We first performed association analyses of the two genetic polymorphisms in GDM and non-GDM subjects to determine whether these polymorphisms were associated with a higher risk of developing GDM, which were previously found to be associated with T2DM (rs1387153 and rs10830963 on MTNR1B), with the risk of GDM (Table 2). Here, MTNR1B is linked to type 2 diabetes mellitus.