期刊
MICROORGANISMS
卷 9, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/microorganisms9020407
关键词
pangenome; core genome; rhizobiales; nitrogen-fixing symbiosis; nodulation genes; functional divergence; Rhizobium sullae
类别
资金
- University of Padova [CPDA154841/15]
Pangenome analysis reveals evolutionary instances and critical genome core conservation in Rhizobiales, with a core genome of 700 genes enriched in macromolecule metabolism and translation machinery, while membrane/periplasm-associated genes and transport domains are under-represented.
Pangenome analyses reveal major clues on evolutionary instances and critical genome core conservation. The order Rhizobiales encompasses several families with rather disparate ecological attitudes. Among them, Rhizobiaceae, Bradyrhizobiaceae, Phyllobacteriacreae and Xanthobacteriaceae, include members proficient in mutualistic symbioses with plants based on the bacterial conversion of N-2 into ammonia (nitrogen-fixation). The pangenome of 12 nitrogen-fixing plant symbionts of the Rhizobiales was analyzed yielding total 37,364 loci, with a core genome constituting 700 genes. The percentage of core genes averaged 10.2% over single genomes, and between 5% to 7% were found to be plasmid-associated. The comparison between a representative reference genome and the core genome subset, showed the core genome highly enriched in genes for macromolecule metabolism, ribosomal constituents and overall translation machinery, while membrane/periplasm-associated genes, and transport domains resulted under-represented. The analysis of protein functions revealed that between 1.7% and 4.9% of core proteins could putatively have different functions.
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