Site-specific Mtm1 mutagenesis by an AAV-Cre vector reveals that myotubularin is essential in adult muscle.

Abstract:

:Manipulation of the mouse genome by site-specific mutagenesis has been extensively used to study gene function and model human disorders. Mouse models of myotubular myopathy (XLMTM), a severe congenital muscular disorder due to loss-of-function mutations in the MTM1 gene, have been generated by homologous recombination and shown that myotubularin is essential for skeletal muscle. However, since the Mtm1 deletion occurred constitutively or shortly after birth in these mice, it is not known whether myotubularin is required during adulthood, an important issue in the context of not only muscle biology but also therapies. To delete the Mtm1 gene in adult muscle fibers, we constructed a recombinant adeno-associated vector (AAV) that expresses the Cre recombinase under the muscle-specific desmin promoter. We report that a single injection of this vector into muscles of 3-month-old Mtm1 conditional mice leads to a myotubular myopathy phenotype with myofiber atrophy, disorganization of organelle positioning, such as mitochondria and nuclei, T-tubule defects and severe muscle weakness. In addition, our results show that MTM1-related atrophy and dysfunction correlate with abnormalities in satellite cell number and markers of autophagy, protein synthesis and neuromuscular junction transmission. The expression level of atrogenes was also analyzed. Therefore, we provide a valuable tissue model that recapitulates the main features of the disease, and it is useful to study pathogenesis and evaluate therapeutic strategies. We establish the proof-of-concept that myotubularin is required for the proper function of skeletal muscle during adulthood, suggesting that therapies will be required for the entire life of XLMTM patients.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Joubert R,Vignaud A,Le M,Moal C,Messaddeq N,Buj-Bello A

doi

10.1093/hmg/ddt038

subject

Has Abstract

pub_date

2013-05-01 00:00:00

pages

1856-66

issue

9

eissn

0964-6906

issn

1460-2083

pii

ddt038

journal_volume

22

pub_type

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