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Mutant lamins cause nuclear envelope rupture and DNA damage in skeletal muscle cells
Ist Teil von
Nature materials, 2020-04, Vol.19 (4), p.464-473
Ort / Verlag
London: Nature Publishing Group UK
Erscheinungsjahr
2020
Quelle
Springer Nature - Connect here FIRST to enable access
Beschreibungen/Notizen
Mutations in the
LMNA
gene, which encodes the nuclear envelope (NE) proteins lamins A/C, cause Emery–Dreifuss muscular dystrophy, congenital muscular dystrophy and other diseases collectively known as laminopathies. The mechanisms responsible for these diseases remain incompletely understood. Using three mouse models of muscle laminopathies and muscle biopsies from individuals with
LMNA
-related muscular dystrophy, we found that
Lmna
mutations reduced nuclear stability and caused transient rupture of the NE in skeletal muscle cells, resulting in DNA damage, DNA damage response activation and reduced cell viability. NE and DNA damage resulted from nuclear migration during skeletal muscle maturation and correlated with disease severity in the mouse models. Reduction of cytoskeletal forces on the myonuclei prevented NE damage and rescued myofibre function and viability in
Lmna
mutant myofibres, indicating that myofibre dysfunction is the result of mechanically induced NE damage. Taken together, these findings implicate mechanically induced DNA damage as a pathogenic contributor to
LMNA
skeletal muscle diseases.
Lamin mutations responsible for muscular dystrophy are shown to reduce nuclear envelope stability, resulting in mechanically induced nuclear envelope rupture, DNA damage and activation of DNA damage response pathways that lead to muscle cell death. Preventing nuclear envelope damage by reducing cytoskeletal forces on the nucleus improves muscle fibre health and function.