Identifying mutation hotspots reveals pathogenetic mechanisms of KCNQ2 epileptic encephalopathy.

ABSTRACT: K_v7 channels are enriched at the axonal plasma membrane where their voltage-dependent potassium currents suppress neuronal excitability. Mutations in K_v7.2 and K_v7.3 subunits cause epileptic encephalopathy (EE), yet the underlying pathogenetic mechanism is unclear. Here, we used novel statistical algorithms and structural modeling to identify EE mutation hotspots in key functional domains of K_v7.2 including voltage sensing S4, the pore loop and S6 in the pore domain, and intracellular calmodulin-binding helix B and helix B-C linker. Characterization of selected EE mutations from these hotspots revealed that L203P at S4 induces a large depolarizing shift in voltage dependence of K_v7.2 channels and L268F at the pore decreases their curre

SUBMITTER: Zhang J 

PROVIDER: S-EPMC7075958 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature