Penetrance of the hereditary motor and sensory neuropathy Ia mutation: Assessment by nerve conduction studies

G. A. Nicholson*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)

Abstract

The clinical expression of hereditary motor and sensory neuropathy type I (HMSN I) is age-dependent. Autosomal dominant HMSN I is heterogeneous at a molecular level with genes localized on chromosomes 1,17, and possibly other chromosomes. In order to define accurately the penetrance of a single HMSN I gene mutation, we performed nerve conduction studies in HMSN I families whose genetic defect was linked to chromosome 17 (HMSN la). All HMSN la subjects tested had slow nerve conduction velocities with a mean median velocity 20 ± 6 m/sec, which did not change with age. The range of conduction velocities from affected individuals did not overlap those from their clinically normal relatives, indicating complete penetrance of the gene from early childhood. The results indicate that motor nerve conduction studies in children can add additional information for linkage studies and genetic counseling.

Original languageEnglish
Pages (from-to)547-552
Number of pages6
JournalNeurology
Volume41
Issue number4
Publication statusPublished - 1991
Externally publishedYes

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