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Myostatin precursor is present in several tissues in teleost fish: a comparative immunolocalization study
Giuseppe Radaelli1, Anthea Rowlerson, Francesco Mascarello
1Department of Experimental Veterinary Sciences, Faculty of Veterinary Medicine, University of Padua, Padua, Italy. giuseppe.radaelli@unipd.it
Cell and Tissue Research
|February 22, 2003
Summary
Myostatin, a key growth regulator, shows distinct expression patterns in fish larvae and adults across sea bream, sole, and zebrafish. These findings suggest unique evolutionary roles for myostatin in fish development compared to mammals.
Area of Science:
- Developmental Biology
- Comparative Physiology
- Molecular Endocrinology
Background:
- Myostatin is a crucial regulator of muscle growth.
- Understanding myostatin's role in fish development is important for comparative biology.
- Previous studies suggest divergent functions of myostatin in fish versus mammals.
Purpose of the Study:
- To investigate the spatiotemporal distribution of myostatin during the larval and postlarval development of three fish species: sea bream (Sparus aurata), sole (Solea solea), and zebrafish (Brachydanio rerio).
- To compare the expression patterns of myostatin in fish with those observed in mammals.
- To explore the evolutionary implications of myostatin expression in fish.
Main Methods:
- Immunohistochemistry was employed using antisera against a synthetic peptide of sea bream myostatin.
- The study examined larval, juvenile, and adult stages of sea bream, sole, and zebrafish.
- Expression patterns were analyzed across various tissues including muscle, skin, brain, gills, liver, pancreas, and the gastrointestinal tract.
Main Results:
- Strong myostatin immunoreactivity was consistently observed in red skeletal muscle of juvenile and adult sea bream, sole, and zebrafish.
- During larval development, significant myostatin staining was found in the skin and brain of sea bream and zebrafish, and in the liver and intestine of sole.
- Post-metamorphosis, myostatin expression extended to the esophagus, stomach, intestine, and renal tubules in sea bream, and the gastrointestinal tract and ovary in adult zebrafish.
Conclusions:
- Myostatin exhibits diverse expression patterns in fish, extending beyond skeletal muscle to various organs during development.
- The observed expression patterns support the hypothesis that fish myostatins have retained distinct functions compared to their mammalian counterparts.
- These findings highlight the divergent evolutionary trajectory of myostatin function following gene duplication events in vertebrates.