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genomic convergence toward diploidy in saccharomyces cerevisiae在酿酒酵母基因组融合向二倍性
Genomic Convergence toward Diploidy
in Saccharomyces cerevisiae
*
Aleeza C. Gerstein, Hye-Jung E. Chun, Alex Grant, Sarah P. Otto
Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada
Genome size, a fundamental aspect of any organism, is subject to a variety of mutational and selection pressures. We
investigated genome size evolution in haploid, diploid, and tetraploid initially isogenic lines of the yeast
Saccharomyces cerevisiae. Over the course of ;1,800 generations of mitotic division, we observed convergence
toward diploid DNA content in all replicate lines. This convergence was observed in both unstressful and stressful
environments, although the rate of convergence was dependent on initial ploidy and evolutionary environment.
Comparative genomic hybridization with microarrays revealed nearly euploid DNA content by the end of the
experiment. As the vegetative life cycle of S. cerevisiae is predominantly diploid, this experiment provides evidence
that genome size evolution is constrained, with selection favouring the genomic content typical of the yeast’s
evolutionary past.
Citation: Gerstein AC, Chun HJE, Grant A, Otto SP (2006) Genomic convergence toward diploidy in Saccharomyces cerevisiae. PLoS Genet 2(9): e145. DOI: 10.1371/journal.
pgen.0020145
Introduction Results/Discussion
Organisms vary tremendously in genome size [1,2] yet the Evolution with respect to genome size was surprisingly
key evolutionary forces acting to shape genome size in any consistent: all strains converged toward or remained diploid
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