Since Kir6.2 is expressed in skeletal muscle, peripheral nerves, and the brain (Hattersley and Ashcroft 2005), specific KCNJ11 variants are associated with developmental delay and epilepsy, collectively known as developmental delay, epilepsy, and NDM (DEND) syndrome (Flanagan et al. 2006). This evidence concerns the gene KCNJ11 and Global developmental delay.