Document Detail

MyoD and Myogenin expression during myogenic phases in brown trout: a precocious onset of mosaic hyperplasia is a prerequisite for fast somatic growth.
MedLine Citation:
PMID:  17315228     Owner:  NLM     Status:  MEDLINE    
Muscle cell recruitment (hyperplasia) during myogenesis in the vertebrate embryo is known to occur in three consecutive phases. In teleost fish (including zebrafish), however, information on myogenic precursor cell activation is largely fragmentary, and comprehensive characterization of the myogenic phases has only been fully undertaken in a single slow-growing cyprinid species by examination of MEF2D expression. Here, we use molecular techniques to provide a comprehensive characterization of MyoD and Myogenin expression during myogenic cell activation in embryos and larvae of brown trout, a fast-growing salmonid with exceptionally large embryos. Results confirm the three-phase pattern, but also demonstrate that the second and third phases begin simultaneously and progress vigorously, which is different from the previously described consecutive activation of these phases. Furthermore, we suggest that Pax7 is expressed in myogenic progenitor cells that account for second- and third-phase myogenesis. These findings are discussed in relation to teleost myotome development and to teleost growth strategies.
P Steinbacher; J R Haslett; A Obermayer; J Marschallinger; H C Bauer; A M Sänger; W Stoiber
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Developmental dynamics : an official publication of the American Association of Anatomists     Volume:  236     ISSN:  1058-8388     ISO Abbreviation:  Dev. Dyn.     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-04-30     Completed Date:  2007-07-30     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9201927     Medline TA:  Dev Dyn     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1106-14     Citation Subset:  IM    
Division of Zoology and Functional Anatomy, Department of Organismic Biology, University of Salzburg, Salzburg, Austria.
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MeSH Terms
Cell Proliferation*
Embryo, Nonmammalian
Gene Expression Regulation, Developmental
Muscle Development / genetics*
Muscle Fibers, Skeletal / cytology
MyoD Protein / genetics*,  metabolism
Myogenin / genetics*,  metabolism
Myosin Heavy Chains / genetics,  metabolism
Trout / embryology*,  genetics*
Reg. No./Substance:
0/MyoD Protein; 0/Myogenin; 0/Myosin Heavy Chains

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