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Genet Epidemiol. 2019 Feb 15. doi: 10.1002/gepi.22195. [Epub ahead of print]

Gene-environment interactions related to blood pressure traits in two community-based Korean cohorts.

Author information

1
Department of Biochemistry and Molecular Biology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea.
2
Department of Endocrinology and Metabolism, Kyung Hee University School of Medicine, Seoul, Republic of Korea.
3
Institute for Health and Society, Hanyang University, Seoul, Republic of Korea.
4
Department of Preventive Medicine, College of Medicine, Hanyang University, Seoul, Republic of Korea.
5
Division of Biobank for Health Science, Center for Genome Science, Korea National Institute of Health, Chungcheongbuk-do, Republic of Korea.

Abstract

Hypertension is a complex disorder caused by genetic and environmental risk factors. Recently, genome-wide association studies (GWASs) identified more than 100 genetic variants for blood pressure traits and hypertension. However, the interactions between these genetic variants and environmental factors have not been systematically investigated. Therefore, we examined the interaction between genetic and environmental risk factors in blood pressure traits using the genetic risk score (GRS). Two Korean community-based cohorts, Cohort I (KARE; N = 8,840) and Cohort II (CAVAS; N = 9,599), were used for this study, and GRSs were calculated from 42 GWAS single-nucleotide polymorphisms (SNPs) that were validated for their association in these cohorts. We calculated GRSs in both ways by considering the effect sizes of each SNP (weighted GRS) and not considering the effect sizes (unweighted GRS). The unweighted GRS was strongly associated with systolic blood pressure, diastolic blood pressure, and hypertension (p = 9.03 × 10 -47 , p = 9.41 × 10 -48 , and p = 3.22 × 10 -55 by meta-analysis, respectively) and the weighted GRS showed the similar results. The environmental factors of body mass index, waist circumference, and drinking status were significantly associated with blood pressure traits, and the interaction between these factors and GRSs were examined. However, no interactions were found with either the GRS or the individual SNPs considered for the GRS. Our findings show that it is challenging to find GRS-environment interactions regarding blood pressure traits.

KEYWORDS:

blood pressure; gene-environment interaction; genetic risk score; hypertension

PMID:
30770579
DOI:
10.1002/gepi.22195

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