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

Anna Lehman, Samrat Thouta, Grazia M.S. Mancini, Sakkubai Naidu, Marjon van Slegtenhorst, Kirsty McWalter, Richard Person, Jill Mwenifumbo, Ramona Salvarinova, Ilaria Guella, Marna B. McKenzie, Anita Datta, Mary B. Connolly, Somayeh Mojard Kalkhoran, Damon Poburko, Jan M. Friedman, Matthew J. Farrer, Michelle Demos, Sonal Desai, Thomas Claydon

Research output: Contribution to journalArticle

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)
JournalAmerican Journal of Human Genetics
DOIs
StateAccepted/In press - 2017

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Keywords

  • Epilepsy
  • Epileptic encephalopathy
  • Intellectual disability
  • KCNQ5
  • Kv7.5
  • Potassium channels

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

Cite this

Lehman, A., Thouta, S., Mancini, G. M. S., Naidu, S., van Slegtenhorst, M., McWalter, K., Person, R., Mwenifumbo, J., Salvarinova, R., Guella, I., McKenzie, M. B., Datta, A., Connolly, M. B., Kalkhoran, S. M., Poburko, D., Friedman, J. M., Farrer, M. J., Demos, M., Desai, S., & Claydon, T. (Accepted/In press). Loss-of-Function and Gain-of-Function Mutations in KCNQ5 Cause Intellectual Disability or Epileptic Encephalopathy. American Journal of Human Genetics. https://doi.org/10.1016/j.ajhg.2017.05.016