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Loss of dE2F compromises mitochondrial function

Aaron M Ambrus1, Abul B M M K Islam, Katherine B Holmes

  • 1Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, Chicago, IL 60607, USA.

Developmental Cell
|November 30, 2013
PubMed

Insights

E2F/DP transcription factors regulate cell proliferation and apoptosis. This study reveals that Drosophila dDP mutants resist irradiation-induced apoptosis due to mitochondrial dysfunction, not a failure in the apoptotic program. This E2F/DP role in mitochondrial regulation is conserved in humans.

Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • E2F/DP transcription factors are crucial regulators of cell proliferation and apoptosis.
  • Understanding resistance to apoptosis is vital for cancer research and therapy development.

Purpose of the Study:

  • To investigate the mechanism behind the resistance of Drosophila dDP mutants to irradiation-induced apoptosis.
  • To elucidate the role of E2F/DP in regulating mitochondrial function and its connection to apoptosis.

Main Methods:

  • Utilized Drosophila melanogaster as a model organism.
  • Investigated the induction of the apoptotic transcriptional program in dDP mutants.
  • Assessed mitochondrial function in dDP mutants.
  • Analyzed E2F/DP-dependent control of mitochondria-associated genes.
  • Performed genetic attenuation of E2F/DP targets.

Main Results:

  • Drosophila dDP mutants exhibit resistance to irradiation-induced apoptosis.
  • The apoptotic transcriptional program is induced in dDP mutants, contrary to previous assumptions.
  • Mitochondrial dysfunction underlies the apoptotic resistance in dDP mutants.
  • E2F/DP directly controls the expression of mitochondria-associated genes.
  • Genetic attenuation of E2F/DP targets mimics the mitochondrial phenotype and confers resistance to apoptosis.
  • The regulatory role of E2F/DP in mitochondrial function is conserved between Drosophila and humans.

Conclusions:

  • E2F/DP transcription factors play a critical role in regulating mitochondrial function.
  • Mitochondrial dysfunction, mediated by E2F/DP, is responsible for the resistance to irradiation-induced apoptosis in dDP mutants.
  • This finding highlights a novel mechanism linking E2F/DP, mitochondrial health, and apoptosis, with conserved implications for human biology.

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