DNA was isolated using the Invisorb® Blood Universal Kit from Stratec Molecular (Berlin, Germany). Eleven well-known T2DM genetic risk variants were genotyped: TCF7L2(rs7903146), PPARG-P12A(rs1801282), DUSP9(rs594532), CENTD2(rs1552224), THADA(rs7578597), HHEX(rs1111875), CDKAL1(rs7754840) and KCNQ1(rs231362)which had previously been genotyped for replication in DIAGRAM [37 (link)], and KCNJ11(rs5219), IGF2BP2(rs4402960) and FTO(rs8050136). These risk variants were chosen because of their relatively large effect sizes on T2DM risk in previous studies [32 (link), 37 (link)–42 (link)]. Genotyping was performed with TaqMan allelic discrimination assays, designed and optimized by Applied Biosystems (Foster City, CA, USA). Reactions were performed on the Taqman Prism 7900 HT platform.
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