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 Genetjournal_title
Nature geneticsauthors
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 Ddoi
10.1038/ng1333keywords:
subject
Has Abstractpub_date
2004-04-01 00:00:00pages
388-93issue
4eissn
1061-4036issn
1546-1718pii
ng1333journal_volume
36pub_type
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