Abstract

Peripheral neuropathy with or without agenesis of the corpus callosum (ACCPN [MIM 2180000]) is an autosomal recessive disease characterised by progressive sensorimotor neuropathy, mental retardation, dysmorphic features and complete or partial agenesis of the corpus callosum. The ACCPN gene was mapped in 1996 to a 4 cM region on chromosome 15. We have since collected additional French Canadian (FC) families and typed a total of 11 polymorphic markers spanning approximately 18 cM on chromosome 15. Through the use of haplotype analysis we have confirmed the presence of a founder haplotype in the FC population, and identified critical recombinants which reduce the ACCPN candidate interval to a approximately 2 cM or 1000 Kb region flanked by markers D15S1040 and ACTC. Linkage disequilibrium analysis supports the haplotype data, and suggests that the ACCPN gene lies nearest to marker D15S1232.

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