2013 Fiscal Year Final Research Report
Functional Evolutionary genomics: Inferring the origin and function of the genes involved in nodulation symbiosis with nitrogen fixation
| Project/Area Number |
20570220
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Evolutionary biology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
AOKI Seishiro 東京大学, 総合文化研究科, 学術研究員 (10334301)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Motomi 東京大学, 大学院総合文化研究科, 教授 (00193524)
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| Project Period (FY) |
2008-04-08 – 2013-03-31
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| Keywords | 進化 / ゲノム / 共生 / 根粒菌 / マメ科植物 |
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| Research Abstract |
There is a possibility that the symbiosis genes with an important role for the nodulation and nitrogen fixation passed through the special evolution that may be different from the other housekeeping genes. We compared the genomic information of various bacteria using the background information of symbiosis with legumes and inferred the new symbiotic nodulation genes and the evolution of this symbiosis. We examined large scale phylogenetic profiling and revealed the evolutionary origin of nodulation genes. Contrary to the widely accepted scenario of the alpha-proteobacterial origin of rhizobia, our exhaustive analysis showed that the nodulation symbiosis of rhizobia with legumes may have originated from beta-proteobacterial family. Furthermore, we found that there was a possibility that several genes which symbiosis function was not known so far are characteristic of root nodule bacteria. We confirm the symbiosis function of these genes by the gene destruction.
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