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Studying Age-dependent Genomic Instability using the S. cerevisiae Chronological Lifespan Model
Published on: September 29, 2011
Yeasty clocks: dating genomic changes in yeasts.
Thomas Rolland1, Bernard Dujon
1Unité de Génétique Moléculaire des Levures, CNRS URA2171 and University P-M-Curie UFR927, Institut Pasteur, 25 rue du Docteur-Roux, 75724 Paris cedex 15, France.
Comptes Rendus Biologies
|August 9, 2011
Summary
This study calibrates yeast evolutionary clocks using mutation rates and synteny conservation. It reveals a non-linear relationship between sequence divergence and chromosomal rearrangements, applicable to both yeasts and insects.
Area of Science:
- Evolutionary biology
- Genomics
- Molecular biology
Background:
- Accurate dating of evolutionary changes is crucial for comparative genomics.
- Yeast genome evolution dating lacks fossil records, necessitating intrinsic genomic methods.
- Extrapolating evolutionary clocks from other organisms introduces uncertainty.
Purpose of the Study:
- To establish reliable evolutionary clocks for yeast (Saccharomycotina) using intrinsic genomic properties.
- To compare divergence-based and rearrangement-based evolutionary clocks within yeasts.
- To investigate the relationship between sequence divergence and chromosomal rearrangements in yeasts and compare it with insects.
Main Methods:
- Utilizing the experimentally determined mutational rate of Saccharomyces cerevisiae.
- Calculating successive generations based on observed sequence polymorphism between yeast strains/species.
- Examining synteny conservation across the Saccharomycotina subphylum to establish a chromosomal rearrangement clock.
- Comparing the sequence divergence clock with the chromosomal rearrangement clock.
Main Results:
- A non-linear relationship was observed between sequence divergence and chromosomal rearrangements in yeasts.
- This non-linear relationship also applies to insects.
- For equivalent sequence divergence, insects exhibit a higher rate of chromosomal rearrangements than yeasts.
Conclusions:
- Intrinsic genomic properties, specifically mutation rates and synteny conservation, can be used to calibrate yeast evolutionary clocks.
- The comparison of two distinct evolutionary clocks reveals a conserved non-linear evolutionary dynamic across different eukaryotic lineages.
- Understanding these dynamics is key for accurate phylogenetic reconstructions and evolutionary studies in yeasts and beyond.
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