Journal
DEVELOPMENTAL BIOLOGY
Volume 309, Issue 1, Pages 113-125Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ydbio.2007.06.024
Keywords
muscle; fusion; Drosophila; founder cell; fusion competent myoblast
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Funding
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM078318, R01GM056989] Funding Source: NIH RePORTER
- NIGMS NIH HHS [R01 GM056989-04, R01 GM078318, GM 586989, R01 GM056989-05, R01 GM056989-06A2, R01 GM056989-07, GM78318, R01 GM056989-01A1, R01 GM078318-01A1, R01 GM056989-03, R01 GM056989-02, R01 GM056989, R01 GM078318-02] Funding Source: Medline
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Formation of the Drosophila larval body wall muscles requires the specification, coordinated cellular behaviors and fusion of two cell types: Founder Cells (FCs) that control the identity of the individual muscle and Fusion Competent Myoblasts (FCMs) that provide mass. These two cell types come together to control the final size, shape and attachment of individual muscles. However, the spatial arrangement of these cells over time, the sequence of fusion events and the contribution of these cellular relationships to the fusion process have not been addressed. We analyzed the three-dimensional arrangements of FCs and FCMs over the course of myoblast fusion and assayed whether these issues impact the process of myoblast fusion. We examined the timing of the fusion process by analyzing the fusion profile of individual muscles in wild type and fusion mutants. We showed that there are two temporal phases of myoblast fusion in wild type embryos. Limited fusion events occur during the first 3 h of fusion, while the majority of fusion events occur in the remaining 2.5 h. Altogether, our data have led us to propose a new model of myoblast fusion where the frequency of myoblast fusion events may be influenced by the spatial arrangements of FCs and FCMs. (c) 2007 Elsevier Inc. All rights reserved.
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