins sharing 6mers with SARS-CoV-2 sequences at Omicron 21L-specific mutation sites in the Orf1ab protein region decreased the most (from 7 to 3). Deletions were more common than insertions among the mutations of interest in Omicron. Accordingly, a decrease in the number of sequences that can cross-react with human proteins was expected. However, this was not the case (Table 4).

Table 4.

The number of WB/SB/E predictions of human proteins (i.e., similar) sharing 6mer with SARS-CoV-2 or Omicron (21K and 21L) at mutation sites and having affinity to the same HLA allele. The first 4 data-columns exclude the relevant data of the Omicron 21L-specific mutation sites. The last 4 columns are the relevant data of the Omicron 21L-specific mutation sites.

SARS-CoV-2 Similar Sequences at Omicron (21K + 21K/21L) Sites Similar of Omicron (21K + 21K/21L) Sequences with Mutations SARS-CoV-2 Similar Sequences at Omicron 21L Sites Similar of Sequences with Omicron 21L-Specific Mutations
WB SB WB SB WB SB WB SB
Orf1ab 0 1 3 0 7 1 0 3 1
Spike 5 1 3 1 6 3 8 1
Orf9b 0 0 1 0 0 0 0 0
Envelope 1 0 0 1 0 0 0 0
Matrix 1 1 0 0 0 0 0 0
Total 7 3 7 2 13 3 11 2

One different sequence was predicted as E by NetCTLpan. It was included in the WB column. The other respective predictions of NetCTLpan were common to NetMHCcons.

Figure 2 presents the numbers of SARS-CoV-2 and Omicron (21K and 21L) similar human peptides (SARS-CoV-2sim and Omicronsim) with predicted-affinities to the given HLA alleles of interest. Figure 2 indicates a possible shift of the alleles, which could put the individuals at risk. One can roughly view the SARS-CoV-2sim data in Figure 2 as the lost risks due to the mutations and the Omicronsim data as the new or de novo risks, with exceptions of those termed as retaining risks, mentioned above. Six of the Omicron-similar peptides with HLA-A*01:01 affinities were immunoglobulin (Ig) heavy chain junction regions (Table 2, rows 12−15, and Table 3, rows 17−18). Ig light chain or heavy chain parts made-up 5 of the 7 SARS-CoV-2 similar peptides with affinities to the HLA-B*15:01 allele (Table 3, rows 10–16). Such peptides can lead to the generation of anti-idiotypic autoantibodies. These results were interpreted as a shift of the Ig heavy chain junction-sourced peptide affinities from the HLA-B*15:01 allele to the HLA-A*01:01 allele. This interpretation was based additionally on the overall comparison of the data in Table 2 and Table 3. This shift is also illustrated in Figure 2. Along with this shift, there was also a decrease in the potential risk of anti-idiotypic antibodies generated against the Ig heavy chain variable regions.

Figure 2.

Figure 2

Networks of human proteins with virus-similar peptides at the mutation sites of interest and the HLA alleles, to which they had affinity. Alleles are connected to the proteins through the peptide of that protein mimicking the viral peptide and with strong affinity to the connected allele, such as the mimicked viral peptide. The top part displays those of human proteins with SARS-CoV-2 similar (SARS-CoV-2sim) peptides. The bottom part displays those of human proteins with Omicron similar (Omicronsim) peptides. Alleles at both parts are encircled with the same color indicator of that allele. Other alleles are not encircled. Red edges (i.e., connections) belong to the human proteins sharing 6mers with SARS-CoV-2 sequences at Omicron 21L-specific mutation sites (on top), and to the human proteins sharing 6mers with sequences containing Omicron 21L-specific mutations (at the bottom). Affinity refers to weak-binder/strong-binder/epitope (WB/SB/E). (Ring Finger Protein 10 was identified as an unnamed protein product in the Blastp alignment document).

Differences in the peptides with HLA-A*24:02 affinities were due to Omicron 21L-specific mutations, as they are observed exclusively in the second part of Table 3, which belongs to the respective results of the 21L-specific mutations. These mutations led to new, similar human peptides with WB/SB affinity. Differences in the peptides with HLA-B*07:02 affinities were due to mutations other than the Omicron 21L-specific ones, which led to the loss of similar human peptides with affinities to that allele (rows 3−7, Table 2). Additionally, in that case, peptides sourced by different types of proteins shared the same 6mer of the SARS-CoV-2 peptide. This is well illustrated in Figure 2 as well. Finally, any possible molecular mimicry-associated novel risk seemed to be the most prominent in Omicron 21L-infected HLA-A*24:02 and HLA-B*27:05 serotypes (Figure 2), based on the present data.

3.2. Disorders, Pathways, and Expression Sites

Figure 3 displays the number of disorders per protein identified here, excluding those without data at Genecards. Mucin, viral-peptide mimicking part of which was identified to be involving in a novel risk for the HLA-B*27:05 serotypes, was associated with the highest number of disorders, and the next protein was presenilin 2, which was suggested to be rather in a lost risk due to containing a SARS-CoV-2 mimicking peptide with affinity to the HLA-A*02:01 allele. The identified proteins did not share the associated disorders. Table A1 at Appendix A presents the list of disorders associated with the identified proteins.

Figure 3.

Figure 3

Number of disorders associated with the identified human proteins in descending order. Mucin is outstanding with the highest number of associated disorders, compared to the other proteins with the respective data (Appendix A, Table A1).

Figure 4 presents the number of the associated superpathways with the identified proteins. The majority of involved superpathways were associated with only one identified protein. Each identified protein associated with several numbers of different superpathways, as revealed by the excess of associated superpathways compared to the present number of identified proteins. In four cases, more than 2 proteins associated with a superpathway, as follows:

Figure 4.

Figure 4

Number of associated superpathways of the identified human proteins in descending order. Mitogen activated protein kinase kinase 3 is outstanding with the highest number of associated superpathways, compared to the other proteins with the respective data (Appendix A, Table A2).

Mucin 5AC (MUC5AC), mitogen activated protein kinase kinase 3 (MAP2K3), and nucleoporin 210 (NUP210) share the innate immune system.

Presenilin 2 (PSEN2), MAP2K3, and Rho Guanine Exchange Factor 4 (ARHGEF4) share ERK signaling.

NUP210, beta-1,3-galactosyltransferase 5, and solute carrier family 25 member, 27 share metabolism.

MUC5AC, NUP210, MAP2K3, and PSEN2 share the superpathway disease.

The number of superpathways shared by 2 proteins was 22. MAP2K3 was the most frequently (i.e., 13) observed protein in those superpathways shared by 2 proteins. Among those superpathways, MAPK-Erk was shared by the proteins MAP2K3 and RB transcriptional corepressor like 2 (130K protein). Although viral-peptide mimicking part of the 130K protein was identified here to be involving in a retained risk for the HLA-B*40:01 serotypes, that of the MAP2K3 protein was found to carry a potential of leading to a new autoimmune reaction risk in the HLA-A*01:01 serotypes. The risk would have been more if the respective peptide of 130K protein and the Omicron peptide it mimicked both had affinities to the HLA-A*01:01 allele.

PSEN2 and NUP210 were the two succeeding proteins associated with the highest number of superpathways (Figure 4), ARHGEF4 had the second-highest rate of presence (i.e., 7) in the superpathways shared by 2 proteins. ARHGEF4 and MAP2K3 comprised the two proteins in 5 superpathways shared by 2 proteins, but ARHGEF4 viral-peptide mimicking part of it was identified to be involving in a lost risk for the HLA-B*07:02 serotypes. Table A2 at Appendix A presents the list of superpathways associated with the identified proteins.

Table A3 at Appendix A presents the list of tissues expressing the identified proteins, along with the expression levels. The total number of tissues expressing MAP2K3 was the highest (i.e., 42, Figure 5). It is expressed in almost all tissues displayed in Figure 6, except the prefrontal cortex, osteosarcoma cells, spermatozoon, cervical mucosa, and bone. Therefore, if infected, cross-reaction of the Omicron 21K-mimicking peptide of MAP2K3 in the HLA-A*01:01 serotypes could involve several tissues and organs. Among those, adipocyte, oral epithelium, skin, uterine cervix, and uterus are expressing only MAP2K3, while cervical mucosa is expressing only MUC5AC, and cardia is expressing MAP2K3 and MUC5AC, among the identified proteins (Appendix A, Table A3).

Figure 5.

Figure 5

Number of tissues expressing the identified human proteins in descending order. The highest number of tissues express mitogen activated protein kinase kinase 3, compared to the expression of the other proteins with the respective data (Appendix A, Table A3).

Figure 6.

Figure 6

Networks of the identified human proteins with the tissues expressing them. Proteins with the abbreviations in the figure: Beta-1,3-Galactosyltransferase 5 (B3GALT5), HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 (HPS1), Mitogen-Activated Protein Kinase Kinase 3 (MAP2K3), Mucin 5AC, Oligomeric Mucus/Gel-Forming (MUC5AC), Nucleoporin 210 (NUP210), Pleckstrin Homology Domain Containing A7 (PLEKHA7), Presenilin 2 (PSEN2), RB Transcriptional Corepressor Like 2 (RBL), Rho Guanine Nucleotide Exchange Factor 4 (ARHGEF4), Ring Finger Protein 10 (RNF10), Signaling Lymphocytic Activation Molecule Family Member 1 (SLAMF1), Solute Carrier Family 12 Member 4 (SLC12A4), Solute Carrier Family 22 Member 6 (SLC22A6), Solute Carrier Family 25 Member 27 (SLC25A27), Zinc Finger Protein 462 (ZNF462). (Identified proteins without the relevant data in the database are not represented in the figures. See Appendix A.2).

If we look at the total average normalized intensities of the expression levels of the identified human proteins, gall bladder has the highest expressions of the identified proteins with Omicron-similar sequences, followed by breast cancer cell, colon, rectum, stomach, thyroid glands, and pancreas (Figure 7). High expression of the given proteins in those tissues could categorize them as potentially the most vulnerable targets if an autoimmune reaction is developed against those proteins, in the susceptible individuals who are infected with the Omicron variant. The total average normalized intensity of the expressed proteins exclusively with Omicron similar sequences was approximately two times greater than that of proteins exclusively with SARS-CoV-2 similar sequences. It should be reminded that any suggested biological relevance is limited to the possible effects of the mutation sites of the Omicron 21K and Omicron 21L variants.

Figure 7.

Figure 7

Total average normalized intensities of the identified human protein expression levels in the given tissues, in descending order of the total average normalized intensities of the expressed proteins with Omicron-similar peptides.

The efforts in this study were to specify the serotypes at risk and to explain a possible mechanism of the shift in disease severity among certain serotypes, due to mutations in Omicron 21K and Omicron 21L. However, other than individual susceptibilities, there is also the possibility of becoming infected with a different variant, which is immense even among the Omicron 21K and Omicron 21L, in addition to the other variants (Figure 8). Studies such as this one aim to provide a generalized understanding. In line with this aim, Section 3.2 of this study revealed that associated disorders and superpathways of the identified human proteins with Omicron mimicking peptides revealed possible new risk for the HLA-B*27:05 and HLA-A*01:01 serotypes, respectively (Figure 9). The latter is supported by the tissue-expression data (Figure 9). On the other hand, risk for the HLA-B*07:02 serotypes could have been diminished (Figure 9) and that for the HLA-A*03:01 serotypes could have been retained. Finally, high affinity peptides of the human proteins identified here are not yet observed in vivo or in vitro as autoantigens. However, that is likely because of lacking experimental studies aiming to detect those autoantibodies. In support of the possibility of demonstrating the presence of autoantibodies, cross-reaction of peptide PFERD at 463–467 positions of the spike protein receptor binding domain (S1-RBD) of SARS-CoV-2 with the human cell receptor angiotensin-converting enzyme 2 was delicately identified by Lai et al. [74], through several experimental steps, which are the demonstration of cross-reaction in patients’ sera (1), demonstration of cross-reaction in sera of mice immunized with recombinant S1-RBD (2), identification of monoclonal antibodies (mAbs) that could cross-react (3), and finding the cross-reactive antigenic peptide that could bind strongly to the autoreactive mAb (4).

Figure 8.

Figure 8

Phylogenetic analysis of the SARS-CoV-2 clusters, including 21K (Omicron) and 21L (Omicron). Image generated at covariants.org, on 26 May 2022.

Figure 9.

Figure 9

Total number of associated disorders, pathways, and expression levels (blue), along with the number of expressing tissues (orange), of the identified human proteins, with respect to the high affinity alleles of the viral peptide mimicking parts of those proteins. The total number of associated disorders reveals a possible risk in case of the HLA-B*27:05 serotypes (a). The total number of associated superpathways reveals a possible risk in case of the HLA-A*01:01 serotypes upon getting infected with the Omicron variant (b), which is supported by the total number of expression levels in (c). Collective data of approximately 7–8 identified proteins with the relevant information were used to plot the graphs.

This work focused on human molecular mimicry-based autoimmunity risk changes in different HLA serotypes, by considering only the sequences at mutation sites of the nonmutant SARS-CoV-2 and mutant Omicron (21K and 21L) sequences into account. Such changes can influence viral evolution, yet the involvement of the HLA interactions with the spike protein [75] could be the major driving factor, along with its effects on transmissibility [76], and with the contribution of vaccines to this phenomenon. Accordingly, amendments of our work can involve conducting a study with a broader perspective, by including considerations on different aspects of HLA interactions, in addition to evaluating the missed and eliminated data due to selected search parameters/criteria, including a possible future work on the shared 5mers. Studying mutations of the other variants, plus their recombination [77], and predicting affinities to the other alleles, including especially the class II alleles, are of importance.

4. Conclusions

A change in the potential autoimmunity risk is any loss in the potential autoimmunity risk due to mutations, with any new or de novo risks associated with those mutation sites. We identified the lost and gained similarities with the human peptides, as a risk of triggering autoimmunity due to cross-reactivity in susceptible individuals infected with Omicron 21K and Omicron 21L. Among all, any possible molecular mimicry-associated novel risk seemed to be the most prominent in HLA-B*27:05 and maybe also in HLA-A*24:02 serotypes who are infected with Omicron 21L. Results further supported possible new risk for the HLA-B*27:05 and HLA-A*01:01 serotypes, while the risk for the HLA-B*07:02 serotypes could have been lost or diminished, and that for the HLA-A*03:01 serotypes could have been retained, for the individuals infected with Omicron variants under study. While the results require clinical validation, they may provide an explanation for such a possible autoimmunity-related new or lost symptoms in Omicron 21K- or Omicron 21L-infected susceptible individuals.

Supplementary Materials

The following supporting information can be downloaded at: https://www.mdpi.com/article/10.3390/antib11040068/s1, and available as Mendeley Data [78]. Figure S1: Relevant mutations displayed at covariants.org, on 26 May 2022. Document S1: Blastp search input sequences involving mutations specific for Omicron 21K and mutations common to both Omicron 21K and Omicron 21L, along with the respective SARS-CoV-2 sequences. Document S2: Blastp search input sequences involving mutations specific for Omicron 21L, along with the respective SARS-CoV-2 sequences. Document S3: Alignment output of Blastp search with the input sequences involving mutations specific for Omicron 21K and mutations common to both Omicron 21K and Omicron 21L. Document S4: Alignment output of Blastp search with the input sequences involving mutations specific for Omicron 21L. Document S5: NetCTLpan HLA prediction-results of 364 human sequences sharing 6mers with sequences involving Omicron 21K-specific mutations and with sequences involving mutations common to both Omicron 21K and Omicron 21L (Last 1-peptide prediction was performed after the initial 363-peptides prediction). Document S6: NetMHCcons HLA prediction-results of 364 human sequences sharing 6mers with sequences involving Omicron 21K-specific mutations and with sequences involving mutations common to both Omicron 21K and Omicron 21L (Last 1-peptide prediction was performed after the initial 363-peptides prediction). Document S7: NetCTLpan HLA prediction-results of 242 human sequences sharing 6mers with sequences involving Omicron 21L-specific mutations (Last 9-peptide prediction was performed after the 233-peptides prediction results). Document S8: NetMHCcons HLA prediction-results of 242 human sequences sharing 6mers with sequences involving Omicron 21L-specific mutations (Last 9-peptide prediction was performed after the 233-peptides prediction results). Document S9: Source organisms of the initially predicted 363 sequences in documents S5 and S6. (Includes deleted results after predictions indicated with a stroke-through the content at the respective lines). Document S10: Source organisms of the initially predicted 233 sequences in documents S7 and S8. (Includes corrected names after predictions, at ID#217–219). Document S11: NetCTLpan HLA prediction-results of 333 sequences involving Omicron 21K-specific mutations and sequences involving mutations common to both Omicron 21K and Omicron 21L. Document S12: NetMHCcons HLA prediction-results of 333 sequences involving Omicron 21K-specific mutations and sequences involving mutations common to both Omicron 21K and Omicron 21L. Document S13: NetCTLpan HLA prediction-results of 206 sequences involving Omicron 21L-specific mutations. Document S14: NetMHCcons HLA prediction-results of 206 sequences involving Omicron 21L-specific mutations.

Appendix A

Appendix A.1. Extended Materials and Methods

Appendix A.1.1. The Blastp Searches

National Center for Biotechnology (NCBI) was the main source for sequence information of SARS-CoV-2 reference proteins [56]. These proteins were open reading frame (Orf)1ab (ID: YP_009724389.1) containing Orf1a, nonstructural protein (Nsp)3, Nsp4, Nsp5, Nsp6, and Orf1b; spike glycoprotein (S, ID: YP_009724390.1); Orf9b (ID: P0DTD2); envelope protein (E, ID: YP_009724392.1); nucleocapsid protein (N, ID: YP_009724397.2); and matrix protein (M, ID: YP_009724393.1). Mutations of the Omicron Nextstrain clades 21K and 21L were obtained from covariants.org, on 26 May 2022. Six amino acid (aa)-long sequences (6mers) at the mutation sites of the viral proteins were generated by a sliding-window approach, namely by including all respective sequences with possible different positions of a mutation, starting from the first to the last, i.e., the sixth, position. These 6mers were used in Blastp [57] searches at NCBI, as input. The Blastp search parameters (algorithm-options) were as follows: max target sequences 10, no automatic adjustment for short sequences, expect threshold 50, word size 2, max matches in a query range 0, matrix PAM30, gap costs 9, 1, no compositional adjustment. Searches were limited to Homo sapiens (taxid: 9606). The resulting alignments were analyzed manually following the search. Alignment results with 6mer matches were selected. Human sequences mimicking Omicron 21K and/or Omicron 21L were selected when there were also human peptides with 6mer matches with the respective nonmutant SARS-CoV-2 sequences.

Appendix A.1.2. HLA Affinity Predictions

Human protein-sequences with the aligned 6mers were retrieved from UniProt [58] and NCBI [56] in fasta format, to include 1 or 2 aa from either side of the 6mers before HLA affinity predictions of the 8mers. HLA affinity predictions were completed for the HLA supertype representatives (HLA-A*01:01, HLA-A*02:01, HLA-A*03:01, HLA-A*24:02, HLA-A*26:01, HLA-B*07:02, HLA-B*08:01, HLA-B*15:01, HLA-B*27:05, HLA-B*39:01, HLA-B*40:01, HLA-B*58:01), using NetMHCcons and NetCTLpan. NetMHCcons v1.1 [59] predicts HLA affinities by integrating NetMHC v4.0 [60,61], PickPocket v1.1 [62], and NetMHCpan v4.1 [63]. NetCTLpan (v1.1 [64] and v1.2 [65]) predicts cytotoxic T lymphocyte epitopes. Affinity to HLA meant strong binder (SB) and weak binder (WB) predictions by NetMHCcons, and epitope (E) predictions by NetCTLpan. The threshold for strong binders (SBs) percent rank was 0.5 and that of the weak binders (WBs) was 2, in the case of NetMHCcons. NetCTLpan performed instead epitope (E) assignment, where the threshold for identification was 1, by default. SB peptides below the specified percent ranks and WB peptides between the specified (2 for WB, until 0.5 for SB) percent ranks were identified. Percent rank was the percentile of the predicted binding affinity, which was compared to the distribution of affinities that were calculated on a set of (at least) 200.000 random natural 9mer peptides, as informed at the respective websites: https://services.healthtech.dtu.dk/service.php?NetCTLpan-1.1 (accessed on 17 October 2022) (for NetCTLpan) and https://services.healthtech.dtu.dk/service.php?NetMHCcons-1.1 (accessed on 17 October 2022) (for NetMHCcons) These results were considered significant. The resulting viral/human peptide pairs with high affinities were considered to suggest changes in the autoimmunity risks for the susceptible serotypes, upon getting infected, through lost affinities of the SARS-CoV-2/human peptide pairs or gained affinities of the Omicron/human peptide pairs. We also evaluated changes in the alleles with a high affinity to the viral/human peptide pairs.

Appendix A.1.3. Protein Features and Images

Features of the proteins were outlined through the information retrieved from NCBI Entrez [66], UniProtKB/Swiss Prot [58], MalaCards [67,68], SuperPathways [69], and ProteinDB [70,71], collected from the dedicated websites of the GeneCards [72]. Network images were prepared with that information and the data, using Cytoscape [73] version 3.8.2 running with Java 11.0.6. Phylogeny images were generated at covariants.org, on 26 May 2022.

This study additionally separated the results related to sequences with mutations specific for Omicron 21L. When its data was presented separately, the results with sequences of the Omicron variant were commonly denoted either as 21L, standing for the sequences with mutations specific for Omicron 21L, or as “21K + 21K/21L,” standing for the sequences with mutations specific for Omicron 21K plus mutations that are common to both Omicron 21K and Omicron 21L. Therefore, the data with Omicron 21L excludes the data of sequences with mutations common to both Omicron 21K and Omicron 21L.

Appendix A.2. General Features of the Identified Human Proteins

  • Ankyrin and Armadillo Repeat Containing (ANKAR) protein is predicted to be an integral membrane-component and the Gene Ontology annotations related to its gene include binding, binding to the nuclear receptor (Entrez, GeneCards). It is expressed in the heart and pancreatic juice (information from the estimated protein expression figure, GeneCards)

  • Beta-1,3-galactosyltransferase 5 is a membrane-bound glycoprotein with galactosyltransferase and UDP-galactose:beta-N-acetylglucosamine beta-1,3-galactosyltransferase activities (Entrez, GeneCards).

  • HGH1 homolog protein includes Maturity-Onset Diabetes of The Young, Type 3, as the associated disease (GeneCards). It is expressed in plasma, peripheral blood mononuclear cells, heart, bone, and pancreas (information retrieved from the estimated protein expression figure, GeneCards).

  • HPS1 Biogenesis of Lysosomal Organelles Complex 3 Subunit 1 involves in the Hermansky-Pudlak Syndrome 1. Membrane trafficking and RAB GEF nucleotide exchange are among the pathways of its related superpathways, i.e., vesicle-mediated transport and Rab regulation of trafficking (GeneCards).

  • The immunoglobulin (Ig) heavy chain variable region participates in antigen recognition, and membrane-bound immunoglobulins trigger clonal expansion and differentiation of B lymphocytes into Ig-secreting plasma cells (UniProtKB/Swiss-Prot, Entrez). Variable domains of one heavy and one (associated) light chain form two antigen binding sites with high affinity for an antigen (UniProtKB/Swiss-Prot, Entrez). Accordingly, Ig heavy chain and light chain variable regions, and the respective junction regions, are parts of the immune response.

  • Mitogen-activated protein kinase kinase 3 is a dual specificity kinase, has transferase and protein tyrosine kinase activities, and its activation by cytokines, mitogens, environmental stress, and insulin is reported while the accumulation of its active form is observed during Ras oncogene expression, followed by oncogenic transformation (GeneCards, UniProtKB/Swiss-Prot, Entrez). Its inhibition is involved in the pathogenesis of Yersinia pseudotuberculosis (Entrez).

  • Mucin 5AC, Oligomeric Mucus/Gel-Forming, is an extracellular matrix structural constituent, a gel-forming, protective glycoprotein of gastric and respiratory tract epithelia and interacts with H. pylori (GeneCards, UniProtKB/Swiss-Prot).

  • Nucleoporin 210 is a glycoprotein and is essential for the assembly, fusion, spacing, and integrity of the nuclear pore complex, which regulates macromolecular flow (Entrez, UniProtKB/Swiss-Prot). SARS-CoV-2 infection is among the pathways in which it is involved (Superpathways, GeneCards).

  • The pleckstrin homology domain containing A7 enables delta-catenin binding activity in many cellular components, resulting in epithelial cell–cell adhesion, pore complex assembly, and zonula adherens maintenance (Entrez).

  • Presenilin 2 is likely a part of the catalytic subunit of the gamma-secretase complex, which is an endoprotease complex catalyzing intramembrane cleavage of integral membrane proteins (e.g., Notch receptors, amyloid-beta precursor) (UniProtKB/Swiss-Prot). It is also suggested to take part in cytoplasmic protein partitioning, intracellular signaling and gene expression, and other cellular events (UniProtKB/Swiss-Prot).

  • RB Transcriptional Corepressor Like 2 (identified as 130K protein in the Blastp alignment document) is the main regulator of entry into the cell division (UniProtKB/Swiss-Prot). It “enables promoter-specific chromatin binding activity” (Entrez), can lead to (epigenetic) transcriptional repression by recruiting chromatin-modifier enzymes, histone methyltransferases, and may be involved in the transforming capacity of the adenovirus E1A protein, as well as acting as a tumor suppressor (GeneCards, UniProtKB/Swiss-Prot).

  • Rho guanine nucleotide exchange factor 4 complexes with G proteins; acts as guanine nucleotide exchange factor; and stimulates Rho-dependent signals, thus participating in many extracellularly stimulated processes, as well as tumor angiogenesis (Entrez, UniProtKB/Swiss-Prot). It may play a role in intestinal adenoma formation and tumor progression (UniProtKB/Swiss-Prot).

  • Ring Finger Protein 10 (identified as an unnamed protein product in the Blastp alignment document) related Gene Ontology annotations include activity of ubiquitin-protein transferase, and binding of transcription cis-regulatory region, and is involved in protein–protein interactions (GeneCards, Entrez). It is a Schwann cell differentiation and myelination regulator (UniProtKB/Swiss-Prot). Please note that the identified “unnamed protein product” had a similar sequence to the Ring Finger Protein 10 (RNF 10), although the RFN10 did not contain the region with the sequence in our results. However, the rest of its sequence was the same. Hence, the disorders, pathways, and expression sites related to RNF10 were included in the presented data.

  • Signaling Lymphocytic Activation Molecule Family Member 1 is a self-ligand receptor of the signaling lymphocytic activation molecule (SLAM) family and is thus involved in modulation of the immune cell activation and differentiation, innate and adaptive immune response regulation and interconnection (UniProtKB/Swiss-Prot).

  • Solute carrier family 12 member 4 (human KCC1 structure determined in KCl and detergent GDN) mediates the coupled transport of potassium and chloride ions across the plasma membrane, upon activation by the swelling of the cell (Entrez, UniProtKB/Swiss-Prot).

  • Solute carrier family 22 member 6 is involved in the sodium-dependent transport and the renal elimination of endogenous and exogenous organic anions, some of which can be toxic; exchanges organic anions with a coupling; and mediates several sodium-independent uptakes (UniProtKB/Swiss-Prot, Entrez).

  • Solute carrier family 25 member 27 (mitochondrial uncoupling protein 4) uncouples oxidative phosphorylation from ATP synthesis, and energy is dissipated in the form of heat as a result (UniProtKB/Swiss-Prot).

  • Zinc finger protein 462 is probably involved in transcriptional regulation through the structure and organization of chromatin, leading to the regulation of, for example, pluripotency and differentiation of embryonic stem cells, and the development and differentiation of neurons (Entrez, UniProtKB/Swiss-Prot).

Table A1.

Disorders associated with the identified proteins, in the order of ascending number of associated diseases. (Information retrieved from the resources detailed in the Materials and Methods).

Protein
      Disorder(s)
HGH1 Homolog
      Maturity-Onset Diabetes Of The Young, Type 3
Solute Carrier Family 25 Member 27
      Ecthyma
      Hepatocellular Carcinoma
Rho Guanine Nucleotide Exchange Factor 4
      Epidermolysis Bullosa Simplex 1a, Generalized Severe
      Locked-In Syndrome
Beta-1,3-Galactosyltransferase 5
      Mood Disorder
      Pancreatic Cancer
Ring Finger Protein 10
      Spastic Paraplegia 80, Autosomal Dominant
      superficial keratitis
Ankyrin And Armadillo Repeat Containing
      Cowden Syndrome
      Cowden Syndrome 1
      Hemochromatosis, Type 4
      Loeys-Dietz Syndrome
Solute Carrier Family 22 Member 6
      Acute Kidney Failure
      Fanconi Syndrome
      Fanconi-Like Syndrome
      Methotrexate Toxicity
      N-Acetylglutamate Synthase Deficiency
      Tubulointerstitial Kidney Disease, Autosomal Dominant, 1
Mitogen-Activated Protein Kinase Kinase 3
      Breast Cancer
      Cardiomyopathy, Familial Hypertrophic, 25
      Colorectal Cancer
      Cutaneous Anthra
      Inhalation Anthrax
      Parkinson Disease, Late-Onset
      Von Hippel-Lindau Syndrome
Solute Carrier Family 12 Member 4
      Agenesis Of The Corpus Callosum with Peripheral Neuropathy
      Bartter Disease
      Chronic Cervicitis
      Fish-Eye Disease
      Hemoglobin C Disease
      Hypomagnesemia 4, Renal
      Sickle Cell Disease
Pleckstrin Homology Domain Containing A7
      Blepharocheilodontic Syndrome 1
      Cleft Lip With Or Without Cleft Palate
      Glaucoma, Primary Open Angle
      Marshall Syndrome
      Nanophthalmos
      Primary Angle-Closure Glaucoma
      Renal Adenoma
      Stickler Syndrome
Zinc Finger Protein 462
      Acrofacial Dysostosis 1, Nager Type
      Craniosynostosis
      Hypermobility Syndrome
      Metopic Ridging-Ptosis-Facial Dysmorphism Syndrome
      Premature Menopause
      Ptosis
      Syndromic Intellectual Disability
      Weiss-Kruszka Syndrome
Nucleoporin 210
      Achalasia-Addisonianism-Alacrima Syndrome
      Amelogenesis Imperfecta, Type Ie 64
      Autoimmune Cholangitis
      Autoimmune Disease Of Gastrointestinal Tract
      Cholangitis
      Cholangitis, Primary Sclerosing
      Crest Syndrome
      Peliosis Hepatis
      Primary Biliary Cholangitis
HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1
      Albinism
      Chediak-Higashi Syndrome
      Hermansky-Pudlak Syndrome
      Hermansky-Pudlak Syndrome 1
      Hermansky-Pudlak Syndrome Due To Bloc-3 Deficiency
      Melanoma In Congenital Melanocytic Nevus
      Nonspecific Interstitial Pneumonia
      Oculocutaneous Albinism
      Pulmonary Fibrosis
RB Transcriptional Corepressor Like 2
      Bilateral Retinoblastoma
      Brunet-Wagner Neurodevelopmental Syndrome 6 109
      Burkitt Lymphoma
      Extraocular Retinoblastoma
      Eye Disease
      Hypoglycemia, Leucine-Induced
      Ocular Cancer
      Osteogenic Sarcoma
      Papilloma
      Retinal Cancer
      Retinoblastoma
      Spastic Paraplegia 27, Autosomal Recessive
      Spastic Paraplegia 36, Autosomal Dominant
      Unilateral Retinoblastoma
Signaling Lymphocytic Activation Molecule Family Member 1
      Dysgammaglobulinemia
      Herpangina
      Immune Deficiency Disease
      Leukemia, Acute Myeloid
      Lymphoma, Hodgkin, Classic
      Lymphoproliferative Syndrome 2
      Lymphoproliferative Syndrome
      Lymphoproliferative Syndrome, X-Linked, 1
      Lymphoproliferative Syndrome, X-Linked, 2
      Measles
      Pfeiffer Syndrome
      Postinfectious Encephalitis
      Selective Immunoglobulin Deficiency Disease
      Subacute Sclerosing Panencephalitis
      Systemic Lupus Erythematosus
      Trochlear Nerve Disease
      Viral Infectious Disease
Presenilin 2
      Acute Conjunctivitis
      Acute Hemorrhagic Conjunctivitis
      Agraphia
      Alzheimer Disease 2
      Alzheimer Disease 3
      Alzheimer Disease 4
      Alzheimer Disease, Familial, 1
      Alzheimer’S Disease 1
      Amyloidosis
      Amyotrophic Lateral Sclerosis 1
      Apperceptive Agnosia
      Basal Ganglia Calcification
      Breast Cancer
      Cardiomyopathy, Dilated, 1v
      Cerebral Amyloid Angiopathy, App-Related
      Cerebral Amyloid Angiopathy, Cst3-Related
      Cerebral Amyloid Angiopathy, Itm2b-Related
      Chromosomal Disease
      Chromosomal Duplication Syndrome
      Conjunctival Folliculosis
      Dementia
      Dementia, Lewy Body
      Dilated Cardiomyopathy
      Disease Of Mental Health
      Dyscalculia
      Early-Onset Autosomal Dominant Alzheimer Disease
      Familial Isolated Dilated Cardiomyopathy
      Frontotemporal Dementia
      Gerstmann Syndrome
      Gerstmann-Straussler Disease
      Huntington Disease-Like Syndrome
      Hyperlucent Lung
      Ideomotor Apraxia
      Leber Congenital Amaurosis 7
      Mild Cognitive Impairment
      Mitochondrial Dna Depletion Syndrome 12b
      Movement Disease
      Nervous System Disease
      Pharyngoconjunctival Fever
      Pick Disease Of Brain
      Polycystic Lipomembranous Osteodysplasia With Sclerosing Leukoencephalopathy 1
      Posterior Cortical Atrophy
      Prosopagnosia
      Shipyard Eye
      Simultanagnosia
      Speech And Communication Disorders
      Supranuclear Palsy, Progressive, 1
      Tactile Agnosia
      Visual Agnosia
Mucin 5AC, Oligomeric Mucus/Gel-Forming
      Acute Cholangitis
      Acute Dacryocystitis
      Acute Inflammation Of Lacrimal Passage
      Adenocarcinoma
      Adenoma
      Ampulla Of Vater Adenocarcinoma
      Ampulla Of Vater Cancer
      Anal Canal Adenocarcinoma
      Anal Gland Adenocarcinoma
      Androgen Insensitivity Syndrome
      Anus Adenocarcinoma
      Appendix Cancer
      Appendix Disease
      Asthma
      Atopic Keratoconjunctivitis
      Barrett Esophagus
      Bile Duct Adenocarcinoma
      Bile Duct Cancer
      Bile Duct Cystadenocarcinoma
      Bile Duct Mucinous Adenocarcinoma
      Bile Duct Mucoepidermoid Carcinoma
      Bile Reflux
      Biliary Papillomatosis
      Biliary Tract Benign Neoplasm
      Biliary Tract Disease
      Bladder Benign Neoplasm
      Blepharitis
      Breast Mucoepidermoid Carcinoma
      Bronchial Disease
      Bronchiolo-Alveolar Adenocarcinoma
      Cap Polyposis
      Cholangiocarcinoma
      Cholecystitis
      Chronic Asthma
      Chronic Conjunctivitis
      Chronic Ethmoiditis
      Colloid Carcinoma Of The Pancreas
      Colorectal Cancer
      Colorectal Cancer, Hereditary Nonpolyposis, Type 8
      Common Cold
      Complete Androgen Insensitivity Syndrome
      Conjunctival Disease
      Corneal Ulcer
      Cystadenocarcinoma
      Cystadenoma
      Cystic Fibrosis
      Cystic Teratoma
      Dacryocystitis
      Diverticulitis
      Dry Eye Syndrome
      Duodenum Adenocarcinoma
      Duodenum Cancer
      Duodenum Disease
      Endobronchial Lipoma
      Endocervical Adenocarcinoma
      Endometrial Mucinous Adenocarcinoma
      Exercise-Induced Bronchoconstriction
      Eye Disease
      Eyelid Disease
      Filamentary Keratitis
      Gastric Cancer
      Gastric Tubular Adenocarcinoma
      Inflammatory Bowel Disease
      Interstitial Lung Disease 2
      Intrahepatic Biliary Papillomatosis
      Intrahepatic Cholangiocarcinoma
      Keratoconjunctivitis Sicca
      Keratoconjunctivitis
      Lacrimal Apparatus Disease
      Limbal Stem Cell Deficiency
      Lung Cancer Susceptibility 3
      Lung Disease
      Lung Mucoepidermoid Carcinoma
      Meconium Ileus
      Microinvasive Gastric Cancer
      Middle Ear Disease
      Mucinous Adenocarcinoma
      Mucinous Cystadenocarcinoma Of Pancreas
      Mucinous Intrahepatic Cholangiocarcinoma
      Mucoepidermoid Carcinoma
      Neurotrophic Keratoconjunctivitis
      Otitis Media
      Ovarian Cancer
      Ovarian Cystadenocarcinoma
      Ovarian Mucinous Adenocarcinoma
      Ovarian Mucinous Neoplasm
      Pancreatic Cancer
      Pancreatic Ductal Carcinoma
      Pancreatic Mucinous Cystadenoma
      Pancreatic Signet Ring Cell Adenocarcinoma
      Poikiloderma With Neutropenia
      Polyposis, Skin Pigmentation, Alopecia, And Fingernail Changes
      Primary Ciliary Dyskinesia
      Pseudomyxoma Peritonei
      Pulmonary Disease, Chronic Obstructive
      Punctate Epithelial Keratoconjunctivitis
      Respiratory Allergy
      Respiratory Failure
      Senile Ectropion
      Severe Cutaneous Adverse Reaction
      Signet Ring Cell Adenocarcinoma
      Silo Filler’S Disease
      Small Intestine Adenocarcinoma
      Small Intestine Cancer
      Solid Adenocarcinoma With Mucin Production
      Status Asthmaticus
      T2-Low Asthma
      Tubular Adenocarcinoma
      Urinary Bladder Villous Adenoma
      Vernal Conjunctivitis
      Villous Adenoma

Table A2.

Associated superpathways of the identified proteins, in the order of ascending number of associated superpathways. (Information retrieved from the resources detailed in the Materials and Methods).

Superpathway
      Protein(s)
Jak-Stat Signaling Pathway
      Mitogen-Activated Protein Kinase Kinase 3
16p11.2 Proximal Deletion Syndrome
      Mitogen-Activated Protein Kinase Kinase 3
JNK (c-Jun kinases) Phosphorylation and Activation Mediated by Activated Human TAK1
      Mitogen-Activated Protein Kinase Kinase 3
4-Hydroxytamoxifen, Dexamethasone, and Retinoic Acids Regulation of p27 Expression
      Mitogen-Activated Protein Kinase Kinase 3
LKB1 Signaling Events
      Presenilin 2
ABH and Lewis Epitopes Biosynthesis from Type 1 Precursor Disaccharide
      Beta-1,3-Galactosyltransferase 5
Macrophage Differentiation and Growth Inhibition by METS
      RB Transcriptional Corepressor Like 2
Acyclovir/Ganciclovir Pathway, Pharmacokinetics/Pharmacodynamics
      Solute Carrier Family 22 Member 6
Malignant Pleural Mesothelioma
      Mitogen-Activated Protein Kinase Kinase 3
Akt Signaling
      Mitogen-Activated Protein Kinase Kinase 3
MAP Kinase Signaling
      Mitogen-Activated Protein Kinase Kinase 3
Alzheimers Disease Pathway
      Presenilin 2
MAPK Signaling Pathway
      Mitogen-Activated Protein Kinase Kinase 3
Angiopoietin-Like Protein 8 Regulatory Pathway
      Mitogen-Activated Protein Kinase Kinase 3
MAPK Signaling: Oxidative Stress
      Mitogen-Activated Protein Kinase Kinase 3
Apoptosis and Survival_Anti-Apoptotic Action of Nuclear ESR1 and ESR2
      Mitogen-Activated Protein Kinase Kinase 3
Mesodermal Commitment Pathway
      Zinc Finger Protein 462
Zidovudine Pathway, Pharmacokinetics/Pharmacodynamics
      Solute Carrier Family 22 Member 6
Methotrexate Pathway, Pharmacokinetics
      Solute Carrier Family 22 Member 6
Bacterial Infections in CF Airways
      Mitogen-Activated Protein Kinase Kinase 3
MicroRNAs in Cardiomyocyte Hypertrophy
      Mitogen-Activated Protein Kinase Kinase 3
Beta-2 Adrenergic-Dependent CFTR Expression
      Mitogen-Activated Protein Kinase Kinase 3
MIF Mediated Glucocorticoid Regulation
      Mitogen-Activated Protein Kinase Kinase 3
Blood Group Systems Biosynthesis
      Beta-1,3-Galactosyltransferase 5
Mitotic G1 Phase and G1/S Transition
      RB Transcriptional Corepressor Like 2
Canonical and Non-Canonical Notch Signaling
      Presenilin 2
Monoamine Transport
      RB Transcriptional Corepressor Like 2
Cell adhesion_Plasmin Signaling
      Mitogen-Activated Protein Kinase Kinase 3
Nanog in Mammalian ESC Pluripotency
      Mitogen-Activated Protein Kinase Kinase 3
Cell Cycle Regulation of G1/S Transition (Part 1)
      RB Transcriptional Corepressor Like 2
Nervous System Development
      Presenilin 2
Cellular Roles of Anthrax Toxin
      Mitogen-Activated Protein Kinase Kinase 3
Neuropathic Pain-Signaling in Dorsal Horn Neurons
      Mitogen-Activated Protein Kinase Kinase 3
Ceramide Pathway
      Mitogen-Activated Protein Kinase Kinase 3
Neuroscience
      Presenilin 2
CLEC7A (Dectin-1) Signaling
      Mucin 5AC, Oligomeric Mucus/Gel-Forming
NFAT and Cardiac Hypertrophy
      Mitogen-Activated Protein Kinase Kinase 3
Colorectal Cancer Metastasis
      Mitogen-Activated Protein Kinase Kinase 3
NgR-p75(NTR)-Mediated Signaling
      Rho Guanine Nucleotide Exchange Factor 4
CXCR3-Mediated Signaling Events
      Mitogen-Activated Protein Kinase Kinase 3
Non-Canonical Wnt Pathway
      Mitogen-Activated Protein Kinase Kinase 3
Death Receptor Signaling
      Mitogen-Activated Protein Kinase Kinase 3
Notch Pathway
      Presenilin 2
Dendritic Cells Developmental Lineage Pathway
      Signaling Lymphocytic Activation Molecule Family Member 1
Notch Signaling (Qiagen)
      Presenilin 2
Development A3 Receptor Signaling
      Mitogen-Activated Protein Kinase Kinase 3
Notch Signaling (WikiPathways)
      Presenilin 2
Development FGFR Signaling Pathway
      Mitogen-Activated Protein Kinase Kinase 3
Notch Signaling Pathways
      Presenilin 2
Development Notch Signaling Pathway
      Presenilin 2
NOTCH2 Activation and Transmission of Signal to the Nucleus
      Presenilin 2
Development_TGF-beta Receptor Signaling
      Mitogen-Activated Protein Kinase Kinase 3
O-linked Glycosylation of Mucins
      Mucin 5AC, Oligomeric Mucus/Gel-Forming
Diseases of Glycosylation
      Mucin 5AC, Oligomeric Mucus/Gel-Forming
p38 MAPK signaling pathway (Pathway Interaction Database)
      Mitogen-Activated Protein Kinase Kinase 3
DNA Damage
      RB Transcriptional Corepressor Like 2
P38 MAPK Signaling Pathway (sino)
      Mitogen-Activated Protein Kinase Kinase 3
Endoderm Differentiation
      Mitogen-Activated Protein Kinase Kinase 3
p70S6K Signaling
      Mitogen-Activated Protein Kinase Kinase 3
Epithelial to Mesenchymal Transition in Colorectal Cancer
      Mitogen-Activated Protein Kinase Kinase 3
Phospholipase-C Pathway
      Rho Guanine Nucleotide Exchange Factor 4
FoxO Family Signaling
      RB Transcriptional Corepressor Like 2
Physiological and Pathological Hypertrophy of the Heart
      Mitogen-Activated Protein Kinase Kinase 3
G0 and Early G1
      RB Transcriptional Corepressor Like 2
PI3K-Akt Signaling Pathway
      RB Transcriptional Corepressor Like 2
G-AlphaQ Signaling
      Rho Guanine Nucleotide Exchange Factor 4
Pre-NOTCH Expression and Processing
      Presenilin 2
Gene Silencing by RNA
      Nucleoporin 210
Presenilin-Mediated Signaling
      Presenilin 2
Glycolysis (REACTOME)
      Nucleoporin 210
Processing of Capped Intron-Containing Pre-mRNA
      Nucleoporin 210
GPER1 Signaling
      Mitogen-Activated Protein Kinase Kinase 3
Rab Regulation of Trafficking
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1
G-Protein Signaling Regulation of p38 and JNK Signaling Mediated by G-proteins
      Mitogen-Activated Protein Kinase Kinase 3
RAC1 GTPase Cycle
      Rho Guanine Nucleotide Exchange Factor 4
Guidance Cues and Growth Cone Motility
      Rho Guanine Nucleotide Exchange Factor 4
RAF/MAP Kinase Cascade
      Presenilin 2
Hematopoietic Stem Cells and Lineage-Specific Markers
      Signaling Lymphocytic Activation Molecule Family Member 1
Regulation of Actin Cytoskeleton
      Rho Guanine Nucleotide Exchange Factor 4
HIV Life Cycle
      Nucleoporin 210
Regulation of p38-alpha and p38-beta
      Mitogen-Activated Protein Kinase Kinase 3
IL-9 Signaling Pathways
      Mitogen-Activated Protein Kinase Kinase 3
Regulation of TP53 Activity
      RB Transcriptional Corepressor Like 2
Immune Response_Role of Integrins in NK Cells Cytotoxicity
      Mitogen-Activated Protein Kinase Kinase 3
Respiratory Electron Transport, ATP Synthesis by Chemiosmotic Coupling, and Heat Production by Uncoupling Proteins
      Solute Carrier Family 25 Member 27
Influenza Infection
      Nucleoporin 210
RhoA Signaling Pathway
      Mitogen-Activated Protein Kinase Kinase 3
Integrin-Mediated Cell Adhesion
      Mitogen-Activated Protein Kinase Kinase 3
RHOC GTPase Cycle
      Rho Guanine Nucleotide Exchange Factor 4
4-1BB Pathway
      Mitogen-Activated Protein Kinase Kinase 3
RhoGDI Pathway
      Rho Guanine Nucleotide Exchange Factor 4
Actin Nucleation by ARP-WASP Complex
      Rho Guanine Nucleotide Exchange Factor 4
SARS-CoV-2 Infection
      Nucleoporin 210
Alzheimer’s Disease and miRNA Effects
      Presenilin 2
Senescence and Autophagy in Cancer
      Mitogen-Activated Protein Kinase Kinase 3
Antiviral Mechanism by IFN-Stimulated Genes
      Nucleoporin 210
Serotonin HTR1 Group and FOS Pathway
      Mitogen-Activated Protein Kinase Kinase 3
B Cell Receptor Signaling Pathway
      Mitogen-Activated Protein Kinase Kinase 3
Sertoli-Sertoli Cell Junction Dynamics
      Mitogen-Activated Protein Kinase Kinase 3
Beta-Adrenergic Signaling
      Mitogen-Activated Protein Kinase Kinase 3
Signaling by ERBB4
      Presenilin 2
CCR3 Pathway in Eosinophils
      Mitogen-Activated Protein Kinase Kinase 3
Signaling by NOTCH3
      Presenilin 2
Cellular Response to Heat Stress
      Nucleoporin 210
Signaling by Receptor Tyrosine Kinases
      Presenilin 2
Chromatin Regulation/Acetylation
      RB Transcriptional Corepressor Like 2
Signaling by Rho GTPases
      Rho Guanine Nucleotide Exchange Factor 4
Constitutive Signaling by NOTCH1 HD+PEST Domain Mutants
      Presenilin 2
Signaling by Slit
      Rho Guanine Nucleotide Exchange Factor 4
Defective Binding of RB1 Mutants to E2F1,(E2F2, E2F3)
      RB Transcriptional Corepressor Like 2
Signaling Events Mediated by HDAC Class I
      Nucleoporin 210
Development Beta-Adrenergic Receptors Regulation of ERK
      Mitogen-Activated Protein Kinase Kinase 3
Signaling Events Mediated by Hepatocyte Growth Factor Receptor (c-Met)
      Rho Guanine Nucleotide Exchange Factor 4
Development VEGF signaling via VEGFR2—Generic Cascades
      Mitogen-Activated Protein Kinase Kinase 3
Signaling Events Mediated by VEGFR1 and VEGFR2
      Mitogen-Activated Protein Kinase Kinase 3
Disorders of Transmembrane Transporters
      Nucleoporin 210
Signaling Mediated by p38-gamma and p38-delta
      Mitogen-Activated Protein Kinase Kinase 3
EPH-Ephrin Signaling
      Presenilin 2
Stabilization and Expansion of the E-cadherin Adherens Junction
      Pleckstrin Homology Domain Containing A7
FOXO-mediated Transcription
      RB Transcriptional Corepressor Like 2
Statin Pathway—Generalized, Pharmacokinetics
      Solute Carrier Family 22 Member 6
GDNF-Family Ligands and Receptor Interactions
      Mitogen-Activated Protein Kinase Kinase 3
Sumoylation by RanBP2 Regulates Transcriptional Repression
      Nucleoporin 210
GPCR Downstream Signalling
      Rho Guanine Nucleotide Exchange Factor 4
superpathway of glycosphingolipids biosynthesis
      Beta-1,3-Galactosyltransferase 5
G-protein Signaling—Regulation of RAC1 Activity
      Rho Guanine Nucleotide Exchange Factor 4
Sweet Taste Signaling
      Mitogen-Activated Protein Kinase Kinase 3
HIF1Alpha Pathway
      Mitogen-Activated Protein Kinase Kinase 3
Tacrolimus/Cyclosporine Pathway, Pharmacodynamics
      Mitogen-Activated Protein Kinase Kinase 3
Immune Response Fc Epsilon RI Pathway
      Mitogen-Activated Protein Kinase Kinase 3
TCR Signaling (Qiagen)
      Mitogen-Activated Protein Kinase Kinase 3
Integrin Pathway
      Mitogen-Activated Protein Kinase Kinase 3
Tenofovir/Adefovir Pathway, Pharmacokinetics
      Solute Carrier Family 22 Member 6
A-beta Plaque Formation and APP Metabolism
      Presenilin 2
Termination of O-glycan Biosynthesis
      Mucin 5AC, Oligomeric Mucus/Gel-Forming
AMPK Enzyme Complex Pathway
      Mitogen-Activated Protein Kinase Kinase 3
TGF-beta Signaling Pathways
      Mitogen-Activated Protein Kinase Kinase 3
BAFF in B-Cell Signaling
      Mitogen-Activated Protein Kinase Kinase 3
The Fatty Acid Cycling Model
      Solute Carrier Family 25 Member 27
Cell cycle
      RB Transcriptional Corepressor Like 2
Thermogenesis
      Mitogen-Activated Protein Kinase Kinase 3
CNTF Signaling
      Mitogen-Activated Protein Kinase Kinase 3
TNF Signaling
      Mitogen-Activated Protein Kinase Kinase 3
Development A2A Receptor Signaling
      Mitogen-Activated Protein Kinase Kinase 3
TNF Superfamily—Human Ligand-Receptor Interactions and their Associated Functions
      Mitogen-Activated Protein Kinase Kinase 3
Diseases Associated with O-glycosylation of Proteins
      Mucin 5AC, Oligomeric Mucus/Gel-Forming
Toll Comparative Pathway
      Mitogen-Activated Protein Kinase Kinase 3
fMLP Pathway
      Rho Guanine Nucleotide Exchange Factor 4
Toll-Like receptor Signaling Pathways
      Mitogen-Activated Protein Kinase Kinase 3
Globo Sphingolipid Metabolism
      Beta-1,3-Galactosyltransferase 5
TP53 Regulates Transcription of Cell Cycle Genes
      RB Transcriptional Corepressor Like 2
HCMV Infection
      Nucleoporin 210
TRAF6 Mediated Induction of NFkB and MAP Kinases upon TLR7/8 or 9 Activation
      Mitogen-Activated Protein Kinase Kinase 3
Inclusion Body Myositis
      Presenilin 2
Translation Insulin Regulation of Translation
      Mitogen-Activated Protein Kinase Kinase 3
Adipogenesis
      RB Transcriptional Corepressor Like 2
Transport of Mature Transcript to Cytoplasm
      Nucleoporin 210
Breast Cancer Pathway
      Mitogen-Activated Protein Kinase Kinase 3
Transport of the SLBP Independent Mature mRNA
      Nucleoporin 210
Cytoskeleton Remodeling Regulation of Actin Cytoskeleton by Rho GTPases
      Presenilin 2
Trk Receptor Signaling Mediated by the MAPK Pathway
      Mitogen-Activated Protein Kinase Kinase 3
DNA Damage Response (Only ATM Dependent)
      RB Transcriptional Corepressor Like 2
tRNA processing
      Nucleoporin 210
G-protein Signaling RAC1 in Cellular Process
      Mitogen-Activated Protein Kinase Kinase 3
Uptake and Actions of Bacterial Toxins
      Mitogen-Activated Protein Kinase Kinase 3
Interferon Gamma Signaling
      Nucleoporin 210
Uricosurics Pathway, Pharmacodynamics
      Solute Carrier Family 22 Member 6
Cellular Senescence
      Mitogen-Activated Protein Kinase Kinase 3
VEGF Pathway (Qiagen)
      Mitogen-Activated Protein Kinase Kinase 3
G12-G13 in Cellular Signaling
      Mitogen-Activated Protein Kinase Kinase 3
VEGF Signaling Pathway
      Mitogen-Activated Protein Kinase Kinase 3
Atenolol Pathway, Pharmacokinetics
      Solute Carrier Family 22 Member 6
Vesicle-mediated Transport
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1
IL12-mediated Signaling Events
      Mitogen-Activated Protein Kinase Kinase 3
Vitamin D in Inflammatory Diseases
      Mitogen-Activated Protein Kinase Kinase 3
Development Ligand-independent Activation of ESR1 and ESR2
      Mitogen-Activated Protein Kinase Kinase 3
Wnt/Hedgehog/Notch
      Presenilin 2
MAPK-Erk Pathway
      Mitogen-Activated Protein Kinase Kinase 3
      RB Transcriptional Corepressor Like 2
Transport of Inorganic Cations/Anions and Amino Acids/Oligopeptides
      Solute Carrier Family 12 Member 4
      Solute Carrier Family 22 Member 6
IL-17 Family Signaling Pathways
      Mitogen-Activated Protein Kinase Kinase 3
      Mucin 5AC, Oligomeric Mucus/Gel-Forming
Cytokine Signaling in Immune System
      Mitogen-Activated Protein Kinase Kinase 3
      Nucleoporin 210
TGF-Beta Pathway
      Mitogen-Activated Protein Kinase Kinase 3
      Rho Guanine Nucleotide Exchange Factor 4
Signal Transduction
      Presenilin 2
      Rho Guanine Nucleotide Exchange Factor 4
Gene expression (Transcription)
      Nucleoporin 210
      RB Transcriptional Corepressor Like 2
Regulation of Activated PAK-2p34 by Proteasome Mediated Degradation
      Presenilin 2
      RB Transcriptional Corepressor Like 2
Toll-like Receptor Signaling Pathway
      Mitogen-Activated Protein Kinase Kinase 3
      Signaling Lymphocytic Activation Molecule Family Member 1
Metabolism of Proteins
      Mucin 5AC, Oligomeric Mucus/Gel-Forming
      Nucleoporin 210
Proximal Tubule Transport
      Solute Carrier Family 12 Member 4
      Solute Carrier Family 22 Member 6
Glycosaminoglycan Metabolism
      Beta-1,3-Galactosyltransferase 5
      Nucleoporin 210
CREB Pathway
      Mitogen-Activated Protein Kinase Kinase 3
      Rho Guanine Nucleotide Exchange Factor 4
Cell Cycle, Mitotic
      Nucleoporin 210
      RB Transcriptional Corepressor Like 2
Cellular Responses to Stimuli
      Mitogen-Activated Protein Kinase Kinase 3
      Nucleoporin 210
GPCR Pathway
      Mitogen-Activated Protein Kinase Kinase 3
      Rho Guanine Nucleotide Exchange Factor 4
Apoptotic Pathways in Synovial Fibroblasts
      Mitogen-Activated Protein Kinase Kinase 3
      Rho Guanine Nucleotide Exchange Factor 4
Interferon Pathway
      Mitogen-Activated Protein Kinase Kinase 3
      Rho Guanine Nucleotide Exchange Factor 4
Prolactin Signaling
      Mitogen-Activated Protein Kinase Kinase 3
      Presenilin 2
IL-1 Family Signaling Pathways
      Mitogen-Activated Protein Kinase Kinase 3
      Mucin 5AC, Oligomeric Mucus/Gel-Forming
Thyroid Stimulating Hormone (tsh) Signaling Pathway
      Mitogen-Activated Protein Kinase Kinase 3
      RB Transcriptional Corepressor Like 2
p75 NTR Receptor-Mediated Signalling
      Presenilin 2
      Rho Guanine Nucleotide Exchange Factor 4
Innate Immune System
      Mucin 5AC, Oligomeric Mucus/Gel-Forming
      Mitogen-Activated Protein Kinase Kinase 3
      Nucleoporin 210
ERK Signaling
      Presenilin 2
      Mitogen-Activated Protein Kinase Kinase 3
      Rho Guanine Nucleotide Exchange Factor 4
Metabolism
      Nucleoporin 210
      Beta-1,3-Galactosyltransferase 5
      Solute Carrier Family 25 Member 27
Disease
      Mucin 5AC, Oligomeric Mucus/Gel-Forming
      Nucleoporin 210
      Mitogen-Activated Protein Kinase Kinase 3
      Presenilin 2

Table A3.

Tissues expressing the identified proteins, in ascending order according to the total average normalized intensities. (Information retrieved from the resources detailed in the Materials and Methods).

Expressing Tissue
      Protein(s)
Total Average Normalized Intensity
Average Normalized Intensity
Cervical Mucosa 3.02
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 3.02
Osteosarcoma Cell 3.73
      Solute Carrier Family 12 Member 4 3.73
Bone 3.85
      Zinc Finger Protein 462 3.85
Oral Epithelium 4.09
      Mitogen-Activated Protein Kinase Kinase 3 4.09
Adipocyte 4.27
      Mitogen-Activated Protein Kinase Kinase 3 4.27
Uterine Cervix 4.42
      Mitogen-Activated Protein Kinase Kinase 3 4.42
Uterus 4.67
      Mitogen-Activated Protein Kinase Kinase 3 4.67
Skin 5.31
      Mitogen-Activated Protein Kinase Kinase 3 5.31
Prefrontal Cortex 8.39
      Nucleoporin 210 3.47
      Solute Carrier Family 25 Member 27 4.92
Breast 9.12
      Mitogen-Activated Protein Kinase Kinase 3 4.77
      Nucleoporin 210 4.35
Spermatozoon 9.98
      Nucleoporin 210 5.64
      RB Transcriptional Corepressor Like 2 4.34
Cardia 11.24
      Mitogen-Activated Protein Kinase Kinase 3 5.31
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 5.93
Spinal Cord 13.50
      Mitogen-Activated Protein Kinase Kinase 3 3.99
      Nucleoporin 210 3.47
      Pleckstrin Homology Domain Containing A7 3.02
      Rho Guanine Nucleotide Exchange Factor 4 3.02
Natural Killer Cell 13.58
      Mitogen-Activated Protein Kinase Kinase 3 5.29
      Nucleoporin 210 5.41
      RB Transcriptional Corepressor Like 2 2.88
Gut 17.30
      Mitogen-Activated Protein Kinase Kinase 3 4.10
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 5.55
      Nucleoporin 210 4.58
      Pleckstrin Homology Domain Containing A7 3.07
Monocyte 17.99
      Mitogen-Activated Protein Kinase Kinase 3 5.42
      Nucleoporin 210 5.45
      RB Transcriptional Corepressor Like 2 3.62
      Solute Carrier Family 12 Member 4 3.50
Pancreatic Islet 18.45
      Mitogen-Activated Protein Kinase Kinase 3 4.85
      Nucleoporin 210 4.89
      Pleckstrin Homology Domain Containing A7 4.35
      Solute Carrier Family 12 Member 4 4.37
Blood Platelet 20.71
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 4.15
      Mitogen-Activated Protein Kinase Kinase 3 5.04
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 1.82
      Nucleoporin 210 2.14
      Ring Finger Protein 10 2.66
      Solute Carrier Family 12 Member 4 2.52
      Zinc Finger Protein 462 2.38
Helper T-Lymphocyte 22.29
      Mitogen-Activated Protein Kinase Kinase 3 5.33
      Nucleoporin 210 5.71
      RB Transcriptional Corepressor Like 2 3.67
      Signaling Lymphocytic Activation Molecule Family Member 1 4.33
      Zinc Finger Protein 462 3.25
Heart 22.30
      Mitogen-Activated Protein Kinase Kinase 3 4.45
      Nucleoporin 210 4.03
      Pleckstrin Homology Domain Containing A7 4.64
      RB Transcriptional Corepressor Like 2 2.84
      Solute Carrier Family 12 Member 4 3.75
      Solute Carrier Family 25 Member 27 2.60
Colonic Epithelial Cell 23.36
      Beta-1,3-Galactosyltransferase 5 5.33
      Mitogen-Activated Protein Kinase Kinase 3 4.61
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 3.57
      Nucleoporin 210 5.36
      Solute Carrier Family 25 Member 27 4.50
Ovary 23.41
      Mitogen-Activated Protein Kinase Kinase 3 4.14
      Nucleoporin 210 4.88
      Pleckstrin Homology Domain Containing A7 5.25
      RB Transcriptional Corepressor Like 2 3.16
      Solute Carrier Family 12 Member 4 3.73
      Zinc Finger Protein 462 2.25
Urinary Bladder 23.79
      Mitogen-Activated Protein Kinase Kinase 3 4.68
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 3.03
      Nucleoporin 210 3.93
      Pleckstrin Homology Domain Containing A7 4.16
      RB Transcriptional Corepressor Like 2 3.60
      Solute Carrier Family 12 Member 4 4.39
B-lymphocyte 23.82
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 3.49
      Mitogen-Activated Protein Kinase Kinase 3 5.74
      Nucleoporin 210 5.55
      RB Transcriptional Corepressor Like 2 4.47
      Signaling Lymphocytic Activation Molecule Family Member 1 4.57
Cytotoxic T-lymphocyte 24.32
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 3.80
      Mitogen-Activated Protein Kinase Kinase 3 5.66
      Nucleoporin 210 5.72
      RB Transcriptional Corepressor Like 2 4.47
      Signaling Lymphocytic Activation Molecule Family Member 1 4.66
Kidney 24.46
      Mitogen-Activated Protein Kinase Kinase 3 4.00
      Nucleoporin 210 3.89
      Pleckstrin Homology Domain Containing A7 3.83
      RB Transcriptional Corepressor Like 2 3.64
      Solute Carrier Family 12 Member 4 4.06
      Solute Carrier Family 22 Member 6 5.03
Myometrium 25.05
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 4.53
      Mitogen-Activated Protein Kinase Kinase 3 4.07
      RB Transcriptional Corepressor Like 2 3.11
      Ring Finger Protein 10 3.69
      Solute Carrier Family 12 Member 4 3.79
      Solute Carrier Family 25 Member 27 5.85
Retina 25.10
      Mitogen-Activated Protein Kinase Kinase 3 4.79
      Nucleoporin 210 4.99
      Pleckstrin Homology Domain Containing A7 4.27
      Solute Carrier Family 12 Member 4 3.17
      Solute Carrier Family 25 Member 27 4.17
      Zinc Finger Protein 462 3.70
Lymph node 25.12
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 2.76
      Mitogen-Activated Protein Kinase Kinase 3 5.21
      Nucleoporin 210 5.09
      RB Transcriptional Corepressor Like 2 4.04
      Signaling Lymphocytic Activation Molecule Family Member 1 4.53
      Solute Carrier Family 12 Member 4 3.49
Esophagus 27.07
      Mitogen-Activated Protein Kinase Kinase 3 4.47
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 2.89
      Nucleoporin 210 3.93
      Pleckstrin Homology Domain Containing A7 2.84
      RB Transcriptional Corepressor Like 2 4.78
      Signaling Lymphocytic Activation Molecule Family Member 1 3.38
      Solute Carrier Family 12 Member 4 4.79
Liver 27.72
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 3.66
      Mitogen-Activated Protein Kinase Kinase 3 4.67
      Nucleoporin 210 4.52
      Pleckstrin Homology Domain Containing A7 4.28
      RB Transcriptional Corepressor Like 2 3.66
      Ring Finger Protein 10 3.12
      Solute Carrier Family 12 Member 4 3.81
Salivary Gland 30.07
      Mitogen-Activated Protein Kinase Kinase 3 5.17
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 2.56
      Nucleoporin 210 4.00
      Pleckstrin Homology Domain Containing A7 4.48
      Presenilin 2 3.15
      RB Transcriptional Corepressor Like 2 3.38
      Solute Carrier Family 12 Member 4 4.17
      Zinc Finger Protein 462 3.17
Spleen 31.04
      Mitogen-Activated Protein Kinase Kinase 3 4.91
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 2.14
      Nucleoporin 210 4.15
      Pleckstrin Homology Domain Containing A7 2.72
      Presenilin 2 3.78
      RB Transcriptional Corepressor Like 2 4.72
      Signaling Lymphocytic Activation Molecule Family Member 1 4.41
      Solute Carrier Family 12 Member 4 4.19
Adrenal Gland 32.13
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 3.69
      Mitogen-Activated Protein Kinase Kinase 3 4.85
      Nucleoporin 210 4.26
      Pleckstrin Homology Domain Containing A7 3.41
      Presenilin 2 3.96
      RB Transcriptional Corepressor Like 2 3.86
      Solute Carrier Family 12 Member 4 4.82
      Zinc Finger Protein 462 3.28
Thyroid Gland 32.46
      Beta-1,3-Galactosyltransferase 5 3.50
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 3.90
      Mitogen-Activated Protein Kinase Kinase 3 4.65
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 2.53
      Nucleoporin 210 4.68
      Pleckstrin Homology Domain Containing A7 4.45
      RB Transcriptional Corepressor Like 2 3.89
      Solute Carrier Family 12 Member 4 4.85
Placenta 32.78
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 3.94
      Mitogen-Activated Protein Kinase Kinase 3 5.03
      Nucleoporin 210 4.48
      Pleckstrin Homology Domain Containing A7 4.47
      RB Transcriptional Corepressor Like 2 3.52
      Ring Finger Protein 10 3.46
      Solute Carrier Family 12 Member 4 5.26
      Zinc Finger Protein 462 2.63
Prostate Gland 33.04
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 4.16
      Mitogen-Activated Protein Kinase Kinase 3 4.49
      Nucleoporin 210 4.40
      Pleckstrin Homology Domain Containing A7 4.37
      Presenilin 2 4.24
      RB Transcriptional Corepressor Like 2 3.92
      Solute Carrier Family 12 Member 4 4.48
      Zinc Finger Protein 462 2.99
Testis 33.68
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 3.25
      Mitogen-Activated Protein Kinase Kinase 3 4.51
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 2.54
      Nucleoporin 210 4.79
      Pleckstrin Homology Domain Containing A7 3.37
      Presenilin 2 4.11
      RB Transcriptional Corepressor Like 2 3.57
      Solute Carrier Family 12 Member 4 4.19
      Zinc Finger Protein 462 3.35
Stomach 33.79
      Beta-1,3-Galactosyltransferase 5 3.44
      Mitogen-Activated Protein Kinase Kinase 3 5.02
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 6.17
      Nucleoporin 210 4.05
      Pleckstrin Homology Domain Containing A7 4.06
      RB Transcriptional Corepressor Like 2 3.11
      Signaling Lymphocytic Activation Molecule Family Member 1 3.85
      Solute Carrier Family 12 Member 4 4.09
Brain 37.57
      Mitogen-Activated Protein Kinase Kinase 3 3.85
      Nucleoporin 210 4.39
      Pleckstrin Homology Domain Containing A7 4.38
      Presenilin 2 3.24
      RB Transcriptional Corepressor Like 2 4.59
      Rho Guanine Nucleotide Exchange Factor 4 4.82
      Solute Carrier Family 12 Member 4 4.88
      Solute Carrier Family 25 Member 27 4.11
      Zinc Finger Protein 462 3.31
Rectum 37.68
      Beta-1,3-Galactosyltransferase 5 4.68
      Mitogen-Activated Protein Kinase Kinase 3 4.83
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 3.33
      Nucleoporin 210 4.83
      Pleckstrin Homology Domain Containing A7 3.69
      RB Transcriptional Corepressor Like 2 4.75
      Solute Carrier Family 12 Member 4 3.74
      Solute Carrier Family 25 Member 27 5.41
      Zinc Finger Protein 462 2.42
Breast Cancer Cell 37.87
      Mitogen-Activated Protein Kinase Kinase 3 4.93
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 5.99
      Nucleoporin 210 5.44
      Pleckstrin Homology Domain Containing A7 3.46
      Presenilin 2 3.46
      RB Transcriptional Corepressor Like 2 3.27
      Solute Carrier Family 12 Member 4 4.12
      Solute Carrier Family 22 Member 6 4.15
      Zinc Finger Protein 462 3.04
Colon 39.21
      Beta-1,3-Galactosyltransferase 5 4.41
      Mitogen-Activated Protein Kinase Kinase 3 4.96
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 4.38
      Nucleoporin 210 4.74
      Pleckstrin Homology Domain Containing A7 4.87
      RB Transcriptional Corepressor Like 2 4.10
      Solute Carrier Family 12 Member 4 3.99
      Solute Carrier Family 25 Member 27 4.90
      Zinc Finger Protein 462 2.87
Tonsil 39.26
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 3.07
      Mitogen-Activated Protein Kinase Kinase 3 5.31
      Nucleoporin 210 4.11
      Pleckstrin Homology Domain Containing A7 4.69
      RB Transcriptional Corepressor Like 2 4.31
      Rho Guanine Nucleotide Exchange Factor 4 2.74
      Ring Finger Protein 10 2.58
      Signaling Lymphocytic Activation Molecule Family Member 1 4.52
      Solute Carrier Family 12 Member 4 3.92
      Zinc Finger Protein 462 4.01
Pancreas 39.33
      Beta-1,3-Galactosyltransferase 5 3.69
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 3.31
      Mitogen-Activated Protein Kinase Kinase 3 4.64
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 3.80
      Nucleoporin 210 3.84
      Pleckstrin Homology Domain Containing A7 4.94
      Presenilin 2 3.86
      RB Transcriptional Corepressor Like 2 3.44
      Rho Guanine Nucleotide Exchange Factor 4 3.39
      Solute Carrier Family 12 Member 4 4.43
Gall Bladder 39.61
      Beta-1,3-Galactosyltransferase 5 4.49
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 3.52
      Mitogen-Activated Protein Kinase Kinase 3 5.08
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 5.15
      Nucleoporin 210 4.40
      Pleckstrin Homology Domain Containing A7 4.25
      Presenilin 2 3.38
      RB Transcriptional Corepressor Like 2 4.87
      Solute Carrier Family 12 Member 4 4.46
Lung 39.90
      HPS1 Biogenesis Of Lysosomal Organelles Complex 3 Subunit 1 4.18
      Mitogen-Activated Protein Kinase Kinase 3 4.48
      Mucin 5AC, Oligomeric Mucus/Gel-Forming 3.98
      Nucleoporin 210 3.91
      Pleckstrin Homology Domain Containing A7 3.53
      Presenilin 2 3.85
      RB Transcriptional Corepressor Like 2 4.39
      Signaling Lymphocytic Activation Molecule Family Member 1 4.04
      Solute Carrier Family 12 Member 4 3.71
      Zinc Finger Protein 462 3.84
General Sum 1060.88

Author Contributions

Conceptualization, Y.S.; methodology, Y.A.; writing—original draft preparation, Y.A.; writing—review and editing, Y.S.; supervision, Y.S. All authors have read and agreed to the published version of the manuscript.

Data Availability Statement

Data is contained within the article or supplementary materials.

Conflicts of Interest

The authors declare no conflict of interest.

Funding Statement

This research received no external funding.

Footnotes

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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