BMI: body mass index; GDM: gestational diabetes mellitus; HOMA-IR: homeostatic model assessment insulin resistance index; HDL: high-density lipoprotein; LDL: low-density lipoprotein; OGTT: oral glucose tolerance test; HbA1c: glycosylated hemoglobin; DLK1: delta-like 1; TSH: thyroid-stimulating hormone. The gene discussed is DLK1; the disease is gestational diabetes.