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Objective  To determine the genetic cause of axonal Charcot-Marie-Tooth disease in a small family with 2 affected siblings, one of whom had cerebellar features on examination.    Methods  Whole-exome sequencing of genomic DNA and analysis for recessively inherited mutations; PCR-based messenger RNA/complementary DNA analysis of transcripts to characterize the effects of variants identified by exome sequencing.    Results  We identified compound heterozygous mutations in dystonin ( DST ), which is alternatively spliced to create many plakin family linker proteins (named the bullous pemphigoid antigen 1 [BPAG1] proteins) that function to bridge cytoskeletal filament networks. One mutation (c.250C&gt;T) is predicted to cause a nonsense mutation (p.R84X) that only affects isoform 2 variants, which have an N-terminal transmembrane domain; the other (c.8283+1G&gt;A) mutates a consensus splice donor site and results in a 22 amino acid in-frame deletion in the spectrin repeat domain of all BPAG1a and BPAG1b isoforms.    Conclusions  These findings introduce a novel human phenotype, axonal Charcot-Marie-Tooth, of recessive  DST  mutations, and provide further evidence that BPAG1 plays an essential role in axonal health.

Isoform-specific loss of dystonin causes hereditary motor and sensory neuropathy