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- W2620908531 abstract "Mendelian randomization (MR) is an increasingly common tool that involves the use of genetic variants to evaluate causal relationships between exposures and outcomes. In this Review, Holmes et al. describe some of the scenarios in which findings from MR analyses can be challenging to evaluate, using examples from studies on cardiometabolic diseases. 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." @default.
- W2620908531 created "2017-06-09" @default.
- W2620908531 creator A5013184354 @default.
- W2620908531 creator A5055374455 @default.
- W2620908531 creator A5078073418 @default.
- W2620908531 date "2017-06-01" @default.
- W2620908531 modified "2023-10-18" @default.
- W2620908531 title "Mendelian randomization in cardiometabolic disease: challenges in evaluating causality" @default.
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