FTO and obesity due to melanocortin 4 receptor deficiency: The candidate genes were fat mass and obesity-associated (FTO), KCNJ11, potassium voltage-gated channel subfamily Q member 1 (KCNQ1), PDK4, PDX-1, paternally expressed gene-3 (PEG3), PPARG, and stearoyl-coenzyme A desaturase-1 (SCD1).