Comparison of Clinical and Electrophysiological Characteristics between CMTX with Cx32 Missense Mutation and CMT1A with PMP22 Duplication.
- Author:
Byung Ok CHOI
1
;
Ki Wha CHUNG
;
Kee Duk PARK
;
Seung Min KIM
;
Sang Hee SHIN
;
Il Nam SUNWOO
Author Information
1. Department of Neurology, Ewha Womans University College of Medicine, Seoul, Korea.
- Publication Type:Original Article
- Keywords:
Charcot-Marei-Tooth disease;
Cx32;
PMP22;
CMTX;
Mutation
- MeSH:
Asian Continental Ancestry Group;
Axons;
Cranial Nerves;
Gene Duplication;
Humans;
Inheritance Patterns;
Mutation, Missense*;
Neural Conduction;
Neurologic Examination;
Point Mutation
- From:Journal of the Korean Neurological Association
2004;22(3):226-234
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND: Charcot-Marie-Tooth (CMT) disease is a clinically and genetically heterogeneous disorder. Connexin32 (Cx32) gene mutations on Xq13.1 cause the X-linked form of CMT disease, and PMP22 gene duplication on 17p11.2-p12 causes CMT1A. The aim of the present study is to determine the clinical and electrophysiological characteristics between X-linked CMT patients with Cx32 missense mutations and CMT1A patients with PMP22 duplications. METHODS: We screened for 17p11.2-p12 duplication, and for point mutations in Cx32 genes of 48 Korean CMT families. Both neurological examination and nerve conduction studies were performed in all patients. RESULTS: Frequency of CMTX (6.3%) in our study was similar to Japanese, and was lower than those in European peoples. CMTX patients displayed no man-to-man transmission, and had cranial nerve involvement. CMTX patients showed more wide range of motor and sensory nerve conduction velocities than CMT1A patients. We found one family with axonal neuropathy and two families with demyelinating neuropathy in CMTX patients. CONCLUSIONS: Our findings suggest that mutations in Cx32 are probably less frequent in Asian CMT patients than European patients, and CMTX neuropathy is intermediary between CMT1 and CMT2. In addition, inheritance pattern and cranial nerve involvement are useful in differentiating CMTX from CMT1A with duplication.
