Abstract
Purpose
Valsartan, an angiotensin II receptor blocker, is widely used for hypertension and heart failure. While its cardiovascular benefits are established, its broader pharmacological effects remain incompletely characterized. This study aimed to identify genetic variants associated with valsartan use and to systematically explore its potential effects and adverse events across a wide range of phenotypes.
Methods
Using UK Biobank data, we selected participants of European ancestry prescribed valsartan as cases, compared with controls not prescribed any ARBs. A genome-wide association study (GWAS) was conducted to identify suggestive genetic variants associated with valsartan use. These variants were then used as instruments in a phenome-wide association study (PheWAS) to screen for associated traits. Mendelian randomization analyses, including inverse-variance weighted and pleiotropy-robust methods, were employed to assess potential causal relationships.
Results
The GWAS identified 19 suggestive single nucleotide polymorphisms (P < 1 × 10−5) near genes, including PREP, GCLC, and ZNF133. The PheWAS analysis revealed associations with 14 phenotypes, including lower levels of total cholesterol (β = −0.59) and low-density lipoprotein cholesterol (LDL-C) (β = −0.56), and increased risk of cough (odds ratio = 1.67). Mendelian randomization provided genetic evidence consistent with potential causal effects of valsartan in lowering LDL-C (β = −2.34 × 10−3) and reducing the risk of transient cerebral ischemic attack.
Conclusion
Our genetic-based study suggests valsartan use may be associated with lowered LDL-C and reduced risks of certain ischemic cardiovascular events. These findings generate novel hypotheses regarding the drug’s pleiotropic effects and potential applications beyond hypertension management, which warrant further clinical investigation.
Keywords: cardiovascular disease, genome-wide association study, Mendelian randomization, phenome-wide association study, valsartan
Introduction
Cardiovascular disease (CVD) is a contributor to worldwide mortality [1]. Arteriosclerosis is a key factor in the aging of vascular tissue and a reliable indicator of multiple vascular pathologies and mortality, whereas pulse wave velocity is a recognized measure of arteriosclerosis [2–4]. Recent research has shown that angiotensin II receptor blockers (ARBs), which are antihypertensive medications, can increase vascular stiffness via the pulse wave velocity regardless of blood pressure [5,6]. However, no study has explored the association of valsartan with arteriosclerosis risk decrease, and given the multitude of drug types and high incidence of adverse events, selecting the appropriate drug for patients can be challenging [7].
Valsartan belongs to the class of antihypertensive drugs: ARBs, which lower blood pressure while treating heart failure [8]. According to recent studies, valsartan also ameliorates atherosclerosis, cardiac arrhythmia, chronic kidney disease, and other disorders, improving individual treatment effects [9–12]. No studies on the pharmacogenomics (PGx) associated with the adverse events of valsartan have been reported. In Pfeffer et al.’s research [13], 83.1% of participants reported adverse events, including hypotension, hyperkalemia, renal dysfunction, cough, and angioedema. We hope to refine the understanding of valsartan adverse events through bioinformatics approaches.
Genome-wide association studies (GWASs) are frequently employed in PGx research. It has the ability to anticipate polygenic risk scores and potential targets for adverse drug reactions [14–16]. Phenome-wide association studies (PheWASs) invert the idea of a GWAS by searching for phenotypes associated with specific single nucleotide polymorphisms (SNPs) across the range of thousands of human phenotypes [17].
PheWAS improves the understanding of the pleiotropic effects of drug targets, reveals opportunities for drug repurposing, and helps identify potential new drug targets [18–20]. Johnston et al. [18] reported that PheWAS was significantly associated with phenotypes, including cardiac dysrhythmia and metabolic syndrome, indicating potential shared mechanisms. This approach provides causal evidence for relevant phenotypes in PheWASs and contributes to the understanding of potential pathways to drug targets. Furthermore, it allows for the investigation of the causal relationship between the reduction in arteriosclerosis and CVD caused by valsartan and the identification of the underlying mechanisms and pathways. However, there is currently a lack of research on the mechanisms underlying the ability of valsartan to reduce arteriosclerosis [21,22].
Valsartan plays crucial roles in the prevention and treatment of CVDs. Our findings that valsartan lowers low-density lipoprotein (LDL) are necessary to improve the existing knowledge of valsartan. We used GWAS to discover valsartan PGx and performed PheWAS to investigate the potential effects of other phenotypes.
Materials and methods
Study design
First, a GWAS was performed to determine the PGx value of valsartan in the UK Biobank (UKB) data. We subsequently performed PheWAS of the significant SNPs from the GWAS, valsartan, and UKB Electronic Medical Record phenotypic data. Finally, we conducted Mendelian randomization analysis utilizing valsartan as the exposure variable, PheWAS results as the intermediate variable, and CVD as the outcome variable.
Sample description
UKB is a prospective study involving approximately 500 000 participants aged 40–69 years at the time of recruitment. Participants were recruited in the UK between 2006 and 2010 and remain of interest. The mean age of the sequenced individuals at recruitment was 56.5 years, and 54% of the sequenced cohort was female. Participant data included regularly updated health records from the UKB, self-report survey information, links to death and cancer registries, urine and blood biomarker collections, imaging data, accelerometer data, and various other phenotypic endpoints. All study participants provided informed consent.
Genome-wide association study
GWAS quality control was performed via PLINK 1.9 [23]. SNP missing rates higher than 5% and missing rates per person higher than 5% were filtered out. A total of 194 681 SNPs were removed, and no individuals were removed. The thresholds of X chromosome heterozygosity rates (F values) were 0.2 for females and 0.8 for males, resulting in the removal of 820 individuals. A total of 202 770 SNPs with minor allele frequencies less than 0.01 were filtered out. Hardy–Weinberg equilibrium was calculated for all the SNPs, and 2621 SNPs were terminated (Hardy–Weinberg equilibrium < 10−6). A total of 4594 individuals whose heterozygosity was greater than three times the SD were excluded. Finally, an analysis of relatedness was performed, and 23 063 people with PI_HAT > 0.2 were removed.
Multidimensional scaling principal component analysis was performed on the high-quality data, and the top 20 principal components were selected to be used as covariates in the subsequent association analysis. A generalized linear model (GLM) was constructed to explore associated SNPs. In the GLM, the SNPs were used as the dependent variable; valsartan was used as the independent variable; and age, sex, and principal components were used as the covariates. The valsartan-associated SNPs were obtained using 5 × 10−8 and 5 × 10−5 as the stringent and potential P value thresholds, respectively. Linkage disequilibrium score regression was subsequently performed to find the SNPs with the smallest P value in each significant region.
Functional annotation of genes
With the help of the database and corresponding annotation tool ANNOVAR [24], the SNP information related to valsartan consumption obtained from GWAS will be annotated with gene function from the hg38 database, and its potential association with valsartan consumption will be analyzed in conjunction with gene function.
Enrichment analysis
Using the clusterProfiler, the org.Hs.eg.db, the enrichplot, and the ggplot2 packages in the R language, the obtained genes were subjected to Gene Ontology analyses. The bubble plots of the enrichment results of the three entries of biological process, cellular component, and molecular function.
Identification of shared phenotypes and phenome-wide association study
PheWAS was performed via DeepPheWAS [25], and the analysis process was divided into three parts: phenotype extraction, phenotype creation, and association analysis.
Phenotype extraction: the required phenotypes were extracted from the UKB phenotypic dataset file ID and streamlined into patient ID, disease code, onset time, and data source. The major phenotype file IDs can be found in the Supplementary materials.
Phenotype creation: First, extract the disease code, and convert codes to specific diseases, convert patient prescription records and clinical phenotypes to corresponding diseases (e.g. taking blood pressure lowering medications recorded as hypertension), and combine multiple diseases/phenotypes to generate composite phenotypes [e.g. hypertension combined with myocardial infarction (MI) as CVD]. Diseases with a prevalence value less than 25 were removed, and phenotypes were stratified by sex and age.
Association analysis: suggestive SNPs obtained from GWASs were extracted via PLINK. To determine whether one carries these SNPs as y, one has the disease phenotype as x, corrected for age and sex as covariates, and association analysis was performed via the logistic regression model to obtain the potentially relevant phenotypes for taking valsartan, with a P value threshold of <0.01.
Mendelian randomization
We investigated the causal relationship between valsartan and CVD via phenotype via our PheWAS analysis. We utilized the ‘TwoSampleMR’ [26] package for the two-step Mendelian randomization analysis, extracted summary data on valsartan from our GWAS results and the IEU GWAS database [27], and extracted summary data on valsartan and CVD. We harmonized the exposure and outcome datasets and performed Mendelian randomization instrumental variable analyses via inverse-variance weighting (IVW). We assessed the R2 and F value for each instrumental variable to ensure robustness.
Finally, the results are presented as odds ratios (ORs) with 95% confidence intervals (CIs). The Bonferroni correction was applied in the current Mendelian randomization analysis to account for multiple comparisons. Findings for which the P value was less than 0.0026 (0.05 divided by 19) indicated a significant causal association. In addition, P values between 0.0026 and 0.05 were considered suggestive of a causal association.
A key assumption of Mendelian randomization is that the exposure precedes the outcome. While our genetic instruments are fixed at conception, the measurement of phenotypes like LDL cholesterol (LDL-C) in UKB primarily occurs at baseline assessment. We cannot definitively ascertain that valsartan initiation preceded the LDL-C measurement for all individuals. This introduces a potential for reverse causality, whereby lower LDL-C levels could influence prescribing patterns, although this is less biologically plausible than the drug affecting the trait.
Results
Dataset
This study excluded individuals of non-White race in the UKB sample according to ethnic background ethnicity and those taking ARBs other than valsartan according to the UKB treatment/medication code (Supplementary Table S1, Supplemental digital content 1, https://links.lww.com/FPC/B537). The case group consisted of 2305 people taking valsartan and 346 359 controls who did not take ARB drugs (Fig. 1a). The median age was 58 years (interquartile range: 51–63 years), and 43.7% were men. All phenotypes were derived from the UKB data file and UKB Electronic Medical Record, and the remaining 1612 phenotypes were filtered and merged for PheWAS analysis (Fig. 1b).
Fig. 1.
Study sample exclusion flowchart and phenotype characteristics. (a) Flowchart of study sample exclusion: non-White and British individuals removed and ARBs-using patients removed. (b) All 1612 phenotypes from the UKB EMRs. ARBs, angiotensin II receptor blocker; EMRs, Electronic Medical Records; UKB, UK Biobank.
Genome-wide association study with valsartan
Nineteen suggestive SNPs associated with valsartan administration were obtained through GWAS via the GLM (Fig. 2a). Six introns, 11 intergenic sequences, and two noncoding RNA (ncRNA) introns were annotated via ANNOVAR software via the hg38 database (Table 1).
Fig. 2.
GWAS with valsartan. Manhattan plot of the valsartan GWAS, significance threshold, P = , and 19 SNPs associated with valsartan. (b)–(d) GO enrichment analysis bar graph, demonstrating the enrichment of valsartan GWAS results. BP, biological process; CC, cellular component; GO, Gene Ontology; GWAS, genome-wide association study; MF, molecular function; SNPs, single nucleotide polymorphisms.
Table 1.
Whole-genome sequencing of variants with genome-wide significance
| CHR | SNP | ALT | Function | Reference | OR | P value |
|---|---|---|---|---|---|---|
| 6 | rs17065795 | T | Intronic | PREP | 1.406 | 2.47 × 10−7 |
| 9 | rs78502612 | C | ncRNA Intronic | LINC01505 | 1.335 | 7.60 × 10−7 |
| 2 | rs2675058 | G | Intergenic | DUSP19, NUP35 | 1.197 | 1.74 × 10−6 |
| 11 | rs10794344 | T | Intronic | AP2A2 | 1.785 | 2.18 × 10−6 |
| 6 | rs17193216 | G | Intronic | GCLC | 1.570 | 2.66 × 10−6 |
| 2 | rs138454785 | C | Intergenic | FSHR, NRXN1 | 0.4566 | 3.64 × 10−6 |
| 1 | rs72649484 | T | Intergenic | MIR4418, ZBTB40 | 1.670 | 3.79 × 10−6 |
| 13 | rs7335418 | C | Intergenic | LINC00564, SLITRK1 | 1.216 | 4.00 × 10−6 |
| 6 | rs2023471 | A | ncRNA intronic | TRIM31-AS1 | 0.8262 | 4.12 × 10−6 |
| 11 | rs11600848 | C | Intronic | RAB30 | 1.204 | 4.30 × 10−6 |
| 20 | rs2843443 | T | Intronic | ZNF133 | 1.351 | 4.69 × 10−6 |
| 1 | rs2773159 | A | Intergenic | LINC01343, LINC01685 | 1.174 | 5.30 × 10−6 |
| 16 | rs16946901 | T | Intergenic | N4BP1, CBLN1 | 1.202 | 6.35 × 10−6 |
| 5 | rs58353765 | G | Intergenic | LINC01947, TENM2 | 0.8549 | 6.57 × 10−6 |
| 3 | rs17188910 | C | Intergenic | LOC105377143, KBTBD8 | 1.492 | 8.11 × 10−6 |
| 15 | rs71401392 | A | Intergenic | FAM169B, IRAIN | 1.534 | 8.58 × 10−6 |
| 1 | rs6666026 | G | Intronic | SLC35F3 | 0.8484 | 8.66 × 10−6 |
| 4 | rs72723435 | A | Intergenic | LINC02508, LINC01262 | 1.181 | 8.94 × 10−6 |
| 11 | rs17418380 | G | Intergenic | INSC, LINC02751 | 0.8097 | 9.83 × 10−6 |
ALT, alternative allele; CHR, chromosome; ncRNA, noncoding RNA; OR, odds ratio; SNP, single nucleotide polymorphism.
Among them, we found that four SNPs could explain the individual differences in valsartan. rs17065796 (P = 2.47 × 10−7) is in the intron of the PREP gene, which transcriptionally and posttranslationally cleaves the peptide bond at the C-terminal end of intrapeptide prolyl residues up to approximately 30 amino acids in length. It is also associated with angiotensin-converting enzyme inhibitor responsiveness; rs17193216 (P = 2.66 × 10−6) is in the intron of the GCLC gene, which catalyzes the ATP-dependent ligation of L-glutamate and L-cysteine after transcription and translation and is involved in the first and rate-limiting step of glutathione biosynthesis. It has also been associated with total cholesterol; rs2843443 (P = 4.69 × 10−6) is located in the ZNF133 gene, which is likely involved in blocking the transcription process, the mechanism of which is currently unknown. It is associated with poor survival and advanced pathological staging of breast carcinomas. rs78502612 is in the intron of the long intergenic ncRNA LINC01505, which contains 13 gene enhancers, such as SLC44A1, FSD1L, and FKTN, in a 1 Mb DNA region in the vicinity of rs78502612. rs2023471 is located in the ncRNA TRIM31-AS1 (TRIM31 antisense RNA) intron, which is associated with the erythrocyte count, leukocyte count, and eosinophil-to-leukocyte ratio. However, the GWAS-based Gene Ontology enrichment analysis highlights additional mechanistic layers (Fig. 2b–d). The significant enrichment of SNPs in pathways related to clathrin-mediated endocytosis and cellular polarity suggests that valsartan may also related with dynamic control of angiotensin II type 1 receptor trafficking (via endocytosis-related genes – CLTC and AP2B1 [28]) and vascular remodeling (via polarity-associated pathways).
Phenome-wide association study of valsartan
To explore the pleiotropic effect of valsartan on a variety of complex traits in humans, we performed a PheWAS of 19 GWAS identified significant SNPs associated with valsartan and valsartan usage. The valsartan SNP rs2023471 located in TRIM31-AS1 intron indicated that white blood cell (leukocyte) count (P < 6.02 × 10−40), lymphocyte count (P < 1.50 × 10−27), neutrophil count (P < 1.50 × 10−25), mean corpuscular hemoglobin (P < 1.60 × 10−23), and 18 other phenotypes were significantly associated with the SNP rs2023471 (P < 3.10 × 10−5; 3.10 × 10-5 = 0.05/1612) (Fig.3a and b). Among other valsartan SNPs, rs2773159 between LINC01343 and LINC01685 was associated with red blood cell (erythrocyte) count (P < 7.00 × 10−6) and hemoglobin concentration (P < 1.46 × 10−5); rs71401392 near FAM169B was associated with standing height (P < 2.08 × 10−8) and sitting height (P < 5.51 × 10−6); rs78502612 was associated with sitting height (P < 6.44 × 10−9) and ulcers of the esophagus (P < 1.12 × 10−5); rs11600848 located in RAB30 was associated with sex hormone binding globulin (P < 6.29 × 10−8); rs2675058 was associated with platelet distribution width (P < 8.6 × 10−19); rs72649484 was associated with alkaline phosphatase (P < 1.38 × 10−9); and rs72723435 was significantly associated with digestive congenital anomalies (P < 2.93 × 10−5) (Supplementary Table S2, Supplemental digital content 1, https://links.lww.com/FPC/B537).
Fig. 3.
PheWAS of valsartan GWAS SNPs and valsartan use. (a) Manhattan plot of valsartan GWAS SNPs PheWAS, significant phenotypes gathered via quantitative measures. (b) All of the significant phenotypes, including leukocyte and lipid measurements, are shown. (c) Volcano plot of valsartan use PheWAS, waist circumference, and BMI are positively correlated with valsartan, and eGFR and cholesterol are negatively correlated with valsartan. (d) Forest plot of valsartan use PheWAS; valsartan may improve the risk of these symptoms. CI, confidence inteval; eGFR, estimated glomerular filtration rate; FDR, false discovery rate; GWAS, genome-wide association study; NOS, nomen satis; OR, odds ratio; PheWAS, phenome-wide association study.
With valsartan via PheWAS, we found that the estimated glomerular filtration rate (eGFR) (P < 6.18 × 10−257; β = −0.72), waist circumference (P < 1.86 × 10−255; β = 0.71), BMI (P < 5.31 × 10−234; β = 0.69), urate level (P < 3.36 × 10−199; β = 0.63), cholesterol level (P < 2.04 × 10−174; β = −0.59), and 52 other quantitatively measured phenotypes (P < 3.10 × 10−5; 3.10 × 10−5 = 0.05/1612) were associated with valsartan use (Fig. 3c; Supplementary Table S3, Supplemental digital content 1, https://links.lww.com/FPC/B537). We also detected five primary care symptoms associated with valsartan use: snoring (P < 3.53 × 10−25, OR = 1.58), narcolepsy (often) (P < 6.09 × 10−17, OR = 2.25), usual bad sleeper compared with never/sometimes (P < 1.14 × 10−15, OR = 1.43), comparative body size plumper (P < 3.78 × 10−6, OR = 1.28), and cough on most days (P < 7.37 × 10−6, OR = 1.67) (Fig. 3d). Finally, we found that 14 phenotypes, including white blood cell counts, were associated with the valsartan SNPs PheWAS and the valsartan PheWAS (Supplementary Table S3, Supplemental digital content 1, https://links.lww.com/FPC/B537).
Mendelian randomization analysis of valsartan
We performed a two-sample Mendelian randomization of the identified PheWAS results on the risk of CVD (Fig. 4a). We found evidence that valsartan increases the platelet distribution width and eosinophil count and decreases LDL-C, aspartate aminotransferase, and peak expiratory flow (Fig. 4b), and all supplementary Mendelian randomization methods yielded effect estimates that were consistent in direction and of similar magnitude to the primary IVW analysis for the association between valsartan and lower LDL-C and other results (Supplementary Table S4, Supplemental digital content 1, https://links.lww.com/FPC/B537). Valsartan could benefit from transient cerebral ischemic attack, asthma, and acute transmural MI on the basis of the International Classification of Diseases, Tenth Revision, Mendelian randomization. However, the risk of cholecystitis and urethral stricture increases with valsartan usage (Fig. 4c). These results provide further evidence of the reliability of the PheWAS.
Fig. 4.
Mendelian randomization study of valsartan. (a) Mendelian randomization design; E, exposure; M, mediating variable; Y, outcome variable; IV, instrumental variables; (b) Forest plot of clinical data Mendelian randomization; (c) Forest plot of ICD-10 Mendelian randomization. The outcomes from the IEU GWAS database meta-analysis. CI, confidence inteval; CVD, cardiovascular disease; ICD-10, International Classification of Diseases, Tenth Revision; OR, odds ratio; PheWAS, phenome-wide association study; SNP, single nucleotide polymorphism.
Discussion
This study employed a multistep genetic approach to investigate the therapeutic effects and potential adverse events associated with valsartan therapy. Our principal findings indicate that valsartan exposure is associated with a reduction in LDL-C and a decreased risk of several cardiovascular outcomes, including transient cerebral ischemic attacks and acute MI. Conversely, we also identified potential associations with increased arterial stiffness and a reduction in eGFR, warranting careful interpretation.
The LDL-lowering effect represents a novel and significant finding. This effect was consistently demonstrated across our analytical pipeline, from the initial PheWAS to the confirmatory two-sample Mendelian randomization analysis. This suggests a potential mechanism of action for valsartan beyond its established angiotensin receptor blockade. The identified genetic instrument, the intronic SNP rs17193216 in the GCLC gene, offers a potential biological pathway on increasing total cholesterol [29]. GCLC encodes the catalytic subunit of glutamate–cysteine ligase, the rate-limiting enzyme in glutathione synthesis. Modulation of this gene could influence oxidative stress pathways, which are intimately linked to lipid metabolism and atherogenesis. While prior clinical evidence, such as the finding from Seferovic et al. [30] that the sacubitril/valsartan combination increased HDL cholesterol, hints at valsartan’s lipid-modifying potential, our study provides direct genetic evidence specifically implicating valsartan in LDL reduction.
The observed association with decreased eGFR aligns with known pharmacodynamics of renin–angiotensin–aldosterone system inhibitors. An acute drop in eGFR is a recognized hemodynamic effect of these agents, often indicative of effective intraglomerular pressure reduction and not necessarily of intrinsic renal damage. This finding, therefore, may reflect the drug’s intended action rather than an adverse event, though long-term clinical monitoring remains prudent [31].
More complex is the association with a higher pulse wave arterial stiffness index. We posit that this likely reflects indication bias or residual confounding rather than a direct causal effect of the drug. Valsartan is prescribed to patients with hypertension, a condition strongly associated with and causative of underlying atherosclerosis and arterial stiffening. Our genetic methodology may not have fully adjusted for the severity of the baseline cardiovascular phenotype in valsartan users. It is highly improbable that valsartan, an antihypertensive agent with demonstrated cardiovascular benefits, directly causes arterial stiffening; a more plausible explanation is that we were unable to accurately obtain the timing of arterial stiffness testing and the duration of valsartan use in the cohort.
Several limitations must be considered when interpreting these results. First, the genetic data were sourced exclusively from the UKB, a cohort of predominantly European ancestry, which restricts the generalizability of our findings to other ethnic populations. Second, while Mendelian randomization strengthens causal inference, our results require validation in dedicated clinical cohorts. Finally, the lack of granular data on medication dosage, duration, and adherence in the source dataset prevents us from exploring dose-response relationships, which may significantly influence the observed outcomes.
In conclusion, our analysis provides genetic support for a novel LDL-lowering effect of valsartan, suggesting it may be a particularly suitable antihypertensive agent for patients with concomitant dyslipidemia. The associations with renal function and arterial stiffness are likely related to its mechanism of action and underlying patient characteristics, respectively. These findings generate important hypotheses regarding the drug’s pleiotropic effects but must be confirmed through prospective clinical studies before any implications for clinical practice can be drawn.
Acknowledgements
We are sincerely thankful to the China National GeneBank for the instrument support.
This work was supported by the National Key Research and Development Program of China (No. 2020YFC2008002).
Conceptualization: S.Z. and T.L. Methodology: S.Z., Y.L., and Y.L. Formal analysis, investigation, and visualization: S.Z. Data curation: S.Z., Y.Z., and L.R. Writing – original draft preparation:S.Z., Y.L., and B.C. Writing – review and editing: B.C. Supervision: T.L. Project administration: J.Z. and T.L. Funding acquisition: T.L. and C.Z. All the authors read and approved the final manuscript.
The UK Biobank data were approved by the North West Multicenter Research Ethics Committee (REC reference: 21/NW/0157).
The datasets generated and/or analyzed during the current study are available in the UK Biobank repository, https://www.ukbiobank.ac.uk/.
Conflicts of interest
There are no conflicts of interest.
Supplementary Material
Footnotes
Shengyin Zeng and Yaxin Li contributed equally to the writing of this article.
Supplemental Digital Content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal’s website, www.pharmacogeneticsandgenomics.com.
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