Mutation screening of Cx32 in Han Chinese patients with Charcot-Marie-Tooth disease.
OBJECTIVE
To investigate the Cx32 mutation features and the clinical manifestations of Chinese patients with Charcot-Marie-Tooth disease(CMT).


METHODS
Twenty-four of 65 unrelated CMT patients were selected for Cx32 mutation screening after the exclusion of the CMT1A 1.5 Mb duplication and male-to-male transmission. The motor and sensory nerve conduction studies were performed in all probands and most of their affected family members to establish the clinical CMT1 ,CMT2 or CMT intermediate diagnosis. The presence of mutations in the coding region of Cx32 was detected by single-strand conformation polymorphism analysis combined with direct sequencing.


RESULTS
We found 7 different point mutations in the coding region of Cx32 in a total of 7 families. All the patients were mildly to moderately affected with a clinical CMT1 or CMT intermediate diagnosis. The mutation Arg15Gln was inherited with X-linked recessive trait in family 1 involved in our study. The Arg75Trp mutation was detected in a family with X-linked dominant CMT and autosomal recessive nonsydromic hearing loss. The clinical phenotype of the Thr188Ala mutation was firstly reported.


CONCLUSIONS
Seven different Cx32 point mutations were detected and the percentage of Chinese CMT families with Cx32 mutation is about 10% in our study. The inheritance model of CMT secondary to Cx32 mutation could be X-linked dominant, X-linked recessive or sporadic. Male patients are usually more severely affected than females with slower nerve conduction velocities. Cx32 mutation screening should be firstly performed in those CMT families without male-to-male transmission and CMT1A duplication.
Zhang
Ru-xu
RX
Department of Neurology, Xiangya Hospital, Changsha 410008, China.
Luo
Wei
W
Zi
Xiao-hong
XH
Xia
Kun
K
Cai
Fang
F
Xiao
Jian-feng
JF
Zhao
Guo-hua
GH
Zhang
Fu-feng
FF
Shen
Lu
L
Jiang
Hong
H
Tang
Bei-sha
BS
D002607:Charcot-Marie-Tooth Disease / Q000235:genetics*; D002681:China / Q000208:ethnology; D041321:Chromosomes, Human, X / Q000235:genetics*; D017630:Connexins / Q000235:genetics*; D005260:Female; D006801:Humans; D008297:Male; D016366:Open Reading Frames / Q000235:genetics; D010375:Pedigree; D017354:Point Mutation; D000097002:Gap Junction beta-1 Protein
D017630:Connexins; D000097002:Gap Junction beta-1 Protein