Abstract:
:Each skeletal muscle acquires its unique size before birth, when terminally differentiating myocytes fuse to form a defined number of multinucleated myofibres. Although mice in which the transcription factor Myogenin is mutated lack most myogenesis and die perinatally, a specific cell biological role for Myogenin has remained elusive. Here we report that loss of function of zebrafish myog prevents formation of almost all multinucleated muscle fibres. A second, Myogenin-independent, fusion pathway in the deep myotome requires Hedgehog signalling. Lack of Myogenin does not prevent terminal differentiation; the smaller myotome has a normal number of myocytes forming more mononuclear, thin, albeit functional, fast muscle fibres. Mechanistically, Myogenin binds to the myomaker promoter and is required for expression of myomaker and other genes essential for myocyte fusion. Adult myog mutants display reduced muscle mass, decreased fibre size and nucleation. Adult-derived myog mutant myocytes show persistent defective fusion ex vivo. Myogenin is therefore essential for muscle homeostasis, regulating myocyte fusion to determine both muscle fibre number and size.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Ganassi M,Badodi S,Ortuste Quiroga HP,Zammit PS,Hinits Y,Hughes SMdoi
10.1038/s41467-018-06583-6subject
Has Abstractpub_date
2018-10-12 00:00:00pages
4232issue
1issn
2041-1723pii
10.1038/s41467-018-06583-6journal_volume
9pub_type
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