ZFIN ID: ZDB-PUB-090914-39
The zebrafish dystrophic mutant softy maintains muscle fibre viability despite basement membrane rupture and muscle detachment
Jacoby, A.S., Busch-Nentwich, E., Bryson-Richardson, R.J., Hall, T.E., Berger, J., Berger, S., Sonntag, C., Sachs, C., Geisler, R., Stemple, D.L., and Currie, P.D.
Date: 2009
Source: Development (Cambridge, England) 136(19): 3367-3376 (Journal)
Registered Authors: Berger, Joachim, Bryson-Richardson, Robert, Busch-Nentwich, Elisabeth, Currie, Peter D., Geisler, Robert, Hall, Thomas, Jacoby, Arie, Sachs, Caroline, Sonntag, Carmen, Stemple, Derek L.
Keywords: Skeletal muscle, Zebrafish, Laminin β2, Basement membrane, Muscular dystrophy
MeSH Terms: Amino Acid Sequence; Animals; Animals, Genetically Modified; Base Sequence; Basement Membrane/pathology (all 23) expand
PubMed: 19736328 Full text @ Development
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ABSTRACT
The skeletal muscle basement membrane fulfils several crucial functions during development and in the mature myotome and defects in its composition underlie certain forms of muscular dystrophy. A major component of this extracellular structure is the laminin polymer, which assembles into a resilient meshwork that protects the sarcolemma during contraction. Here we describe a zebrafish mutant, softy, which displays severe embryonic muscle degeneration as a result of initial basement membrane failure. The softy phenotype is caused by a mutation in the lamb2 gene, identifying laminin beta2 as an essential component of this basement membrane. Uniquely, softy homozygotes are able to recover and survive to adulthood despite the loss of myofibre adhesion. We identify the formation of ectopic, stable basement membrane attachments as a novel means by which detached fibres are able to maintain viability. This demonstration of a muscular dystrophy model possessing innate fibre viability following muscle detachment suggests basement membrane augmentation as a therapeutic strategy to inhibit myofibre loss.
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