Evidence for widespread GC-biased gene conversion in eukaryotes.
Evidence for widespread GC-biased gene conversion in eukaryotes.
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DOI:
10.1093/gbe/evs052
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发表时间:
2012
影响因子:
3.3
通讯作者:
Marais GA
中科院分区:
文献类型:
--
作者:
Pessia E;Popa A;Mousset S;Rezvoy C;Duret L;Marais GA
GC-biased gene conversion (gBGC) is a process that tends to increase the GC content of recombining DNA over evolutionary time and is thought to explain the evolution of GC content in mammals and yeasts. Evidence for gBGC outside these two groups is growing but is still limited. Here, we analyzed 36 completely sequenced genomes representing four of the five major groups in eukaryotes (Unikonts, Excavates, Chromalveolates and Plantae). gBGC was investigated by directly comparing GC content and recombination rates in species where recombination data are available, that is, half of them. To study all species of our dataset, we used chromosome size as a proxy for recombination rate and compared it with GC content. Among the 17 species showing a significant relationship between GC content and chromosome size, 15 are consistent with the predictions of the gBGC model. Importantly, the species showing a pattern consistent with gBGC are found in all the four major groups of eukaryotes studied, which suggests that gBGC may be widespread in eukaryotes.
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