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Open AccessArticle

Distinct Fiber Type Signature in Mouse Muscles Expressing a Mutant Lamin A Responsible for Congenital Muscular Dystrophy in a Patient

1
Unité de Biologie Fonctionnelle et Adaptative (BFA), CNRS UMR 8251, Université Paris Diderot, Sorbonne Paris Cité, 75013 Paris, France
2
Biological Adaptation and Ageing, UMR CNRS 8256, Institut de Biologie Paris-Seine (IBPS), UPMC Univ Paris 06, Sorbonne Universités, 75005 Paris, France
*
Author to whom correspondence should be addressed.
Academic Editor: Thomas Dechat
Cells 2017, 6(2), 10; https://doi.org/10.3390/cells6020010
Received: 9 January 2017 / Revised: 14 April 2017 / Accepted: 20 April 2017 / Published: 24 April 2017
(This article belongs to the Collection Lamins and Laminopathies)
Specific mutations in LMNA, which encodes nuclear intermediate filament proteins lamins A/C, affect skeletal muscle tissues. Early-onset LMNA myopathies reveal different alterations of muscle fibers, including fiber type disproportion or prominent dystrophic and/or inflammatory changes. Recently, we identified the p.R388P LMNA mutation as responsible for congenital muscular dystrophy (L-CMD) and lipodystrophy. Here, we asked whether viral-mediated expression of mutant lamin A in murine skeletal muscles would be a pertinent model to reveal specific muscle alterations. We found that the total amount and size of muscle fibers as well as the extent of either inflammation or muscle regeneration were similar to wildtype or mutant lamin A. In contrast, the amount of fast oxidative muscle fibers containing myosin heavy chain IIA was lower upon expression of mutant lamin A, in correlation with lower expression of genes encoding transcription factors MEF2C and MyoD. These data validate this in vivo model for highlighting distinct muscle phenotypes associated with different lamin contexts. Additionally, the data suggest that alteration of muscle fiber type identity may contribute to the mechanisms underlying physiopathology of L-CMD related to R388P mutant lamin A. View Full-Text
Keywords: lamin A; congenital muscular dystrophy; muscle fiber type transition; myosin heavy chain IIA lamin A; congenital muscular dystrophy; muscle fiber type transition; myosin heavy chain IIA
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Barateau, A.; Vadrot, N.; Agbulut, O.; Vicart, P.; Batonnet-Pichon, S.; Buendia, B. Distinct Fiber Type Signature in Mouse Muscles Expressing a Mutant Lamin A Responsible for Congenital Muscular Dystrophy in a Patient. Cells 2017, 6, 10.

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