KCNJ8 and overnutrition: Nevertheless, while postnatal undernutrition suppresses the genes coding for the KATP channel subunits Sur2, Kir6.1 and Kir6.2 at postnatal day 30 [23], our data show that postnatal overnutrition, in turn, led to increased expression of genes coding for Sur1 (Abcc8) and Kir6.2 (Kcnj11) at prepubertal stage.