CDKN2A and type 2 diabetes mellitus: There are many proposed theories such as polymorphisms in PPAR2, IGF2BP2, CDKL1 and CDKN2a in the quest to find a link between genetic factors and GDM.7 Many studies have linked T2DM with polymorphisms in KCNQ1 gene.16,11,13,19 but few with GDM.