GLO1 and gestational diabetes: OR = 0.740; 95% CI: 0.548-0.999; P = 0.049) and the overdominant model (TG vs. TT+ GG: OR = 0.740; 95% CI: 0.548-0.998; P = 0.048) of GLO1 rs4746 significantly reduced the risk of GDM.