Cited by 679Genetic Associations and EpidemiologyNutrition, Genetics, and DiseaseGenetics and Physical Performance

Mendelian randomization in cardiometabolic disease: challenges in evaluating causality

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Holmes, Michael V., Ala-Korpela, Mika, Smith, George Davey·2017·Nature Reviews Cardiology

Abstract

Mendelian randomization (MR) is a burgeoning field that involves the use of genetic variants to assess causal relationships between exposures and outcomes. MR studies can be straightforward; for example, genetic variants within or near the encoding locus that is associated with protein concentrations can help to assess their causal role in disease. However, a more complex relationship between the genetic variants and an exposure can make findings from MR more difficult to interpret. In this Review, we describe some of these challenges in interpreting MR analyses, including those from studies using genetic variants to assess causality of multiple traits (such as branched-chain amino acids and risk of diabetes mellitus); studies describing pleiotropic variants (for example, C-reactive protein and its contribution to coronary heart disease); and those investigating variants that disrupt normal function of an exposure (for example, HDL cholesterol or IL-6 and coronary heart disease). Furthermore, MR studies on variants that encode enzymes responsible for the metabolism of an exposure (such as alcohol) are discussed, in addition to those assessing the effects of variants on time-dependent exposures (extracellular superoxide dismutase), cumulative exposures (LDL cholesterol), and overlapping exposures (triglycerides and non-HDL cholesterol). We elaborate on the molecular features of each relationship, and provide explanations for the likely causal associations. In doing so, we hope to contribute towards more reliable evaluations of MR findings.

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Authors
Holmes, M. V., Ala-Korpela, M., & Smith, G. D.
Affiliations
  • National Institute for Health and Care Research (GB)
  • University of Bristol (GB)
Corresponding author
Holmes, Michael V.
Venue
Nature Reviews Cardiology
Published
2017-06-01
Volume
14
Issue
10
Pages
577-590
ISSN
  • 1759-5002 (ISSN-L)
  • 1759-5010
OpenAlex
W2620908531
Cited by
679
References
159
Citations by year
2026: 35 · 2025: 77 · 2024: 123 · 2023: 96 · 2022: 74 · 2021: 91 · 2020: 64 · 2019: 57 · 2018: 45 · 2017: 17
FWCI
6.47
Type
journal article
Language
en
Locations
  • Nature Reviews Cardiology (publishedVersion)
  • PubMed (publishedVersion)
  • Explore Bristol Research (publishedVersion, other-oa)
  • PubMed Central (acceptedVersion)
  • Bristol Research (University of Bristol) (submittedVersion, other-oa)
Funders
  • University of Oxford
  • University of Bristol (MC_UU_12013/1)
  • Medical Research Council (MC_UU_12013, MCUU12013/1)
  • Biocenter, University of Oulu
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Nutrition, Genetics, and Disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Physical Performance
Keywords
Mendelian randomization, causality, cardiometabolic disease, pleiotropy, branched-chain amino acids, diabetes mellitus, C-reactive protein, coronary artery disease, HDL cholesterol, interleukin-6, alcohol metabolism, extracellular superoxide dismutase, LDL cholesterol, triglycerides, non-HDL cholesterol, genetic variants
MeSH terms
Coronary Disease, Humans, Cholesterol, HDL, Cholesterol, LDL, Risk Factors, Genetic Variation, Biomarkers, Genetic Predisposition to Disease, Multifactorial Inheritance, Polymorphism, Single Nucleotide, Mendelian Randomization Analysis

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