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Title

Fhl1 W122S causes loss of protein function and late-onset mild myopathy

AuthorsEmmanuele, Valentina; Sánchez-Gutiérrez, Daniel ; Escudero, Luis M. ; Hirano, Michio
KeywordsMice mice
Phenotype
Myocardium
Kemizygosity
Knockin
Western blotting
Myopathy
Skeletal muscles
Heterozygote
Forelimb
Mutation
Issue Date30-Sep-2014
PublisherOxford University Press
CitationHuman Molecular Genetics 24(3): 714-726 (2014)
Abstract© The Author 2014. Published by Oxford University Press. All rights reserved. A member of the four-and-a-half-LIM (FHL) domain protein family, FHL1, is highly expressed in human adult skeletal and cardiac muscle. Mutations in FHL1 have been associated with diverse X-linked muscle diseases: scapuloperoneal (SP) myopathy, reducing body myopathy, X-linked myopathy with postural muscle atrophy, rigid spine syndrome (RSS) and Emery-Dreifuss muscular dystrophy. In 2008, we identified a missense mutation in the second LIM domain of FHL1 (c.365 G>C, p.W122S) in a family with SP myopathy. We generated a knock-in mouse model harboring the c.365 G>C Fhl1 mutation and investigated the effects of this mutation at three time points (3-5 months, 7-10 months and 18-20 months) in hemizygous male and heterozygous female mice. Survival was comparable in mutant and wild-type animals. We observed decreased forelimb strength and exercise capacity in adult hemizygous male mice starting from 7 to 10 months of age. Western blot analysis showed absence of Fhl1 in muscle at later stages. Thus, adult hemizygous male, but not heterozygous female, mice showed a slowly progressive phenotype similar to human patients with late-onset muscle weakness. In contrast to SP myopathy patients with the FHL1 W122S mutation, mutant mice did not manifest cytoplasmic inclusions (reducing bodies) in muscle. Because muscle weakness was evident prior to loss of Fhl1 protein and without reducing bodies, our findings indicate that loss of function is responsible for the myopathy in the Fhl1 W122S knock-in mice.
DescriptionEmmanuele, Valentina et al.
Publisher version (URL)http://doi.org/10.1093/hmg/ddu490
URIhttp://hdl.handle.net/10261/143167
DOI10.1093/hmg/ddu490
Identifierse-issn: 1460-2083
issn: 0964-6906
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