TCF7L2 and type 2 diabetes mellitus: Following the report of a strong association between type 2 diabetes and a microsatellite marker located within intron 3 of the transcription factor 7-like 2 gene (TCF7L2) locus (Grant et al., 2006), a single nucleotide polymorphism (SNP) (rs7903146 allele T) within this gene was found to be in linkage disequilibrium with the said marker.