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[Preprint]. 2025 Apr 14:2025.04.11.25325582.
doi: 10.1101/2025.04.11.25325582.

Genome-wide association study and multi-ancestry meta-analysis identify common variants associated with carotid artery intima-media thickness

Devendra Meena  1 Jian Huang  1 Marjan Zare  2 Natalie R Hasbani  3 Boua Palwendé Romuald  4 Rima Mustafa  1 Sander W van der Laan  5 Huichun Xu  6 James G Terry  7 Joshua C Bis  8 Deepti Jain  9 Nicholette D Palmer  10 Nancy Heard-Costa  11   12 Yuan-I Min  13 Xiuqing Guo  14 Jie Yao  14 Kent D Taylor  14 Jingyi Tan  14 Juan Peralta  15   16 Alexandre C Pereira  17   18 Alyna Khan  9 Ananyo Choudhury  19 Anne B Newman  20 Anny H Xiang  21 Aroon Hingorani  22 Barry I Freedman  23 Christopher J O'Donnell  24 Claudia Giambartolomei  25 David M Herrington  26 David R Jacobs Jr  27 Derek Klarin  28   29 Fei Fei Wang  9 Gerardo Heiss  30 HarshaVardhan Doddapaneni  31 Howard N Hodis  32 Jai Broome  9 James G Wilson  33 Jean-Tristan Brandenburg  19 John Blangero  15   16 Jose E Krieger  18 Josh D Smith  34   35 Karine A Viaud-Martinez  36 Kathleen A Ryan  6 Leslie A Lange  37 May E Montasser  6 Michael C Mahaney  15   16 Michal Mokry  38 Myriam Fornage  39 Patricia Munroe  40   41 Richard A Gibbs  31   42 Russell P Tracy  43 Ryan W Kim  44 Scott M Damrauer  45 Stephen S Rich  46 Willa A Hsueh  47 Yii-Der Ida Chen  14 NHLBI Trans-Omics for Precision Medicine (TOPMed) Consortium, The Million Veteran Program (MVP), TOPMed Atherosclerosis Working GroupAlanna C Morrison  3 Braxton D Mitchell  6   48 John Jeffrey Carr  7 Bruce M Psaty  8   49   50 Donald W Bowden  10 Ramachandran S Vasan  12   51   52 Adolfo Correa  13   53 Wendy S Post  54 Mark O Goodarzi  55 Leslie J Raffel  56 Joanne E Curran  15   16 Michele Ramsay  19 Jerome I Rotter  14 Paul Elliott  57   58   59 Nora Franceschini  30 Paul S de Vries  3 Ioanna Tzoulaki  1   60   61 Abbas Dehghan  1
Affiliations

Genome-wide association study and multi-ancestry meta-analysis identify common variants associated with carotid artery intima-media thickness

Devendra Meena et al. medRxiv. .

Abstract

Carotid artery intima-media thickness (cIMT) is a measurement of subclinical atherosclerosis that predicts future cardiovascular events, including stroke and myocardial infarction. Genome-wide association studies (GWAS) have identified only a fraction of the genetic variants associated with cIMT. We performed the largest GWAS for cIMT involving up to 131,000 individuals. For the first time, we meta-analysed a diverse range of ancestries including populations with African, Asian (Chinese), Brazilian, European, and Hispanic ancestries. Our study identified 59 independent loci (53 loci from the multi-ancestry single variant analysis of which 19 are novel, P<5×10-8; 6 novel in gene-based analysis from single variant analysis, P=2.6×10-6, 2 novel in meta-regression) associated with cIMT. Gene-based, tissue-expression and gene-set enrichment analyses revealed novel genes of potential interest and highlighted significant relationships between vascular tissues (aorta, coronary and tibial arteries) and genetic associations. We found that circulatory levels of seven proteins, including ACAN, BCAM, DUT, ERI1, APOE, FN1, and GLRX were potentially causally associated with cIMT levels. We found a strong genome-wide correlation between cIMT and various cardiometabolic, smoking phenotypes, and lipid traits. Using Mendelian randomisation, our analyses provide robust evidence for causal associations between cIMT and several clinically relevant traits, including lipids, blood pressure, and waist circumference. Our study extends our genetic knowledge of atherosclerosis and highlights potential causal relations between risk factors, atherosclerosis and clinical diagnoses.

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Conflict of interest statement

C.J.O. is a full-time employee at Novartis Institute of Biomedical Research. S.W.L. has received Roche funding for unrelated work. R.W.K. is an employee at Psomagen Inc. B.M.P. serves on the steering committee of the Yale Open Data Access Project funded by Johnson & Johnson. M.E.M. receives funding from Regeneron Pharmaceuticals Inc. unrelated to this project. KAV-M is an employee at Illumina Inc. All remaining authors declare no competing interests.

Figures

Figure 1.
Figure 1.. Manhattan and Fuji plots of common variants associated with cIMT
(a) Fuji plot showing independent loci associated with cIMT. The colour-coded circles (from inside to outside) represent GWAS of 1) IMTmean-max GWAS in women in UKBB; 2) IMTmean-max GWAS in men in UKBB; 3) IMTmean in UKBB; 4) IMT mean-max in UKBB and 5) IMTmean-max multi-ancestry GWAS meta-analysis. Every dot represents a locus associated with cIMT; large dots represent cross-trait loci, while small dots represent trait-specific loci. Genes with an asterisk denote novel cIMT loci; (b) Manhattan plot for the multi-ancestry GWAS on cIMT showing the negative log10 transformed P value for each SNP on the y axis and the base-pair position of the SNPs on each chromosome on the x-axis. The genome-wide-significance threshold (P < 5 × 10–8) is represented as the horizontal red line. The 51 cIMT loci are annotated; red and black dots refer to novel and known loci, respectively; and (c) Gene-based analysis: Manhattan plot showing the genes associated with cIMT in the gene-based analysis. The y-axis shows the negative log10 transformed P value of the gene-based test computed in MAGMA, and the x-axis shows the genomic position on each chromosome. The red line indicates the Bonferroni-corrected threshold for genome-wide significance (P = 2.6×10−6 (0.05/19,220 genes). The novel signals from the gene-based test are highlighted in red.
Figure 2.
Figure 2.. Functional annotation of cIMT-associated variants
a) MAGMA tissue expression analysis using gene expression per tissue based on GTEx version 8 data for 53 specific tissue types. The horizontal dotted line indicates the Bonferroni-corrected significance threshold (P = 0.05/53; -log10 transformed). Significant tissues are shown in red. (b) Differential expression gene analysis of prioritized genes across GTEx version 8 30 general tissue types. Genes with P-value ≤ 0.05 after Bonferroni correction and absolute log fold change ≥ 0.58 were defined as differentially expressed genes in a given tissue compared to others. Significantly enriched DEG (Bonferroni corrected P-value ≤ 0.05) are highlighted in red. (c) Gene-set and pathway enrichment analysis; and (d) Venn diagram showing overlap of genes implicated by positional mapping, chromatin interactions, GWGAS, and eQTL mapping. GWGAS, genome-wide gene-based association study; eQTL, Expression quantitative trait loci.
Figure 3.
Figure 3.. Association of the identified cIMT SNPs with clinical traits and diseases
(a) Look up in GWAS catalog (b) Look up in published GWAS on cardiovascular diseases, and (c) Look up in published GWAS on cardiovascular traits. PAD, peripheral arterial disease; AD, Alzheimer’s disease; CAD, coronary artery disease; Plaque, carotid plaque; ASI, arterial stiffness index; BP, blood pressure.
Figure 4.
Figure 4.. Forest plot of the IVW, WM and MR-Egger estimates.
(a) Effect of cardiovascular risk factors on cIMT, (b) Effect of cIMT on cardiovascular traits and diseases and c) Forest plot for the effect estimates of selected plasma proteins on cIMT. *Represents proteins with Wald ratio (causal estimate obtained for a single genetic variant). MR, Mendelian randomization; IVW, inverse-variance weighted; WM, weighted median.
Figure 4.
Figure 4.. Forest plot of the IVW, WM and MR-Egger estimates.
(a) Effect of cardiovascular risk factors on cIMT, (b) Effect of cIMT on cardiovascular traits and diseases and c) Forest plot for the effect estimates of selected plasma proteins on cIMT. *Represents proteins with Wald ratio (causal estimate obtained for a single genetic variant). MR, Mendelian randomization; IVW, inverse-variance weighted; WM, weighted median.
Figure 5.
Figure 5.. Cell-type specific expression in carotid plaques of candidate genes.
The y-axis shows cell types as previously described . The size of the dot shows the percentage of cells expressing the respective genes, and the colour indicates the average total expression in that cell-types.

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