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Updated: Aug 4, 2026

Live-imaging of the Drosophila Pupal Eye
09:54

Live-imaging of the Drosophila Pupal Eye

Published on: January 12, 2015

Myoblast city, the Drosophila homolog of DOCK180/CED-5, is required in a Rac signaling pathway utilized for multiple

K M Nolan1, K Barrett, Y Lu

  • 1Massachusetts General Hospital Cancer Center and Harvard Medical School, Charlestown, Massachusetts 02129 USA.

Genes & Development
|November 10, 1998
PubMed

Insights

Myoblast city (mbc) is crucial for Rac GTPase signaling in Drosophila, regulating key developmental processes. This study identifies Mbc as a specific upstream regulator of Rac, essential for morphogenesis.

Area of Science:

  • Cellular signaling pathways
  • Developmental biology
  • GTPase regulation

Background:

  • Rac and Cdc42 GTPases have distinct functions despite shared regulators.
  • The molecular basis for GTPase specificity in vivo remains unclear.

Purpose of the Study:

  • To identify specific upstream regulators of Rac GTPase in Drosophila.
  • To elucidate the role of myoblast city (mbc) in embryonic development.

Main Methods:

  • Conducted a mutational screen in Drosophila to isolate Rac-specific signaling components.
  • Analyzed phenotypes of mbc mutant embryos.
  • Investigated the interaction between Mbc (DOCK180 homolog) and Rac/Cdc42.

Main Results:

  • Isolated 11 alleles of myoblast city (mbc).
  • mbc mutant embryos displayed defects in dorsal closure, myogenesis, and neural development.
  • Mammalian DOCK180 associated with Rac but not Cdc42, independent of nucleotide binding.

Conclusions:

  • Mbc acts as a specific upstream regulator for Rac GTPase.
  • Mbc mediates essential morphogenetic processes during Drosophila embryogenesis.

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