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ISME J. 2014 Jul;8(7):1358-69. doi: 10.1038/ismej.2013.247. Epub 2014 Jan 23.

The quest for a unified view of bacterial land colonization.

Author information

1
CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China.
2
Key Lab of Rubber Biology, Ministry of Agriculture and Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, China.

Abstract

Exploring molecular mechanisms underlying bacterial water-to-land transition represents a critical start toward a better understanding of the functioning and stability of the terrestrial ecosystems. Here, we perform comprehensive analyses based on a large variety of bacteria by integrating taxonomic, phylogenetic and metagenomic data, in the quest for a unified view that elucidates genomic, evolutionary and ecological dynamics of the marine progenitors in adapting to nonaquatic environments. We hypothesize that bacterial land colonization is dominated by a single-gene sweep, that is, the emergence of dnaE2 derived from an early duplication event of the primordial dnaE, followed by a series of niche-specific genomic adaptations, including GC content increase, intensive horizontal gene transfer and constant genome expansion. In addition, early bacterial radiation may be stimulated by an explosion of land-borne hosts (for example, plants and animals) after initial land colonization events.

PMID:
24451209
PMCID:
PMC4069389
DOI:
10.1038/ismej.2013.247
[Indexed for MEDLINE]
Free PMC Article

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