Growth in the larval zebrafish pectoral fin and trunk musculature
Article first published online: 15 DEC 2007
Copyright © 2007 Wiley-Liss, Inc.
Volume 237, Issue 2, pages 307–315, February 2008
How to Cite
Patterson, S. E., Mook, L. B. and Devoto, S. H. (2008), Growth in the larval zebrafish pectoral fin and trunk musculature. Dev. Dyn., 237: 307–315. doi: 10.1002/dvdy.21400
- Issue published online: 21 JAN 2008
- Article first published online: 15 DEC 2007
- Manuscript Accepted: 26 OCT 2007
- NIH: R01 HD37509. Grant Number: R01 HD044929
- fast muscle;
- slow muscle
After initial patterning, muscle in the trunk and fins of teleosts grows extensively. Here, we describe muscle growth in zebrafish, with emphasis on the pectoral fin musculature. In the trunk, slow muscle fibers differentiate first. In contrast, slow muscle does not appear in the pectoral fin until the beginning of the juvenile period. Mosaic hyperplasia contributes to trunk muscle growth, and new fibers are apparent within the muscle as early as 6 mm standard length. In the pectoral fin muscle, mosaic hyperplasia is not evident at any examined stage. Instead, the predominant mode of hyperplasia is stratified. In larval pectoral fin muscle new fibers appear subjacent to the skin, and this correlates with the expression of myogenic genes such as muscle regulatory factors and Pax7. Our results suggest that regulation of fiber type development and muscle growth may differ in the pectoral fin and trunk. Developmental Dynamics 237:307–315, 2008. © 2007 Wiley-Liss, Inc.