MRAP2 and obesity due to melanocortin 4 receptor deficiency: We identified 30 rare variants likely associated with obesity in 15 candidate genes (LEP, LEPR, POMC, MC3R, MC4R, MRAP2, SH2B1, BDNF, NTRK2, DYRK1B, SIM1, GNAS, ADCY3, RAI1, and BBS2) (Fig. 3A).