The K-Cl cotransporter KCC3 is mutant in a severe peripheral neuropathy associated with agenesis of the corpus callosum

Heidi C. Howard, David B. Mount, Daniel Rochefort, Nellie Byun, Nicolas Dupré, Jianming Lu, Xuemo Fan, Luyan Song, Jean Baptiste Rivière, Claude Prévost, Jürgen Horst, Alessandro Simonati, Beate Lemcke, Rick Welch, Roger England, Frank Q. Zhan, Adriana Mercado, William B. Siesser, Alfred L. George, Michael P. McDonaldJean Pierre Bouchard, Jean Mathieu, Eric Delpire, Guy A. Rouleau*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

196 Scopus citations

Abstract

Peripheral neuropathy associated with agenesis of the corpus callosum (ACCPN) is a severe sensorimotor neuropathy associated with mental retardation, dysmorphic features and complete or partial agenesis of the corpus callosum. ACCPN is transmitted in an autosomal recessive fashion and is found at a high frequency in the province of Quebec, Canada. ACCPN has been previously mapped to chromosome 15q. The gene SLC12A6 (solute carrier family 12, member 6), which encodes the K+-Cl- transporter KCC3 and maps within the ACCPN candidate region, was screened for mutations in individuals with ACCPN. Four distinct protein-truncating mutations were found: two in the French Canadian population and two in non-French Canadian families. The functional consequence of the predominant French Canadian mutation (2436delG, Thr813fsX813) was examined by heterologous expression of wildtype and mutant KCC3 in Xenopus laevis oocytes; the truncated mutant is appropriately glycosylated and expressed at the cellular membrane, where it is non-functional. Mice generated with a targeted deletion of Slc12a6 have a locomotor deficit, peripheral neuropathy and a sensorimotor gating deficit, similar to the human disease. Our findings identify mutations in SLC12A6 as the genetic lesion underlying ACCPN and suggest a critical role for SLC12A6 in the development and maintenance of the nervous system.

Original languageEnglish (US)
Pages (from-to)384-392
Number of pages9
JournalNature Genetics
Volume32
Issue number3
DOIs
StatePublished - Nov 1 2002

ASJC Scopus subject areas

  • Genetics

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