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Polymorphisms in the genomic region encoding B lymphoid tyrosine kinase (BLK) and family with sequence similarity 167, member A (FAM167A, also referred to as C8orf13) at 8p23.1 have been associated with systemic lupus erythematosus (SLE) in Caucasian1 2 and Asian3 4 populations. A recent genomewide study in a north American population showed new associations with rheumatoid arthritis (RA), among which was a single nucleotide polymorphism (SNP) rs2736340 in the intergenic region of BLK and FAM167A.5 In the HapMap Japanese samples (http://www.hapmap.org/index.html.ja), this SNP is in absolute linkage disequilibrium (r2=1) with rs13277113, previously associated with SLE.1,–,4 We have shown that the population frequency of the risk genotype rs13277113A/A and the OR for SLE …
Funding This work was supported by Grant-in-Aid for Scientific Research (B) from Japan Society for the Promotion of Science (JSPS), Health and Labour Science Research Grants from the Ministry of Health, Labour and Welfare of Japan, Japan Rheumatism Foundation, The Naito Foundation and Mitsubishi Pharma Research Foundation.
Competing interests None.
Ethics approval This study was conducted with the approval of the University of Tsukuba, Juntendo University and the University of Tokyo.
Provenance and peer review Not commissioned; externally peer reviewed.
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