In Japanese populations, the gestational-diabetes-related loci include adiponectin (ADIPOQ), CDKN2A/2B, signal sequence receptor subunit 1-Ras-responsive element binding protein 1 (SSR1-RREB1), and MyoD family inhibitor domain-containing 2 (MDFIC2) [20,21]. Here, RREB1 is linked to gestational diabetes.