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Caused by mutation in the connexin-32 gene (GJB1, 304040.0001) [MOLECULAR BASIS] Usually begins in feet and legs (peroneal distribution) [MISCELLANEOUS] Heterozygous females more mildly affected than hemizygous males [MISCELLANEOUS] Variable phenotype [MISCELLANEOUS] Slow progression [MISCELLANEOUS] Incomplete penetrance [MISCELLANEOUS] Onset in childhood [MISCELLANEOUS] Both demyelinating and axonal features [MISCELLANEOUS] Upper limb involvement occurs later [MISCELLANEOUS]
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