Abstract
A compendium is presented of inherited monogenic disorders that have a prevalence of >1:20,000 in the human population, along with their causative genes and encoded proteins. “Simple” monogenic diseases are those for which the clinical features are caused by mutations impacting a single gene, usually in a manner that alters the sequence of the encoded protein. Of course, for a given “monogenic disorder”, there is sometimes more than one potential disease gene, mutations in any one of which is sufficient to cause phenotypes of that disorder. Disease‐causing mutations for monogenic disorders are usually passed on from generation to generation in a Mendelian fashion, and originate from spontaneous (de novo) germline founder mutations. In the past monogenic disorders have often been written off as targets for drug discovery because they sometimes are assumed to be rare disorders, for which the meager projected financial payoff of drug discovery and development has discouraged investment. However, not all monogenic diseases are rare. Here, we report that that currently available data identifies 72 disorders with a prevalence of at least 1 in 20,000 humans. For each, we tabulate the gene(s) for which mutations cause the spectrum of phenotypes associated with that disorder. We also identify the gene and protein that most commonly causes each disease. 34 of these disorders are caused exclusively by mutations in only a single gene and encoded protein.
Keywords: diseases, disorders, genes, genetic, inherited, Mendelian, monogenic, mutations, proteins, rare
1. INTRODUCTION
As recently as the early‐1980s there were only a handful of heritable human genetic disorders for which the causative mutated gene and its encoded protein were clearly identified. 1 However, since then a series of advances have led to the identification of hundreds of thousands of disease‐causing gene mutations (http://www.hgmd.cf.ac.uk/ac/stats.php), each one of which is sufficient to cause one of the roughly 7000 known human disorders that exhibit Mendelian inheritance patterns. 2 , 3 , 4 This astounding progress provides the basis for unraveling the molecular mechanisms underlying each disorder as well as for the rational development of therapeutics that address the molecular defect(s) that result from each gene mutation. 5 Most often, disease mutations encode either a point mutation in a protein or truncation of a protein's sequence. 6 This can result in full or partial loss of function for that protein, dysregulated function, inappropriate gain or loss of interactions with other biomolecules, and/or toxicity caused by formation of aggregates, amyloid, or other nonnative forms. The simplicity of the genotype–phenotype relationship for inherited monogenic disorders distinguished these diseases from complex disorders caused by multiple factors as well as from diseases that are caused by noninherited mutations that initially occur in single somatic (nongermline) cells, such as many forms of cancer. 7 , 8 , 9 , 10
Progress in translating knowledge of the genetic basis for monogenic disorders into therapeutic discovery and development has been hindered by a perception that monogenic disorders usually are rare, 11 , 12 in which case the enormous expenditures typically required to successfully develop a drug and then navigate it through the requisite regulatory approval process may not be recouped by income that eventually derives from marketing that drug. 13 , 14 Fortunately, this dire assessment does not extend to all Mendelian disorders, as exemplified by the recent and successful completion of efforts to develop profitable drugs that are effective in treating the most common phenotype of cystic fibrosis (CF, afflicting 1:13,000 people), offering patients—for the first time—the realistic hope of a near‐normal life span. 15 , 16 These CF drugs address both the mistrafficking and dysfunction of the ΔF508 mutant form of the cystic fibrosis transmembrane regulator chloride channel, which causes the form of the disease shared by 90% of patients.
1.1. Compilation of a compendium of common inherited human diseases
In considering how to assess drug discovery opportunities provided by the current genetic databases for inherited disease we found that there is no well‐curated published compilation of the most common genetic diseases that also provides information regarding which genes and their associated proteins are mutated to cause these disorders. We therefore undertook such a compilation by mining the now‐extensive information available in the literature and from various genetics/disease data depositories. Among the latter, a 2020 report published on‐line by ORPHANET—https://www.orpha.net/orphacom/cahiers/docs/GB/Prevalence_of_rare_diseases_by_alphabetical_list.pdf—was particularly useful for its up‐to‐date disease prevalence data for inherited and other rare diseases. 17 , 18 We extracted the list of all human disorders from OPHANET that are known to have a prevalence of >5 people in 100,000 (1:20,000 or higher). We then excluded from the list all those disorders that do not include monogenic forms that exhibit >1:20,000 prevalence. This includes many disorders caused by immune system dysfunction or other nongenetic mechanisms. Also excluded were complex (multi‐factorial) disorders such as type II diabetes, and diseases such as Alzheimer's, 19 Parkinson's, 20 and hypothyroidism, 21 where the etiology of the most common forms of that disorder do not have a simple monogenic origin and the inherited phenotypes are more rare than 1:20,000. Also excluded are the many disorders that are caused mainly by structural changes in the genome, which usually results in gene duplications or deletions, often for multiple genes. Finally, because the ORPHANET report does not actually include the most common monogenic disorders (those not classified as “rare”, such as hypercholesterolemia) we also completed a search to ensure that these were included in our tabulation.
For each monogenic disorder we then conducted searches of a variety of databases (ORPHANET, OMIM, GRAD, PubMed, and GeneReview 22 , 23 , 24 , 25 , 26 ) to identify the gene or genes for which mutations cause that disorder. For each disease‐causative gene we then used UNIPROT 27 to identify the encoded protein. The number of known disease‐causing missense or nonsense mutations that impact the sequence or length of each encoded protein was usually estimated from the “Professional” version of Human Gene Mutation Database (HGMD), 28 except for disorders where literature searches identified additional mutations not yet logged into HGMD. This process led to the compendium in Table 1. For each gene we also tabulated how many different nonsense and missense mutations located in that gene's protein open reading frame are known to be disease‐causing.
TABLE 1.
Compendium of the known >1:20,000 human monogenic disorders and their causative genes and encoded proteins as of mid‐2021
| ORPHA‐NET # | Disease or group of diseases | Prevalence (per 100,000) a , b | Mode of inheritance c | Known causative genes | Majority gene (with # of causative nonsense/mis‐sense mutations) | Encoded protein name | UNIPROT number | Protein class | % cases caused by majority gene | References |
|---|---|---|---|---|---|---|---|---|---|---|
| 90,794 | Adrenal hyperplasia due to 21‐hydroxylase deficiency (21‐OHD CAH) | 7.0 | Recessive | CYP21A2 | CYP21A2 (196) | Cytochrome P450 family 21 subfamily A member 2 | P08686 | Enzyme | 100% | 45, 46, 47, 48, 49 |
| 51 | Aicardi‐Goutières syndrome encephalopathy | 10.0* | Recessive | ADAR; IFIH1; RNASEH2A; RNASEH2B; RNASEH2C; SAMHD1; TREX1 | RNASEH2B (28) | Ribonuclease H2 subunit B | Q5TBB1 | Enzyme | 36% | 50, 51 |
| 60 | Alpha‐1‐antitrypsin (A1AT) deficiency (AATD) | 20.0* | Recessive | SERPINA1 | SERPINA1 (83) | Serpin family A member 1 | P01009 | Enzyme inhibitor | 100% | 52, 53 |
| 247 | Arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC, ARVD) | 20.0 | Dominant or recessive | 13 different genes linked to this disorder, so far. | PKP2 (138) | Plakophilin 2 | Q99959 | Adhesion protein in junctions and intermediate filaments. | 34%–74% | 54 |
| 730 | Autosomal dominant polycystic kidney disease (ADPKD) | 39.6* | Dominant | BICC1; GANAB; PKD1; PKD2 | PKD1 (1154) | Polycystin 1 | P98161 | Subunit of ion channel complex | 78% | 55 |
| 130 | Brugada syndrome ventricular fibrillation | 20.0* | Dominant | 22 different genes linked to this disorder, so far | SCN5A (725) | Sodium voltage‐gated channel alpha subunit 5 | Q14524 | Ion channel | 15–30% | 56, 57 |
| 3,286 | Catecholaminergic polymorphic ventricular tachycardia (CPVT) | 10.0* | Dominant | CALM1; CALM2; CALM3; CASQ2; RYR2; TECRL; TRDN | RYR2 (288) | Ryanodine receptor 2 | Q92736 | Ion channel | 55% | 58, 59 |
| 166 | Charcot–Marie‐Tooth d disease/Hereditary motor and sensory neuropathy | 40.0* | Dominant, recessive or X‐linked | 75 different genes linked to this disorder, so far. | PMP22 (63) | Peripheral myelin protein 22 d | Q01453 | Ill‐defined role in myelin and Schwann cells | 79% | |
| 418 | Congenital adrenal hyperplasia (CAH) | 10.0*, 6.7 (BP)* | Recessive | CYP11B1; CYP17A1; CYP21A2; HSD3B2; POR; STAR | CYP21A2 (214) | Cytochrome P450 family 21 subfamily A member 2 | P08686 | Enzyme | 95–99% | 46, 47 |
| 35,122 | Congenital sucrase‐isomaltase deficiency (CSID) | 20.0* | Recessive | SI | SI (23) | Sucrase‐isomaltase | P14410 | Enzyme | 100% | 65, 66 |
| 48 | Congenital bilateral absence of vas deferens | 50.0* | Recessive | CFTR; ADGRG2 | CFTR (120) | Cystic fibrosis transmembrane conductance regulator | Q20BH0 | Ion channel | 78% | 67 |
| 586 | Cystic fibrosis | 7.4* | Recessive | CFTR; CLCA4; DCTN4; STX1A; TGFB1 | CFTR (1053) | Cystic fibrosis transmembrane conductance regulator | Q20BH0 | Ion channel | 100% | 15, 16, 68 |
| 214 | Cystinuria‐lysinuria syndrome/Cystinuria | 14.0 | Recessive | SLC3A1; SLC7A9 | SLC7A9 (83) | Solute carrier family 7 member 9 | P82251 | Membrane transporter | 53.00% | 69, 70, 71 |
| 95,702 | Cytomegalic congenital adrenal hypoplasia (AHC) (subtype of congenital adrenal hypoplasia) | 8.0 | X‐linked | NR0B1 | NR0B1 (112) | Nuclear receptor subfamily 0 group B member 1 | P51843 | Nuclear receptor | 100% | 72 |
| 49,042 | Dentinogenesis imperfecta (DGI) (all types) | 14.5* | Dominant | DSPP | DSPP (11) | Dentin sialophospho‐protein | Q9NZW4 | Seeds biomineral‐ization, Dentinogenesis | 100% | 73, 74 |
| 98,896 | Duchenne muscular dystrophy (DMD) | 15.1* (BP) | X‐linked | DMD; LTBP4 | DMD (830) | Dystrophin | P11532 | Structural protein | 100% | 75, 76 |
| 412 | Dysbetalipoproteinemia/Hyperliproteinemia type 3 | 10.0 | Recessive | APOE | APOE (42) | Apolipoprotein E | P02649 | Lipid carrier, lipoprotein | 100% | 77 |
| 287 | Ehlers‐Danlos syndrome | 12.5* | Dominant | COL1A1; COL5A1; COL5A2 | COL5A1 (106) | Collagen type V alpha 1 chain, collagen type V alpha 2 chain | P20908, P05997 | Structural protein | 75–78% | 78, 79, 80 |
| 733 | Familial adenomatous polyposis (FAP) | 6.0* | Dominant | APC; MUTYH | APC (539) | Adenomatous polyposis coli protein | P25054 | Tumor suppressor, regulatory protein | 70% | 81, 82, 83, 84, 85 |
| 79,665 | Gardner syndrome (subtype of familial adenomatous polyposis) | 9.1 (BP) | Dominant | APC | APC (539) | Adenomatous polyposis coli protein | P25054 | Tumor suppressor, associated with microtublules | 100% | 81 |
| 221,061 | Familial cerebral cavernous malformation | 15.0 | Dominant | CCM2; KRIT1; PDCD10 | KRIT1 (80) | Krev interaction trapped protein 1 | O00522 | Regulatory protein | 53% | 86, 87, 88, 89, 90, 91, 92, 93 |
| 93,372 | Familial hypocalciuric hypercalcemia type 1 (FHH) | 5.5 | Dominant | CASR | CASR (373) | Calcium sensing receptor | P41180 | G protein‐coupled receptor | 100% | 94, 95 |
| No entry | Famililal hypercholesterolemia | 400.0 | Dominant | APOB; LDLR; LDLRAP1; PCSK | LDLR (1254) | Low density lipoprotein receptor | P01130 | Lipoprotein receptor | 60–80% | 96, 97 |
| 154 | Familial isolated dilated cardiomyopathy | 17.5* | Dominant (most often) or X‐linked | 45 different genes linked to this disorder, so far. | TTN (672) | Titin | Q8WZ42 | Muscle protein | 25% | 98, 99 |
| 768 | Familial long QT syndrome (LQTS), including Romano‐Ward syndrome | 40.0* | Dominant (most often) or recessive | 19 different genes linked to this disorder, so far. | KCNQ1 (448) | Potassium voltage‐gated channel subfamily Q member 1 | P51787 | Ion Channel | 50% | 37, 100, 101, 102 |
| 908 | Fragile X syndrome/Martin‐bell syndrome | 32.5 | X‐linked | FMR1 | FMR1 (7) | Fragile X mental retardation 1 | Q06787 | Regulator of mRNA biology | 100% | 103, 104 |
| No entry | Glucose‐6‐phosphate dehydrogenase deficiency | 5,000 | X‐linked | G6PD | G6PD (218) | Glucose‐6‐phosphate 1 dehydrogenase | P11413 | Enzyme | 100% | 105 |
| 79,201 | Glycogen storage disease | 10.0 | Recessive | 27 different genes linked to this disorder, so far. | AGL (117) | Glycogen debranching enzyme | P35573 | Enzyme | 25% | 106 |
| 309,152 | GM2 gangliosidosis | 5.0* | Recessive | GM2A; HEXA; HEXB | HEXA (124) | Hexosaminidase subunit alpha | P06865 | Enzyme | 73% | 107, 108, 109, 110 |
| 220,489 | Hemochromatosis | 500 | Dominant or recessive | BMP6; HAMP; HFE; HJV; SLC40A1; TFR2 | HFE (43) | Hereditary hemochromatosis protein | Q30201 | Binds transferrin receptor | 85–90% | 111 |
| 766 | Hemolytic anemia due to red cell pyruvate kinase deficiency | 5.0* | Recessive | PKLR | PKLR (237) | Pyruvate kinase | P30613 | Enzyme | 100% | 112, 113 |
| 448 | Hemophilia A and B | 7.7* | X‐linked | F8; F9 | F8 (1898) | Coagulation factor VIII | P00451 | Cofactor for factor IXa | 80% | 114, 115, 116 |
| 98,878 | Hemophilia A | 11.25 (BP) | X‐linked | F8 | F8 (3364) | Coagulation factor VIII | P00451 | Cofactor for factor IXa | 100% | 114, 115, 116 |
| 774 | Hemorrhagic telangiectasia/Osler Weder Rendu disease | 16.0* | Dominant | ACVRL1; ENG; GDF2; SMAD4 | ENG (187) | Endoglin | P17813 | Regulation of angiogenesis | 35% | 117, 118, 119, 120 |
| 91,378 | Hereditary angioedema (HAE)/Angioneurotic edema | 5.0* | Dominant | ANGPT1; F12; PLG; SERPING1 | SERPING1 (252) | Serpin family G member 1 | P05155 | Enzyme inhibitor | 95% | 121 |
| 145 | Hereditary breast and ovarian cancer syndrome | 25* | Dominant | 14 different genes linked to this disorder so far. | BRCA1 (1262) | Breast cancer type 1 susceptibility protein | P38398 | E3 ubiquitin‐protein ligase | ~66% | 122 |
| 469 | Hereditary fructose intolerance/Fructosemia | 5.0* | Recessive | ALDOB | ALDOB (32) | Aldolase, fructose‐bisphosphate B | P05062 | Enzyme | 100% | 123 |
| 3,467 | Hereditary xanthinuria/Xanthine stone disease | 9.05* (I) | Recessive | MOCOS; XDH | MOCOS (8); XDH (17) | Molybdenum cofactor sulfurase, xanthine dehydrogenase | Q9C5X8, P47989 | Enzymes | MOCOS and XCH cause 100%, but relative contributions not yet known | 124 |
| 238,468 | Hypohidrotic ectodermal dysplasia (HED) | 6.7* | X‐linked | 10 different genes linked to this disorder, so far. | EDA (199) | Ectodysplasin A | Q92838 | Cytokine | 65–75% | 125, 126, 127, 128, 129, 130, 131, 132 |
| 42,062 | Iminoglycinuria | 6.68* | Recessive | SLC36A2; SLC6A18; SLC6A19; SLC6A20 | SLC36A2 (1) | Solute carrier family 36 member 2 | Q495M3 | Membrane transporter | 100% | 133 |
| 524 | Li‐Fraumeni syndrome sarcoma, breast, leukemia, and adrenal gland (SBLA) syndrome | 6.0 | Dominant | CDKN2A; CHEK2; MDM2; TP53 | TP53 (417) | Tumor protein p53 | P04637 | Tumor suppressor, gene regulation | 91% | 134 |
| 5 | Long chain 3‐hydroxyacyl‐CoA dehydrogenase deficiency (LCHAD) | 8.0* | Recessive | HADHA | HADHA (35) | Hydroxyacyl‐CoA dehydrogenase trifunctional multienzyme complex subunit alpha | P40939 | Enzyme | 100% | 135 |
| 144 | Lynch syndrome | 125 | Dominant | 11 different genes linked to this disorder so far | MSH2 (34) | DNA mismatch repair protein Msh2 | P43246 | DNA repair, binds DNA, ATPase | 20–40% | 136 |
| 558 | Marfan syndrome | 15.0 | Dominant | FBN1; TGFBR2 | FBN1 (1893) | Fibrillin 1 | P35555 | Structural protein, extracellular matrix | 90% | 137, 138, 139 |
| 2,209 | Maternal phenylketonuria/Phenylketonuric embryopathy | 10.0* (I) | Recessive | PAH | PAH (690) | Phenylalanine hydroxylase | P00439 | Enzyme | 100% | 140 |
| 42 | Medium chain acyl‐CoA dehydrogenase deficiency (MCADD) | 6.85, 12.0* | Recessive | ACADM | ACADM (136) | Acyl‐CoA dehydrogenase medium chain | P11310 | Enzyme | 100% | 141 |
| 423,461 | Mucolipidosis type III (ML3) alpha/beta | 13.0 | Recessive | GNPTAB | GNPTAB (68) | N‐acetylglucosamine 1 phosphate transferase, Subunits alpha and beta | Q3T906 | Enzyme | 100% | 142 |
| 309,297 | Mucopolysaccharidosis type 4A (MPS4A)/Morquio disease type A | 15.0* | Recessive | GALNS | GALNS (269) | Galactosamine (N‐acetyl)‐6‐sulfatase | P34059 | Enzyme | 100% | 143 |
| 653 | Multiple endocrine neoplasia type 2 | 7 | Dominant | RET | RET (130) | Ret proto‐oncogene receptor tyrosine kinase | P07949 | Receptor tyrosine kinase | 100% | 144 |
| 251 | Multiple epiphyseal dysplasia (MED) | 5.0* | Dominant (most often) or recessive | COL2A1; COL9A1; COL9A2; COL9A3/collagen type IX alpha 3 chain; COMP; KIF7; MATN3; SLC26A2 | COMP (155) | Cartilage oligomeric matrix protein | P49747 | Structural protein | 81–87% | 145, 146, 147, 148 |
| 636 | Neurofibromatosis type 1 (NF1)/Von Recklinghausen disease | 21.3*, 33.3 | Dominant | NF1 | NF1 (1208) | Neurofibromin 1 | P21359 | Regulator of Ras GTPase activity | 100% | 149 |
| 55 | Oculocutaneous albinism (OCA) | 5.9 | Recessive | LRMDA; MC1R; OCA2; SLC24A5; SLC45A2; TYR; TYRP1 | TYR (352) | Tyrosinase | P14679 | Enzyme | 50% | 150, 151, 152, 153 |
| 666 | Osteogenesis imperfecta/brittle bone disease | 10.0* | Dominant | 15 different genes linked to this disorder, so far. | COL1A1 (547); COL1A2 (466) | Collagen type I alpha 1 chain, collagen type I alpha 2 chain | P02452, P08123 | Structural protein | 85–90% | 154, 155, 156, 157 |
| 705 | Pendred syndrome (PDS)/Deafness with goiter | 7.0* | Recessive | FOXI1; KCNJ10; SLC26A4 | SLC26A4 (404) | Solute carrier family 26 member 4 | O43511 | Membrane transporter | 90% | 158, 159, 160, 161, 162, 163, 164, 165, 166 |
| 716 | Phenylketonuria (PKU)/Phenylalanine hydroxylase deficiency (PAH deficiency) | 10.0* | Recessive | PAH | PAH (690) | Phenylalanine hydroxylase | P00439 | Enzyme | 100% | 167 |
| 70 | Proximal spinal muscular atrophy (SMA) | 20.0* | Recessive | NAIP; SMN1; SMN2 | SMN1 (47) | Survival motor neuron protein | Q16637 | RNA splicing | ~100% | 168, 169, 170, 171, 172, 173, 174, 175 |
| 791 | Retinitis Pigmentosa (RP) | 26.7 | Dominant (most often), recessive or X‐linked | 82 different genes linked to this disorder, so far. | RHO (204) | Rhodopsin | P08100 | G‐protein coupled receptor | 20–30% autosomal dominant (15%–25% of total cases) | 176, 177, 178, 179 |
| 461 | Recessive X‐linked ichthyosis (XLI) | 16.6* | X‐linked | STS | STS (28) | Steroid sulfatase | P08842 | Enzyme | 100% | 180 |
| 790 | Retinoblastoma (RB bilateral (40% of cases) and unilateral (60% of cases—de novo mutation) | 6.0 | Dominant | NMYC; RB1 | RB1 (292) | RB transcriptional corepressor 1 | P06400 | Tumor suppressor, cell cycle regulation | 98% | 181 |
| 778 | Rett syndrome | 10.0* | X‐linked | MECP2 | MECP2 (246) | Methyl‐CpG binding protein 2 | P51608 | Binds to methylated DNA, gene regulation | 90–95% | 182, 183, 184 |
| 232 | Sickle cell anemia | 10.0* | Recessive | HBB | HBB (433) | Hemoglobin subunit beta | P68871 | Oxygen carrier | 100% | 185 |
| 821 | Sotos syndrome/cerebral gigantism | 7.1 | Dominant | APC2; NSD1; SETD2 | NSD1 (228) | Nuclear receptor binding SET domain protein 1 | Q96L73 | Enzyme | 95% | 186, 187, 188, 189, 190 |
| 827 | Stargardt disease/Fundus flavimaculatus | 13.0* | Recessive | ABCA4; CNGB3; ELOVL4; PROM1; PRPH2 | ABCA4 (789) | ATP binding cassette subfamily A member 4 | P78363 | Membrane transporter | 95% | 191, 192, 193 |
| 828 |
Stickler syndrome/ hereditary progressive arthroophthalmopathy |
12.2 | Dominant (most often) or recessive | COL11A1; COL2A1; COL11A2; COL9A1; COL9A2; COL9A3; LOXL3 | COL2A1 (335) | Collagen type II alpha 1 chain | P02458 | Structural protein | 80–90% | 194, 195, 196 |
| 3,193 | Supravalvular aortic stenosis (SVAS) | 13.3* | Dominant | ELN | ELN (25) | Elastin | P15502 | Structural protien | 100% | 197 |
| 848 | β‐Thalassemia | 1,500 | Dominant or recessive | HBB | HBB (434) | Hemoglobin B chain | P68871 | Oxygen carrier | 100% | 198 |
| 609 | Tibial muscular dystrophy/Upp myopathy | 6.0* | Dominant | TTN | TTN (53) | Titin | Q8WZ42 | Muscle protein | 100% | 199 |
| 805 | Tuberous sclerosis complex/Bourneville syndrome | 10.0* | Dominant | TSC1; TSC2 | TSC2 (518) | Tuberin | P49815 | Tumor suppressor, Regulation of mTORC1 signaling | 69% | 200, 201, 202, 203, 204, 205 |
| 892 | Von‐Hippel Lindau disease | 6 | Dominant | VHL | VHL (218) | Von Hippel–Lindau tumor suppressor | P40337 | Tumor suppressor, role in E3 ubiquitin ligase complex | 100% | 206 |
| 903 | Von Willebrand disease | 12.5 | Dominant (most often) or recessive | VWF | VWF (636) | Von Willebrand factor | P04275 | Collagen binding, chaperone for coagulation factor VIII | 100% | 207 |
| 43 | X‐linked adrenoleukodystrophy (ALD) | 5.0 | X‐linked | ABCD1 | ABCD1 (425) | ATP binding cassette subfamily D member 1 | P33897 | Membrane transporter | 100% | 208 |
| 792 | X‐linked retinoschisis (XLRS) | 5.0 | X‐linked | RS1 | RS1 (203) | Retinoschisin 1 | O15537 | Membrane binding, cell–cell adhesion | 100% | 209 |
Value listed is prevalence unless otherwise indicated as “BP” (birth prevalence) or “I” (incidence). Prevalence is a measure of how many people in the population suffer from a given disorder. Birth prevalence is a measure of how many people are born with the disorder already manifest. Incidence is a measure of how many people will develop the disorder during their lifetime (symptoms for many genetic disorders appear only later in life and/or are progressive).
An asterix associated with the prevalence value means this value was determined based on a Western European population, the reference population used by ORPHANET when there was insufficient data to estimate prevalence across the entire human race.
For most common form.
For Charcot–Marie–Tooth disease and related peripheral neuropathies, roughly 55% of cases are caused by the presence of a third wild type allele encoding the peripheral myelin protein 22 (PMP22) protein 210 , 211 and 20% of cases are caused by loss of one of the normal two wild type alleles. Much more rare forms are caused by mutations that either truncate the PMP22 sequence or introduce single amino acid replacements. 212 Mutations impacting any one of another roughly 75 other genes result in the remaining ca. 25% of cases of Charcot–Marie‐Tooth.
There are 72 diseases or families of closely related diseases in our database of common genetic disorders (Table 1). Before we survey this database, it is important to state a major limitation. The prevalence data list in Table 1 is the best available for each disorder as of the time that the 2020 ORPHANET report was compiled. However, prevalence values are often skewed relative to the entire human population by the genetic profile of the specific human sub‐population sampled to determine the prevalence of each disorder. 29 , 30 , 31 , 32 In particular, a majority of the prevalence values in the ORPHANET report are based on the genetic profile of the Western European population. 17 These Euro‐centric prevalence values are flagged in the original ORPHANET compilation and here in Table 1 by affixing an asterisk to the reported value. We regret that we cannot rule out that there may be diseases missing from this table that are common in ethnic groups that are highly underrepresented in the currently available genetic datasets. The identities of the most commonly causative gene and protein for some disorders could also be influenced by ethnicity‐related sample bias. This is critically important since factors related to genetic ancestry influences susceptibility to disease, as well as health outcomes. Therefore, Table 1 must regarded as an evolving “working compilation”, subject to ongoing revisions and updates.
1.2. The common (>1:20,000) monogenic disorders and their causative genes and proteins
We conclude with a few observations about the data in Table 1. First, for 34 of the tabulated monogenic disorders—nearly half—mutations in only a single gene and its encoded protein are known to cause 100% of all cases of that disease. From the standpoint of attempting to therapeutically target all clinical forms of a given disorder with a uniform approach, these single‐causative‐gene‐only monogenic disorders are likely to be the easiest to target. However, it should be recognized that even when there is only a single causative gene, there is always a spectrum of disease mutations in that gene, each of which causes its own clinical features. 33 , 34 The exact nature and severity of each clinical form can vary greatly depending on the details of how each specific mutation impacts the encoded protein. 7 , 35 , 36 For example, mutations in the KCNQ1 potassium channel cause type 1 long QT syndrome (LQTS1). Recent work has shown that the most common classes of LQTS1‐causing mutations destabilize the channel, leading to misfolding, mistrafficking, and degradation—resulting in channel loss of function. However, more rare LQTS1 mutations do not significantly impact the folding of the channel, but lead to loss or dysregulation of function through other mechanisms. 37
For all of the “majority genes” listed in Table 1 there are multiple known disease‐causing mutations, with the total number varying from 11 to >1000. This variation can reflect the amount of research to date devoted for each disease (intensely studied diseases are more likely to yield the identities of their more rare causative mutations than less‐studied diseases), the size of the gene (long genes have a greater number of possible mutations), and also the molecular mechanism(s) that lead to disease pathogenesis. 38 For example, diseases caused by loss of function due to mutation‐induced misfolding often exhibit a spectrum of mutations at sites that are distributed fairly evenly over the full length of the protein, whereas mutations that alter the “active sites” of enzymes, transporters, or channels may be more focused around the specific domains of the protein that embody those sites. 34
In terms of what functional classes of majority gene‐encoded proteins are represented in Table 1, there is a wide range, but 20 are enzymes, 11 are ion channels or membrane transporters, and nine are structural/fibrillar/muscle proteins. That enzymes are the most common functional class in this Table echoes both their numerically high representation in the human proteome 39 and their prominence as the most common class of proteins targeted by currently approved drugs. 40 , 41 However, it is interesting that even though G protein‐coupled receptors are the targets for about 30% of all drugs 40 , 42 the only GPCRs appearing on this list are the photoreceptor of vision, rhodopsin, and the calcium‐sensing receptor.
The inheritance pattern associated with each disease often provides clues about disease mechanism. 43 Recessive disorders are typically caused by the potentially complete loss of function that occurs when both alleles encoding a given protein are subject to a loss of function mutation. Dominant disorders may be caused by the up to 50% loss of function that results from WT/mutant heterozygosity. However, dominance can also reflect either that the mutated protein interacts with the wild type protein in a way that unfavorably interferes with the native WT function or that the mutated protein is actively toxic (often referred to as “toxic gain of function”). 6 X‐linked disorders usually affect men more severely—sometimes exclusively—because the mutated X chromosome gene will be present in all of their cells, whereas for women some cells will express the wild type form of the gene while the other cells will express the disease mutant. 44
Finally, while we have not conducted a detailed analysis of the current state of therapeutics development for each disease listed in Table 1, many of these disorders are serious and currently have no effective treatment, much less a cure. Moreover, even for those where there are therapeutic approaches, available treatments sometimes do not address the underlying defects in the mutated protein(s) that cause the disease. As noted, cystic fibrosis provides an exception, where 30 years of intense research and development has led to an effective set of drugs that target the molecular basis for the disease. It is hoped that this compendium may prove useful to those looking either to establish new projects focused on proteins of direct disease relevance or to initiate drug discovery efforts that target relatively common diseases with a clear genotype–phenotype relationships.
CONFLICT OF INTEREST
The authors declare no conflict of interest.
AUTHOR CONTRIBUTIONS
Tucker L. Apgar: Data curation (equal); formal analysis (equal); investigation (equal); methodology (equal); writing – review and editing (supporting). Charles R. Sanders: Conceptualization (equal); formal analysis (equal); investigation (equal); methodology (equal); project administration (equal); resources (equal); supervision (equal); writing – original draft (lead).
ACKNOWLEDGMENTS
We acknowledge the support of US NIH grants R01 HL122010, R01 NS095899, and RF1 AG056147. Partial support for Tucker L. Apgar was provided by an Vanderbilt University Summer Research Program award. We also thank Professors Alfred George (Northwestern University Feinberg School of Medicine), Jamaine Davis (Meharry Medical College), and Roy Zent (Vanderbilt University Medicine Center) for their useful comments and suggestions related to this manuscript.
Apgar TL, Sanders CR. Compendium of causative genes and their encoded proteins for common monogenic disorders. Protein Science. 2022;31:75–91. 10.1002/pro.4183
Funding information National Heart, Lung, and Blood Institute, Grant/Award Number: R01 HL122010; National Institute of Neurological Disorders and Stroke, Grant/Award Number: R01 NS095899; National Institute on Aging, Grant/Award Number: RF1 AG056147; US NIH, Grant/Award Numbers: RF1 AG056147, R01 NS095899, R01 HL122010
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