Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Senderek, J; Hermanns, B; Bergmann, C; Boroojerdi, B; Bajbouj, M; Hungs, M; Ramaekers, VT; Quasthoff, S; Karch, D; Schröder, JM.
X-linked dominant Charcot-Marie-Tooth neuropathy: clinical, electrophysiological, and morphological phenotype in four families with different connexin32 mutations(1).
J Neurol Sci. 1999; 167(2):90-101
Doi: 10.1016/S0022-510X(99)00146-X
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- Co-Autor*innen der Med Uni Graz
- Quasthoff Stefan
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- Abstract:
- The sensorimotor neuropathy of the Charcot-Marie-Tooth type (CMT) is the most common hereditary disorder of the peripheral nervous system. The X-linked dominant form of CMT (CMTX) is associated with mutations in the gene for the gap junction protein connexin32. We examined four CMTX pedigrees two of which had potentially novel mutations in the only coding exon of connexin32. One previously unreported missense mutation, Ala39Val, was found in a family displaying a CMT phenotype with additional upper limb postural tremor reminiscent of a Roussy-Lévy syndrome. A novel single base insertion, 679insT, is among the first mutations found in the fourth transmembrane domain of connexin32. Frameshift and premature stop of translation are supposed to result in a non-functional carboxy-terminus. Two further families had the known missense mutations Arg15Trp and Arg22Gln. Several female carriers were found normal on clinical presentation, however, the genotype was paralleled by decreased nerve conduction velocities (NCV) and slowed central conduction of brain stem auditory evoked responses (BAER). Median motor NCVs showed mild (in women) to intermediate (in males) reduction, indicating a peripheral neuropathy with a predominating axonal component. Nerve biopsy findings were consistent with the electrophysiological data showing a marked loss of large myelinated fibres and clusters of regenerating axons. Electron microscopy revealed various alterations of the axoglial attachment zone. This suggests defective axon-Schwann cell interactions which may induce the axonopathy in CMTX.
- Find related publications in this database (using NLM MeSH Indexing)
- Adolescent -
- Adult -
- Biopsy -
- Charcot-Marie-Tooth Disease - genetics
- Child - genetics
- Chromosome Segregation - genetics
- Connexins - genetics
- Evoked Potentials, Auditory, Brain Stem - physiology
- Female - physiology
- Genes, Dominant - physiology
- Humans - physiology
- Linkage (Genetics) - physiology
- Male - physiology
- Middle Aged - physiology
- Mutation - physiology
- Pedigree - physiology
- Phenotype - physiology
- Sequence Analysis, DNA - physiology
- X Chromosome - physiology
- Find related publications in this database (Keywords)
- X-linked Charcot-Marie-Tooth neuropathy
- hereditary motor and sensory neuropathy
- Roussy-Levy syndrome
- connexin32 mutations