Abstract:
BACKGROUND:Graves' disease is a female preponderant autoimmune illness and the contribution of the X chromosome to its risk has long been appreciated. However, no X-linked susceptibility loci have been indentified from recent genome-wide association studies (GWAS). METHODS:We re-examined the X chromosome data from our recent GWAS for Graves' disease by including males that were previously excluded from the X chromosome analyses. The data were analysed using logistic regression analysis including sex as a covariate, and an additive method assuming X chromosome inactivation, implemented in snpMatrix. RESULTS:A cluster of single nucleotide polymorphism (SNPs) at Xq21.1 was found showing association with genome-wide significance, among which rs3827440 was a non-synonymous SNP of GPR174 (P(logistic regression)= 9.52×10(-8); P(snpMatrix)=4.60×10(-9); OR=1.76, 95% CI 1.45 to 2.13). The association was reproduced in an independent sample collection set including 4564 Graves' disease cases and 3968 sex matched controls (combined P(logistic regression)=5.53×10(-21); combined P(snpMatrix)=4.26×10(-22); OR=1.69, 95% CI 1.53 to 1.86). Notably, GPR174 was widely expressed in immune related tissues and rs3827440 genotypes were associated with distinct mRNA levels (p=0.002). GPR174 did not show sex biased gene expression in our expression analysis. Resequencing study suggested the contribution of some rare variants in the GPR174 gene region to disease risk with a collapsing p value of 1.16×10(-3). CONCLUSIONS:The finding of an X-linked risk locus for Graves' disease expands our understanding of the role of the X chromosome in disease susceptibility.
journal_name
J Med Genetjournal_title
Journal of medical geneticsauthors
Chu X,Shen M,Xie F,Miao XJ,Shou WH,Liu L,Yang PP,Bai YN,Zhang KY,Yang L,Hua Q,Liu WD,Dong Y,Wang HF,Shi JX,Wang Y,Song HD,Chen SJ,Chen Z,Huang Wdoi
10.1136/jmedgenet-2013-101595subject
Has Abstractpub_date
2013-07-01 00:00:00pages
479-85issue
7eissn
0022-2593issn
1468-6244pii
jmedgenet-2013-101595journal_volume
50pub_type
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