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Genetic variants of the transcription factor 7-like 2 (TCF7L2) gene affect the risk of type 2 diabetes in populations with multiple ethnic groups. However, a comprehensive survey of this gene has not been done for a Japanese population. Thus, we conducted this gene-based association study, in which the common genetic variants were analyzed. Using 24 Japanese type 2 diabetic subjects, we first screened a 9.5 kb region, which included the entire coding sequence, to assess potential functional variants of TCF7L2. Sequencing revealed a common coding variant (Pro477Thr) in exon 14 of TCF7L2 that was not enrolled in the public SNP database. Nineteen SNPs and the microsatellite DG10S478 were genotyped across the gene in 2,877 unrelated Japanese subjects. This independent screen identified the previously reported rs7903146 with a strongest association (allele P = 0.0001, odds ratio = 1.59 [95% confidence interval 1.25-2.01]), but there was no significant association between Pro477Thr and type 2 diabetes (allele P = 0.64). Expression of the Pro477Thr variant did not alter TCF7L2 expression in 30 lymphoblast cells. Although a genotypic effect of Pro477Thr on expression of TCF7L2 was not apparent, Pro477Thr was identified as a common variant of TCF7L2 in 2,877 Japanese subjects. Further functional studies are required to determine the possible effect of this coding variant on type 2 diabetes.

Common coding variant in the TCF7L2 gene and study of the association with type 2 diabetes in Japanese subjects