KCNQ2 and Okur-Chung neurodevelopmental syndrome: Phosphorylation of S839 by CK2 is essential for the accumulation of KCNQ2 in the axon through interaction with AnkG (Kang et al., 2014; Xu and Cooper, 2015) and a loss of this accumulation could be relevant to the pathology of OCNDS patients possessing the CK2K198R mutation.