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.