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Distal hereditary motor neuropathies are pure motor disorders of the peripheral nervous system resulting in severe atrophy and wasting of distal limb muscles. 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 alphaA-crystallin. This positively charged residue, when mutated in other small heat-shock proteins, results in various human disorders. 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.

Original publication

DOI

10.1038/ng1328

Type

Journal article

Journal

Nat Genet

Publication Date

06/2004

Volume

36

Pages

597 - 601

Keywords

Amino Acid Sequence, Animals, COS Cells, Cell Line, Charcot-Marie-Tooth Disease, Female, Heat-Shock Proteins, Humans, Male, Molecular Sequence Data, Pedigree, Point Mutation, Protein-Serine-Threonine Kinases, Recombinant Proteins, Sequence Homology, Amino Acid, Transfection