期刊
BIOLOGY LETTERS
卷 5, 期 3, 页码 429-432出版社
ROYAL SOC
DOI: 10.1098/rsbl.2008.0793
关键词
adaptation; expansion; reduction; bacterial genomes; genomic islands
资金
- Marie Curie Intra-European fellowship
- European Union
- Swedish Research Council
- Swedish Foundation for Strategic Research
- Goran Gustafsson Foundation
- Knut and Alice Wallenberg Foundation
The alpha-proteobacteria represent one of the most diverse bacterial subdivisions, displaying extreme variations in lifestyle, geographical distribution and genome size. Species for which genome data are available have been classified into a species tree based on a conserved set of vertically inherited core genes. By mapping the variation in gene content onto the species tree, genomic changes can be associated with adaptations to specific growth niches. Genes for adaptive traits are mostly located in 'plasticity zones' in the bacterial genome, which also contain mobile elements and are highly variable across strains. By physically separating genes for information processing from genes involved in interactions with the surrounding environment, the rate of evolutionary change can be substantially enhanced for genes underlying adaptation to new growth habitats, possibly explaining the ecological success of the alpha-proteobacterial subdivision.
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