Atypical phenotype of charcot-marie-tooth disease type 1A.

Abstract:

:Two sisters with a Charcot-Marie-Tooth disease type 1A (CMT1A) duplication, who had an unusual CMT1A clinical phenotype, are described. The 63-year-old proband presented with dysesthesia on the inner side of the right leg. Neurological examination revealed a localized sensory disturbance in the lower extremities and mild weakness in the feet and left hand. Her 61-year-old sister had experienced several episodes of acute paralysis, and neurological examination showed moderate, sensory-dominant polyneuropathy. A reduction of myelinated fibers with many onion-bulb formations were observed in the sural nerve of the proband, and electrophysiological studies showed reduced motor nerve conduction velocities in both sisters. To diagnose CMT1A, we developed a CMT1A duplication test based on detection of CMT1A-specific junction fragments using the long polymerase chain reaction (PCR) method. A 3.3-kb CMT1A-specific junction fragment was detected in both patients, and their neuropathy may therefore have been associated with CMT1A duplication.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Murakami T,Oomori H,Hara A,Uyama E,Mita S,Uchino M

doi

10.1002/(sici)1097-4598(199911)22:11<1593::aid-mus

subject

Has Abstract

pub_date

1999-11-01 00:00:00

pages

1593-6

issue

11

eissn

0148-639X

issn

1097-4598

pii

10.1002/(SICI)1097-4598(199911)22:11<1593::AID-MUS

journal_volume

22

pub_type

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