Mutations in SLC12A5 in epilepsy of infancy with migrating focal seizures.

The potassium-chloride co-transporter KCC2, encoded by SLC12A5, plays a fundamental role in fast synaptic inhibition by maintaining a hyperpolarizing gradient for chloride ions. KCC2 dysfunction has been implicated in human epilepsy, but to date, no monogenic KCC2-related epilepsy disorders have been described. Here we show recessive loss-of-function SLC12A5 mutations in patients with a severe infantile-onset pharmacoresistant epilepsy syndrome, epilepsy of infancy with migrating focal seizures (EIMFS). Decreased KCC2 surface expression, reduced protein glycosylation and impaired chloride extrusion contribute to loss of KCC2 activity, thereby impairing normal synaptic inhibition and promoting neuronal excitability in this early-onset epileptic encephalopathy.

Citation

Tommy Stödberg, Amy McTague, Arnaud J Ruiz, Hiromi Hirata, Juan Zhen, Philip Long, Irene Farabella, Esther Meyer, Atsuo Kawahara, Grace Vassallo, Stavros M Stivaros, Magnus K Bjursell, Henrik Stranneheim, Stephanie Tigerschiöld, Bengt Persson, Iftikhar Bangash, Krishna Das, Deborah Hughes, Nicole Lesko, Joakim Lundeberg, Rod C Scott, Annapurna Poduri, Ingrid E Scheffer, Holly Smith, Paul Gissen, Stephanie Schorge, Maarten E A Reith, Maya Topf, Dimitri M Kullmann, Robert J Harvey, Anna Wedell, Manju A Kurian. Mutations in SLC12A5 in epilepsy of infancy with migrating focal seizures. Nature communications. 2015 Sep 03;6:8038

Mesh Tags

Substances

PMID: 26333769

search → result