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Phenotypic variability [MISCELLANEOUS] Variable age at onset (range birth to 60 years) [MISCELLANEOUS] Incomplete penetrance [MISCELLANEOUS] Clinical overlap with distal hereditary motor neuropathy type VII (dHMN VII, 158580) [MISCELLANEOUS] Earlier onset associated with increased severity [MISCELLANEOUS] Worsening of hand weakness with cold (in some) [MISCELLANEOUS] Caused by mutation in the transient receptor potential cation channel, subfamily V, member 4 gene (TRPV4, 605427.0008) [MOLECULAR BASIS]
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