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Effector caspase Dcp-1 and IAP protein Bruce regulate starvation-induced autophagy during Drosophila melanogaster

Ying-Chen Claire Hou1, Suganthi Chittaranjan, Sharon González Barbosa

  • 1The Genome Sciences Centre, British Columbia Cancer Research Centre, Vancouver, British Columbia V5Z 1L3, Canada.

The Journal of Cell Biology
|September 17, 2008
PubMed

Insights

This study reveals that cell death genes and signaling pathways regulate autophagy in Drosophila. Autophagy partially contributes to cell death during oogenesis, highlighting coordinated regulation of cell death and autophagy.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The interplay between autophagy and apoptosis is complex and not fully understood.
  • Regulatory mechanisms governing the interaction between these two cell death pathways remain largely unknown.

Purpose of the Study:

  • To systematically investigate the role of cell death-related genes in regulating starvation-induced autophagy in Drosophila melanogaster.
  • To elucidate the molecular mechanisms coordinating autophagic and apoptotic processes in vivo.

Main Methods:

  • Systematic screening of Drosophila melanogaster cell death-related genes.
  • Analysis of gene function in cultured D. melanogaster cells and during oogenesis.
  • Investigating the impact of mutations in autophagy-related genes (Atg1, Atg7) on cell death markers.

Main Results:

  • Six cell death genes (Dcp-1, hid, Bruce, Buffy, debcl, p53) and Ras-Raf-MAPK pathway components regulate autophagy in D. melanogaster cells.
  • Autophagy is induced at specific nutrient-dependent checkpoints during oogenesis (germarium and mid-oogenesis).
  • The effector caspase Dcp-1 and inhibitor of apoptosis protein Bruce regulate both autophagy and starvation-induced cell death during oogenesis.
  • Mutations in Atg1 and Atg7 partially reduced DNA fragmentation in degenerating egg chambers, suggesting autophagy's role in ovarian cell death.

Conclusions:

  • Cell death genes and signaling pathways are critical regulators of autophagy in Drosophila.
  • Autophagy plays a partial role in ovarian cell death during oogenesis.
  • This study provides novel insights into the coordinated regulation of autophagy and apoptosis in vivo.

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