FTO and obesity due to melanocortin 4 receptor deficiency: In the study including 2386 individuals, De et al. analyzed interactions between twelve genetic variants robustly associated with obesity (BDNF, ETV5, FAIM2, FTO, GNPDA2, KCTD15, MC4R, MTCH2, NEGR1, SEC16B, SH2B1, and TMEM18).