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GTR Home > Conditions/Phenotypes > Neuropathy, congenital hypomyelinating, 2

Neuropathy, congenital hypomyelinating, 2

Summary

Congenital hypomyelinating neuropathy-2 is an autosomal dominant neurologic disorder characterized by early-onset hypotonia, severely delayed motor development, muscle weakness with areflexia, and severely decreased nerve conduction velocities (NCV) resulting from improper myelination of axons. The severity is variable: some patients may present at birth with contractures and respiratory insufficiency, whereas others may achieve walking (summary by Warner et al., 1996). CHN shows significant phenotypic overlap with Dejerine-Sottas syndrome (DSS; 145900), which is also a neuropathy with early onset. Some classify the disorders differently, noting that CHN is characterized by hypo- or amyelination resulting from a congenital defect in myelin formation, whereas DSS has features of continuous myelin breakdown, with demyelination and remyelination (summary by Smit et al., 2008). For a discussion of genetic heterogeneity of CHN, see CHN1 (605253). [from OMIM]

Available tests

8 tests are in the database for this condition.

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Clinical tests (8 available)

Molecular Genetics Tests

Genes See tests for all associated and related genes

  • Also known as: CHM, CHN2, CMT1, CMT1B, CMT2I, CMT2J, CMT4E, CMTDI3, CMTDID, DSS, HMSNIB, MPP, P0, MPZ
    Summary: myelin protein zero

Clinical features

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Imported from Human Phenotype Ontology (HPO)

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