Assessing the impact of population stratification on genetic association studies.

Abstract:

:Population stratification refers to differences in allele frequencies between cases and controls due to systematic differences in ancestry rather than association of genes with disease. It has been proposed that false positive associations due to stratification can be controlled by genotyping a few dozen unlinked genetic markers. To assess stratification empirically, we analyzed data from 11 case-control and case-cohort association studies. We did not detect statistically significant evidence for stratification but did observe that assessments based on a few dozen markers lack power to rule out moderate levels of stratification that could cause false positive associations in studies designed to detect modest genetic risk factors. After increasing the number of markers and samples in a case-cohort study (the design most immune to stratification), we found that stratification was in fact present. Our results suggest that modest amounts of stratification can exist even in well designed studies.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Freedman ML,Reich D,Penney KL,McDonald GJ,Mignault AA,Patterson N,Gabriel SB,Topol EJ,Smoller JW,Pato CN,Pato MT,Petryshen TL,Kolonel LN,Lander ES,Sklar P,Henderson B,Hirschhorn JN,Altshuler D

doi

10.1038/ng1333

keywords:

subject

Has Abstract

pub_date

2004-04-01 00:00:00

pages

388-93

issue

4

eissn

1061-4036

issn

1546-1718

pii

ng1333

journal_volume

36

pub_type

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