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Laboratory for Neurogenetics, Flemish Institute for Biotechnology, Born Bunge Foundation, Department of Biochemistry, University of Antwerpen (UIA), Belgium (Dr. Timmerman) (Dr. De Jonghe) (Dr. Nelis) (Dr. Van Broeckhoven) (Mrs. Spoelders) (Simokovic) (Löfgren)
Division of Neurology, Duke University Medical Center, Durham, NC (Dr. Vance)
Laboratories for Neurology and Neuropathology, Born Bunge Foundation, Department of Medicine, University of Antwerpen (UIA), Belgium. (Dr. Martin)
Address correspondence and reprint requests to Dr. C. Van Broeckhoven, Laboratory of Neurogenetics; Born Bunge Foundation; University of Antwerpen (UIA); Department of Biochemistry: Universiteitsplein 1; B-2610 Antwerpen, Belgium.
A locus for autosomal dominant Charcot-Marie-Tooth disease type 2 (CMT2A) was assigned by linkage analysis to chromosome 1p35–p36. We examined 11 unrelated CMT2 families for linkage to CMT2A using short tandem repeat (STR) polymorphisms. Only one family showed suggestive evidence for linkage to 1p35–p36. Further, because of an overlap in electrophysiologic data between CMT2 and CMTX female patients, we screened 6 of 11 CMT2 families compatible with dominant X-linkage for mutations in the connexin 32 (Cx32) gene at Xq13. There was a Cx32 mutation in one family, whereas another family showed suggestive evidence for Xq13 linkage upon analysis with STR polymorphisms. Our results suggest that the CMT2A locus is a minor locus for CMT2, additional linkage studies are needed to localize other CMT2 loci, and Cx32 mutations may be the underlying genetic defect in some CMTS families.
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Supported in part by a grant of the National Fund for Scientific Research (NFSR), a concerted action of the Flemish Ministry of Education, Belgium and the Muscular Dystrophy Association, Tucson, AZ. V.T. and E.N. are research assistants of the NFSR, Belgium.
Received August 8, 1995. Accepted in final form September 8, 1995.
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