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Liver eQTL meta-analysis illuminates potential molecular mechanisms of cardiometabolic traits

荟萃分析 表达数量性状基因座 计算生物学 生物 生物信息学 医学 内科学 遗传学 基因 基因型 单核苷酸多态性
作者
K. Alaine Broadaway,Sarah M. Brotman,Jonathan D. Rosen,Kevin W. Currin,Abdalla A Alkhawaja,Amy S. Etheridge,Fred A. Wright,Paul J. Gallins,Dereje D. Jima,Yi‐Hui Zhou,Michael I. Love,Federico Innocenti,Karen L. Mohlke
出处
期刊:American Journal of Human Genetics [Elsevier]
卷期号:111 (9): 1899-1913
标识
DOI:10.1016/j.ajhg.2024.07.017
摘要

Understanding the molecular mechanisms of complex traits is essential for developing targeted interventions. We analyzed liver expression quantitative-trait locus (eQTL) meta-analysis data on 1,183 participants to identify conditionally distinct signals. We found 9,013 eQTL signals for 6,564 genes; 23% of eGenes had two signals, and 6% had three or more signals. We then integrated the eQTL results with data from 29 cardiometabolic genome-wide association study (GWAS) traits and identified 1,582 GWAS-eQTL colocalizations for 747 eGenes. Non-primary eQTL signals accounted for 17% of all colocalizations. Isolating signals by conditional analysis prior to coloc resulted in 37% more colocalizations than using marginal eQTL and GWAS data, highlighting the importance of signal isolation. Isolating signals also led to stronger evidence of colocalization: among 343 eQTL-GWAS signal pairs in multi-signal regions, analyses that isolated the signals of interest resulted in higher posterior probability of colocalization for 41% of tests. Leveraging allelic heterogeneity, we predicted causal effects of gene expression on liver traits for four genes. To predict functional variants and regulatory elements, we colocalized eQTL with liver chromatin accessibility QTL (caQTL) and found 391 colocalizations, including 73 with non-primary eQTL signals and 60 eQTL signals that colocalized with both a caQTL and a GWAS signal. Finally, we used publicly available massively parallel reporter assays in HepG2 to highlight 14 eQTL signals that include at least one expression-modulating variant. This multi-faceted approach to unraveling the genetic underpinnings of liver-related traits could lead to therapeutic development.
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