title: Assessment of sex-specific effects in a genome-wide association study of rheumatoid arthritis.
abstract: Rheumatoid arthritis (RA) is three times more common in females than in males, suggesting that sex may play a role in modifying genetic associations with disease. We have addressed this hypothesis by performing sex-differentiated and sex-interaction analyses of a genome-wide association study of RA in a North American population. Our results identify a number of novel associations that demonstrate strong evidence of association in both sexes combined, with no evidence of heterogeneity in risk between males and females. However, our analyses also highlight a number of associations with RA in males or females only. These signals may represent true sex-specific effects, or may reflect a lack of power to detect association in the smaller sample of males, and thus warrant further investigation.
authors.affiliation: Genetic and Genomic Epidemiology Unit, Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, UK. zhuang@well.ox.ac.uk.
authors.forename: Joanna J
authors.initials: JJ
authors.lastname: Zhuang
authors.forename: Andrew P
authors.initials: AP
authors.lastname: Morris