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After the Duplication: Gene Loss and Adaptation in Saccharomyces Genomes

After the Duplication: Gene Loss and Adaptation in Saccharomyces Genomes The ancient duplication of the Saccharomyces cerevisiae genome and subsequent massive loss of duplicated genes is apparent when it is compared to the genomes of related species that diverged before the duplication event. To learn more about the evolutionary effects of the duplication event, we compared the S. cerevisiae genome to other Saccharomyces genomes. We demonstrate that the whole genome duplication occurred before S. castellii diverged from S. cerevisiae. In addition to more accurately dating the duplication event, this finding allowed us to study the effects of the duplication on two separate lineages. Analyses of the duplication regions of the genomes indicate that most of the duplicated genes (∼85%) were lost before the speciation. Only a small amount of paralogous gene loss (4–6%) occurred after speciation. On the other hand, S. castellii appears to have lost several hundred genes that were not retained as duplicated paralogs. These losses could be related to genomic rearrangements that reduced the number of chromosomes from 16 to 9. In addition to S. castellii, other Saccharomyces sensu lato species likely diverged from S. cerevisiae after the duplication. A thorough analysis of these species will likely reveal other important outcomes of the whole genome duplication. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Genetics Oxford University Press

After the Duplication: Gene Loss and Adaptation in Saccharomyces Genomes

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References (27)

Publisher
Oxford University Press
Copyright
© Genetics 2006
ISSN
0016-6731
eISSN
1943-2631
DOI
10.1534/genetics.105.048900
Publisher site
See Article on Publisher Site

Abstract

The ancient duplication of the Saccharomyces cerevisiae genome and subsequent massive loss of duplicated genes is apparent when it is compared to the genomes of related species that diverged before the duplication event. To learn more about the evolutionary effects of the duplication event, we compared the S. cerevisiae genome to other Saccharomyces genomes. We demonstrate that the whole genome duplication occurred before S. castellii diverged from S. cerevisiae. In addition to more accurately dating the duplication event, this finding allowed us to study the effects of the duplication on two separate lineages. Analyses of the duplication regions of the genomes indicate that most of the duplicated genes (∼85%) were lost before the speciation. Only a small amount of paralogous gene loss (4–6%) occurred after speciation. On the other hand, S. castellii appears to have lost several hundred genes that were not retained as duplicated paralogs. These losses could be related to genomic rearrangements that reduced the number of chromosomes from 16 to 9. In addition to S. castellii, other Saccharomyces sensu lato species likely diverged from S. cerevisiae after the duplication. A thorough analysis of these species will likely reveal other important outcomes of the whole genome duplication.

Journal

GeneticsOxford University Press

Published: Feb 1, 2006

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