Using the CC genotype as a reference point, there was no notable variation in GDM risk was observed across different FokI VDR genotypes, even after adjusting for vitamin D deficiency, HbA1c, fasting serum insulin, previous history of GDM, obesity, BMI, age, and family history of diabetes. The gene discussed is VDR; the disease is obesity due to melanocortin 4 receptor deficiency.