Loss-of-Function and Gain-of-Function Mutations in KCNQ5 Cause Intellectual Disability or Epileptic Encephalopathy

CAUSES Study

Research output: Contribution to journalArticlepeer-review

Abstract

KCNQ5 is a highly conserved gene encoding an important channel for neuronal function; it is widely expressed in the brain and generates M-type current. Exome sequencing identified de novo heterozygous missense mutations in four probands with intellectual disability, abnormal neurological findings, and treatment-resistant epilepsy (in two of four). Comprehensive analysis of this potassium channel for the four variants expressed in frog oocytes revealed shifts in the voltage dependence of activation, including altered activation and deactivation kinetics. Specifically, both loss-of-function and gain-of-function KCNQ5 mutations, associated with increased excitability and decreased repolarization reserve, lead to pathophysiology.

Original languageEnglish (US)
Pages (from-to)65-74
Number of pages10
JournalAmerican journal of human genetics
Volume101
Issue number1
DOIs
StatePublished - Jul 6 2017

Keywords

  • KCNQ5
  • Kv7.5
  • epilepsy
  • epileptic encephalopathy
  • intellectual disability
  • potassium channels

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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