Mutilating neuropathic ulcerations in a chromosome 3q13-q22 linked Charcot-Marie-Tooth disease type 2B family.

Background: Charcot-Marie-Tooth disease type 2 (CMT2) or hereditary motor and sensory neuropathy type II (HMSN II) is an inherited axonal neuropathy of the peripheral nervous system. Three autosomal dominant CMT2 loci have been located on chromosomes 1p35-p36 (CMT2A), 3q13-q22 (CMT2B), and 7p14 (CMT2D) indicating that CMT2 is a genetically heterogeneous disorder.

Methods: A CMT2 family was examined for linkage to the CMT2A, CMT2B, and CMT2D loci using short tandem repeat polymorphisms.

Further evidence supporting linkage of hereditary neuralgic amyotrophy to chromosome 17q.

Hereditary neuralgic amyotrophy is a rare autosomal dominant disorder of the peripheral nervous system. Previous segregation analysis in two large pedigrees suggested linkage to distal 17q. Linkage data obtained in the present study investigating a three generation pedigree confirm linkage to 17q24-q25.

Refinement of the hereditary neuralgic amyotrophy (HNA) locus to chromosome 17q24-q25.

Hereditary neuralgic amyotrophy (HNA) is an autosomal dominant, recurrent focal neuropathy characterized by episodes of painful brachial plexus neuropathy with muscle weakness and atrophy, as well as sensory disturbances. Single episodes are commonly preceded by unspecific infections or immunization, or are associated with parturition. Minor facial dysmorphic features are present in some pedigrees but do not clearly segregate with the disease.

Linkage and mutation analysis of Charcot-Marie-Tooth neuropathy type 2 families with chromosomes 1p35-p36 and Xq13.

A locus for autosomal dominant Charcot-Marie-Tooth disease type 2 (CMT2A) was assigned by linkage analysis to chromosome 1p35-p36. We examined 11 unrelated CMT2 families for linkage to CMT2A using short tandem repeat (STR) polymorphisms. Only one family showed suggestive evidence for linkage to 1p35-p36.