RT Journal Article SR Electronic T1 Distal truncation of KCC3 in non–French Canadian HMSN/ACC families JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 1350 OP 1355 DO 10.1212/01.wnl.0000291779.35643.15 VO 69 IS 13 A1 Salin-Cantegrel, A. A1 Rivière, J. -B. A1 Dupré, N. A1 Charron, F. M. A1 Shekarabi, M. A1 Karéméra, L. A1 Gaspar, C. A1 Horst, J. A1 Tekin, M. A1 Deda, G. A1 Krause, A. A1 Lippert, M. M. A1 Willemsen, M. A.A.P. A1 Jarrar, R. A1 Lapointe, J. -Y. A1 Rouleau, G. A. YR 2007 UL http://n.neurology.org/content/69/13/1350.abstract AB Background: Hereditary motor and sensory neuropathy with agenesis of the corpus callosum (HMSN/ACC) is a severe and progressive autosomal recessive polyneuropathy. Mutations in the potassium-chloride cotransporter 3 gene (KCC3) were identified as responsible for HMSN/ACC in the French Canadian (FC) population. In the present study, the authors were interested in finding new mutations in non-FC populations, assessing the activity of mutant proteins and refining genotype-phenotype correlations. Methods: The authors screened KCC3 for mutations using direct sequencing in six non-FC HMSN/ACC families. They then assessed the functionality of the most common mutant protein using a flux assay in Xenopus laevis oocytes. Results: The authors identified mutations in exon 22 of KCC3: a novel mutation (del + 2994-3003; E1015X) in one family, as well as a known mutation (3031C→T; R1011X) found in five unrelated families and associated with two different haplotypes. The function of the cotransporter was abolished, although a limited amount of mutant proteins were correctly localized at the membrane. Conclusions: KCC3 mutations in exon 22 constitute a recurrent mutation site for hereditary motor and sensory neuropathy with agenesis of the corpus callosum (HMSN/ACC), regardless of ethnic origin, and are the most common cause of HMSN/ACC in the non–French Canadian (FC) families analyzed so far. Therefore, for genetic analysis, exon 22 screening should be prioritized in non-FC populations. Finally, the R1011X mutation leads to the abrogation of KCC3’s function in Xenopus laevis oocytes, likely due to impaired transit of the cotransporter. GLOSSARY: ANOVA = analysis of variance; CTD = C-terminal domain; FC = French Canadian population; HMSN/ACC = hereditary motor and sensory neuropathy with agenesis of the corpus callosum; KCC3 = potassium-chloride cotransporter 3; mut = mutated sequence; NGS = normal goat serum; RVD = regulatory volume decrease; WT = wild type sequence.