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Inherited peripheral neuropathy.

M P Keller1, P F Chance

  • 1Department of Pediatrics, University of Washington School of Medicine, Seattle 98195-6320, USA.

Seminars in Neurology
|March 15, 2000
PubMed
Summary
This summary is machine-generated.

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Charcot-Marie-Tooth (CMT) disorders are inherited peripheral nerve diseases. CMT type 1 involves demyelination, while CMT type 2 affects axons, with genetic causes identified for several subtypes.

Area of Science:

  • Neurology
  • Genetics
  • Molecular Biology

Background:

  • Hereditary neuropathies encompass a spectrum of peripheral nerve disorders.
  • Charcot-Marie-Tooth neuropathy (CMT) is a common group, with CMT type 1 (CMT1) characterized by demyelination and CMT type 2 (CMT2) by axonal loss.

Purpose of the Study:

  • To review the genetic heterogeneity and molecular underpinnings of various CMT subtypes.
  • To differentiate between demyelinating (CMT1) and axonal (CMT2) forms of hereditary neuropathies.

Main Methods:

  • Review of genetic loci and mutations associated with CMT1A, CMT1B, CMT1C, and X-linked CMT (CMTX).
  • Analysis of genetic mapping for CMT2 subtypes (CMT2A, CMT2B, CMT2D).
  • Examination of molecular defects in Dejerine-Sottas disease (DSD) and hereditary neuropathy with liability to pressure palsies (HNPP).

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Main Results:

  • CMT1A is linked to 17p11.2-12 duplication or PMP22 mutations; CMT1B to MPZ mutations.
  • CMTX is associated with connexin32 mutations.
  • HNPP results from PMP22 deletion, a reciprocal event to CMT1A duplication.

Conclusions:

  • Hereditary neuropathies exhibit significant genetic diversity.
  • Specific gene mutations (PMP22, MPZ, EGR2, GJB1) and chromosomal abnormalities underlie different CMT subtypes.
  • Understanding these genetic bases is crucial for diagnosis and potential therapeutic strategies.