Hot-spot residue in small heat-shock protein 22 causes distal motor neuropathy
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Open Access
- 2 May 2004
- journal article
- letter
- Published by Springer Nature in Nature Genetics
- Vol. 36 (6) , 597-601
- https://doi.org/10.1038/ng1328
Abstract
Distal hereditary motor neuropathies are pure motor disorders of the peripheral nervous system resulting in severe atrophy and wasting of distal limb muscles1. In two pedigrees with distal hereditary motor neuropathy type II linked to chromosome 12q24.3, we identified the same mutation (K141N) in small heat-shock 22-kDa protein 8 (encoded by HSPB8; also called HSP22). We found a second mutation (K141E) in two smaller families. Both mutations target the same amino acid, which is essential to the structural and functional integrity of the small heat-shock protein αA-crystallin2. This positively charged residue, when mutated in other small heat-shock proteins, results in various human disorders3,4. Coimmunoprecipitation experiments showed greater binding of both HSPB8 mutants to the interacting partner HSPB1. Expression of mutant HSPB8 in cultured cells promoted formation of intracellular aggregates. Our findings provide further evidence that mutations in heat-shock proteins have an important role in neurodegenerative disorders.Keywords
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