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Mutator suppression and escape from replication error-induced extinction in yeast.

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High mutation rates are tolerated by cells up to a critical error threshold. Genetic adaptation rapidly suppresses these mutator phenotypes, preventing extinction and offering insights into cancer.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • Cellular DNA replication fidelity is maintained by conserved pathways, including polymerase proofreading and mismatch repair.
  • Loss of these repair mechanisms increases mutation rates, which can aid cellular adaptation but may lead to inviability if mutation rates become too high.

Purpose of the Study:

  • To determine the maximal tolerable mutation rate in haploid yeast.
  • To identify genetic suppressors of mutator phenotypes and understand mechanisms of adaptation to high mutation rates.

Main Methods:

  • Combining alleles affecting DNA polymerase delta (Pol δ) proofreading and mismatch repair in yeast.
  • Quantifying mutation rates and identifying genetic variants that escape error-induced extinction.

Main Results:

  • Yeast populations can tolerate mutation rates up to 1,000-fold higher than wild-type levels.
  • Cellular collapse occurs when mutation rates exceed 10⁻³ inactivating mutations per gene per cell division.
  • Genetic adaptation, through Pol δ mutations or extragenic changes, rapidly suppresses mutator phenotypes.

Conclusions:

  • Mutator phenotypes in eukaryotes are transient and subject to rapid genetic suppression.
  • Adaptation mechanisms involve both direct suppression of polymerase errors and broader genetic changes.
  • Understanding mutator suppression is crucial for comprehending their role in cancer development.