CNDP1 and type 2 diabetes mellitus: The CNDP1 locus, a postulated DN susceptibility locus found by positional cloning [5] and case control studies [10], has never been reported to be linked to DN in a GWAS approach, despite the fact that other genetic studies [11, 14, 33, 34] including a meta-analysis on 4546 DN, 7994 diabetes mellitus (DM), and 1826 healthy subjects [35] have confirmed an association between the CNDP1 (CTG)n polymorphism and DN in T2DM patients.