Gene Duplications Are At Least 50 Times Less Frequent than Gene Transfers in Prokaryotic Genomes

被引:17
作者
Tria, Fernando D. K. [1 ]
Martin, William F. [1 ]
机构
[1] Heinrich Heine Univ Dusseldorf, Inst Mol Evolut, Dept Biol, Dusseldorf, Germany
来源
GENOME BIOLOGY AND EVOLUTION | 2021年 / 13卷 / 10期
基金
欧洲研究理事会;
关键词
gene duplication; lateral gene transfer; frequency of events; prokaryote evolution; EVOLUTION; PHYLOGENY; ARCHAEAL; DATABASE; REFSEQ;
D O I
10.1093/gbe/evab224
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The contribution of gene duplications to the evolution of eukaryotic genomes is well studied. By contrast, studies of gene duplications in prokaryotes are scarce and generally limited to a handful of genes or careful analysis of a few prokaryotic lineages. Systematic broad-scale studies of prokaryotic genomes that sample available data are lacking, leaving gaps in our understanding of the contribution of gene duplications as a source of genetic novelty in the prokaryotic world. Here, we report conservative and robust estimates for the frequency of recent gene duplications within prokaryotic genomes relative to recent lateral gene transfer (LGT), as mechanisms to generate multiple copies of related sequences in the same genome. We obtain our estimates by focusing on evolutionarily recent events among 5,655 prokaryotic genomes, thereby avoiding vagaries of deep phylogenetic inference and confounding effects of ancient events and differential loss. We find that recent, genome-specific gene duplications are at least 50 times less frequent and probably 100 times less frequent than recent, genome-specific, gene acquisitions via LGT. The frequency of gene duplications varies across lineages and functional categories. The findings improve our understanding of genome evolution in prokaryotes and have far-reaching implications for evolutionary models that entail LGT to gene duplications ratio as a parameter.
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页数:14
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