False Appearance of Gene-Environment Interactions in Genetic Association Studies.

Abstract:

:Under the assumption of gene-environment independence, unknown/unmeasured environmental factors, irrespective of what they may be, cannot confound the genetic effects. This may lead many people to believe that genetic heterogeneity across different levels of the studied environmental exposure should only mean gene-environment interaction--even though other environmental factors are not adjusted for. However, this is not true if the odds ratio is the effect measure used for quantifying genetic effects. This is because the odds ratio is a "noncollapsible" measure--a marginal odds ratio is not a weighted average of the conditional odds ratios, but instead has a tendency toward the null. In this study, the authors derive formulae for gene-environment interaction bias due to noncollapsibility. They use computer simulation and real data example to show that the bias can be substantial for common diseases. For genetic association study of nonrare diseases, researchers are advised to use collapsible measures, such as risk ratio or peril ratio.

journal_name

Medicine (Baltimore)

journal_title

Medicine

authors

Su YS,Lee WC

doi

10.1097/MD.0000000000002743

subject

Has Abstract

pub_date

2016-03-01 00:00:00

pages

e2743

issue

9

eissn

0025-7974

issn

1536-5964

pii

00005792-201603010-00014

journal_volume

95

pub_type

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