Variation in gene duplicates with low synonymous divergence in Saccharomyces cerevisiae relative to Caenorhabditis elegans.

Abstract:

BACKGROUND:The direct examination of large, unbiased samples of young gene duplicates in their early stages of evolution is crucial to understanding the origin, divergence and preservation of new genes. Furthermore, comparative analysis of multiple genomes is necessary to determine whether patterns of gene duplication can be generalized across diverse lineages or are species-specific. Here we present results from an analysis comprising 68 duplication events in the Saccharomyces cerevisiae genome. We partition the yeast duplicates into ohnologs (generated by a whole-genome duplication) and non-ohnologs (from small-scale duplication events) to determine whether their disparate origins commit them to divergent evolutionary trajectories and genomic attributes. RESULTS:We conclude that, for the most part, ohnologs tend to appear remarkably similar to non-ohnologs in their structural attributes (specifically the relative composition frequencies of complete, partial and chimeric duplicates), the discernible length of the duplicated region (duplication span) as well as genomic location. Furthermore, we find notable differences in the features of S. cerevisiae gene duplicates relative to those of another eukaryote, Caenorhabditis elegans, with respect to chromosomal location, extent of duplication and the relative frequencies of complete, partial and chimeric duplications. CONCLUSIONS:We conclude that the variation between yeast and worm duplicates can be attributed to differing mechanisms of duplication in conjunction with the varying efficacy of natural selection in these two genomes as dictated by their disparate effective population sizes.

journal_name

Genome Biol

journal_title

Genome biology

authors

Katju V,Farslow JC,Bergthorsson U

doi

10.1186/gb-2009-10-7-r75

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

R75

issue

7

eissn

1474-7596

issn

1474-760X

pii

gb-2009-10-7-r75

journal_volume

10

pub_type

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