We previously reported that from a panel of 37 single nucleotide polymorphisms (SNP) commonly associated in GWAS of T2D in Europeans and Asians, only two SNPs in TCF7L2, rs7903146 and rs4506565 were associated with T2D in Qataris, suggesting that the genetic risks for T2D are different in Qataris compared to Europeans and Asians [7]. Here, TCF7L2 is linked to type 2 diabetes mellitus.