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Control of G2/M transition by Drosophila Fos

Joogyung Hyun1, Isabelle Bécam, Constantin Yanicostas

  • 1Department of Biomedical Genetics, University of Rochester Medical Center, Rochester, NY 14642, USA.

Molecular and Cellular Biology
|September 13, 2006
PubMed

Insights

Fos transcription factors are crucial for cell cycle progression in Drosophila. Loss of Fos function specifically impairs the G2-to-M transition, impacting organ size by reducing mitosis.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Fos family transcription factors are linked to cell proliferation, but mechanisms remain unclear.
  • Understanding Fos's role in cell cycle and growth control is essential.

Purpose of the Study:

  • Investigate Fos's contribution to cell cycle and cell growth control.
  • Elucidate the molecular mechanisms underlying Fos-mediated proliferation control.

Main Methods:

  • Utilized Drosophila melanogaster imaginal discs as a model system.
  • Employed RNA interference (RNAi) to inhibit Fos expression.
  • Analyzed cell cycle progression and organ size defects.
  • Identified direct transcriptional targets of Fos using in vivo binding assays.

Main Results:

  • Fos inhibition caused a specific G2-to-M cell cycle transition defect.
  • Cell growth was unaffected, but organ size was significantly reduced.
  • Identified cyclin B as a direct transcriptional target of Fos.
  • Fos binds upstream of the cyclin B gene, and its loss reduces cyclin B mRNA levels.

Conclusions:

  • Fos is essential for regulating the G2-to-M cell cycle transition and mitosis.
  • Fos controls organ size by regulating cyclin B expression.
  • This study clarifies a key mechanism by which Fos family proteins regulate cell proliferation.

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