PUBLICATION
A conserved molecular pathway mediates myoblast fusion in insects and vertebrates
- Authors
- Srinivas, B.P., Woo, J., Leong, W.Y., and Roy, S.
- ID
- ZDB-PUB-070614-14
- Date
- 2007
- Source
- Nature Genetics 39(6): 781-786 (Journal)
- Registered Authors
- Leong, Wan Ying, Roy, Sudipto, Srinivas, B. P.
- Keywords
- none
- MeSH Terms
-
- RNA Probes
- Membrane Proteins/genetics
- Membrane Proteins/metabolism*
- Molecular Sequence Data
- Muscle Proteins/genetics
- Muscle Proteins/metabolism*
- Female
- Myoblasts/cytology
- Myoblasts/metabolism*
- Animals
- Cell Differentiation
- Microinjections
- Muscle Development
- Animals, Genetically Modified
- Muscles/embryology*
- Muscles/metabolism
- In Situ Hybridization
- Transcription, Genetic
- Zebrafish/genetics
- Zebrafish/growth & development
- Zebrafish/metabolism
- Zebrafish Proteins/genetics
- Zebrafish Proteins/metabolism*
- Drosophila Proteins/genetics
- Drosophila Proteins/metabolism*
- Green Fluorescent Proteins/genetics
- Embryo, Nonmammalian/cytology
- Embryo, Nonmammalian/metabolism*
- Drosophila melanogaster/genetics
- Drosophila melanogaster/growth & development
- Drosophila melanogaster/metabolism
- Cell Fusion*
- Signal Transduction*
- PubMed
- 17529975 Full text @ Nat. Genet.
Citation
Srinivas, B.P., Woo, J., Leong, W.Y., and Roy, S. (2007) A conserved molecular pathway mediates myoblast fusion in insects and vertebrates. Nature Genetics. 39(6):781-786.
Abstract
Skeletal muscles arise by fusion of precursor cells, myoblasts, into multinucleated fibers. In vertebrates, mechanisms controlling this essential step in myogenesis remain poorly understood. Here we provide evidence that Kirrel, a homolog of receptor proteins that organize myoblast fusion in Drosophila melanogaster , is necessary for muscle precursor fusion in zebrafish. Within developing somites, Kirrel expression localized to membranes of fusion-competent myoblasts of the fast-twitch lineage. Unlike wild-type myoblasts that form spatially arrayed syncytial (multinucleated) fast myofibers, those deficient in Kirrel showed a significant reduction in fusion capacity. Inhibition of Rac, a GTPase and the most downstream intracellular transducer of the fusion signal in D. melanogaster , also compromised fast-muscle precursor fusion in zebrafish. However, unlike in D. melanogaster , constitutive Rac activation in zebrafish led to hyperfused giant syncytia, highlighting an entirely new function for this protein in zebrafish for gating the number and polarity of fusion events. These findings uncover a substantial degree of evolutionary conservation in the genetic regulation of myoblast fusion.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping