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WIP/WASp-based actin-polymerization machinery is essential for myoblast fusion in Drosophila

R'ada Massarwa1, Shari Carmon, Ben-Zion Shilo

  • 1Department of Molecular Genetics, Weizmann Institute of Science, 76100 Rehovot, Israel.

Developmental Cell
|April 11, 2007
PubMed

Insights

Drosophila myoblast fusion relies on D-WIP, a protein that links cell adhesion molecules to the actin-cytoskeleton. This connection is crucial for expanding fusion pores and membrane breakdown during muscle fiber formation.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Muscle development requires syncytial muscle fiber formation through myoblast fusion.
  • The WASp (Wiskott-Aldrich syndrome protein) family plays a role in actin nucleation and cell shape changes.

Purpose of the Study:

  • To investigate the role of D-WIP, a WASp-binding protein, in Drosophila myoblast fusion.
  • To elucidate the molecular mechanism by which D-WIP facilitates cell fusion.

Main Methods:

  • Utilized Drosophila embryos as a model system.
  • Investigated protein interactions using biochemical and genetic approaches.
  • Examined cellular processes like cell adhesion and membrane dynamics.

Main Results:

  • D-WIP is specifically expressed in myoblasts and is essential for myoblast fusion.
  • D-WIP bridges myoblast adhesion molecules (Dumbfounded, Sticks and Stones) with the WASp-Arp2/3 actin nucleation machinery.
  • This recruitment is critical for the late stages of fusion, including pore enlargement and membrane breakdown.

Conclusions:

  • D-WIP acts as a key mediator in myoblast fusion by connecting cell adhesion to actin polymerization.
  • The WASp-Arp2/3 pathway is essential for the cellular mechanics of cell fusion.
  • This study links actin dynamics to the process of cell fusion in muscle development.

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