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Related Concept Videos

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Related Experiment Video

Updated: Feb 13, 2026

A High-Throughput In Situ Method for Estimation of Hepatocyte Nuclear Ploidy in Mice
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Spontaneous Changes in Ploidy Are Common in Yeast.

Yaniv Harari1, Yoav Ram2, Nimrod Rappoport1

  • 1School of Molecular Cell Biology & Biotechnology, Tel Aviv University, Ramat Aviv, Israel.

Current Biology : CB
|March 6, 2018
PubMed
Summary

Spontaneous diploidization in yeast is common and can be selected against or favored by stress. Researchers identified two distinct mechanisms driving this ploidy change, impacting evolution and disease.

Keywords:
Saccharomyces cerevisiaeendoreduplicationevolutionfluctuation testmating-type switchploidyyeast

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Cancer Research

Background:

  • Ploidy changes, particularly genome duplications, are infrequent but crucial in cancer development and long-term adaptation.
  • Whole-genome duplications can influence adaptive evolution rates and promote genomic instability.
  • Quantifying the rate of whole-genome duplications has been a significant challenge in evolutionary studies.

Purpose of the Study:

  • To systematically investigate the occurrence and mechanisms of diploid cell appearance in evolving haploid yeast cultures.
  • To determine the selective pressures influencing spontaneous diploidization events.
  • To differentiate between various pathways leading to diploidization.

Main Methods:

  • Culturing haploid yeast strains for over 100 generations across diverse media.
  • Systematic monitoring and quantification of diploid cell formation.
  • Distinguishing between endoreduplication and mating-type switching as diploidization mechanisms.

Main Results:

  • Spontaneous diploidization is a frequent event in evolving yeast populations.
  • Diploidization is generally selected against but can be advantageous under specific stressful conditions.
  • Two distinct mechanisms for diploidization were identified: endoreduplication and mating-type switching.

Conclusions:

  • The findings provide insights into the evolutionary dynamics of ploidy changes in eukaryotes.
  • Understanding diploidization mechanisms is vital for studying fungal pathogen evolution and cancer development.
  • This research has implications for yeast's role in biotechnology and understanding genomic instability.