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Ty1 transposition induced by carcinogens in Saccharomyces cerevisiae yeast depends on mitochondrial function

Teodora Stoycheva1, Domenica Rita Massardo, Margarita Pesheva

  • 1Institute of Cryobiology and Food Technology, Department of Molecular Ecology, 53 A Cherni Vrah Blvd, 1407 Sofia, Bulgaria.

Gene
|January 9, 2007
PubMed

Insights

Carcinogens trigger Ty1 transposition in yeast, but this process requires functional mitochondria. Yeast with damaged mitochondria (rho(-) mutants) show inhibited Ty1 transposition when exposed to carcinogens.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The transposition of the Ty mobile genetic element in Saccharomyces cerevisiae is induced by carcinogens.
  • The precise mechanism of carcinogen-induced Ty1 transposition remains unclear, despite understanding spontaneous transposition.

Purpose of the Study:

  • To investigate the role of mitochondrial function in carcinogen-induced Ty1 transposition in Saccharomyces cerevisiae.
  • To elucidate the molecular mechanisms underlying carcinogen-mediated mobile element activity.

Main Methods:

  • Comparison of Ty1 transposition rates in wild-type (rho(+)) and mitochondrial-deficient (rho(-)) yeast strains.
  • Treatment of yeast strains with various carcinogens and ethidium bromide.
  • Analysis of the impact of oxidative phosphorylation on Ty1 transposition.

Main Results:

  • Mitochondrial functions are essential for carcinogen-induced Ty1 transposition.
  • Mitochondrial-deficient (rho(-)) mutants exhibit significantly reduced Ty1 transposition rates upon carcinogen exposure.
  • The inhibition of Ty1 transposition in rho(-) cells is independent of the specific carcinogen used.

Conclusions:

  • Carcinogen-induced Ty1 transposition in Saccharomyces cerevisiae is dependent on functional mitochondria.
  • Compromised mitochondrial function, specifically the absence of oxidative phosphorylation, inhibits Ty1 transposition.
  • Mitochondria play a critical regulatory role in the response of mobile genetic elements to carcinogenic agents.

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