MTNR1B and gestational diabetes: We reported a preponderant effect of the rs10830963/G risk allele of the Melatonin Receptor 1B (MTNR1B) gene on GDM development [11] (odds ratios [OR] = 1.84/1.64 [95% CI:1.54–2.21/1.38–1.97] depending on the GDM diagnostic criteria [IADPSG/m99′WHO]).