2019 Fiscal Year Research-status Report
Parallel evolution of complex adaptations through introgression: the study case of pelvic fin brooding in Sulawesi medaka.
| Project/Area Number |
19K16203
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
Montenegro Javier 琉球大学, 熱帯生物圏研究センター, ポスドク研究員 (70835347)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | genome / Oryzias / Adrianichthys / Sulawesi / Pelvic-fin brooding / Introgression / Ancestral polymorphism / Convergent evolution |
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| Outline of Annual Research Achievements |
We have preliminary completed all whole genome comparative analyses among Sulawesi medaka species as follows: 1. Reconstructed the species trees for all medaka species/populations in Sulawesi Islands. 2. Computed absolute genetic distance analyses between the genomes of all medaka species pairs in Sulawesi. 3. Identified segregated sites between brooder and non-brooder species. 4. Completed synteny analyses between Sulawesi medaka species and outgroup species for each of the segregated sites found above. 5. Performed phylogenetic analyses and topological searches across all syntenic regions with segregated sites between brooders and non-brooder species. 6. Characterized the reproductive mode of all medaka species endemic to Sulawesi, and two outgroups. 7. Cross the information from my previous QTL analyses experiments on pelvic fin brooding with the results from whole-genome comparisons and segregated sites analyses. 8. Introgression analyses has been completed using genome wide SNPs and standard admixture statistical test.
The repeated evolution of pelvic fin brooding could be potentially explained by one of the following hypotheses: 1. Introgression, 2. Ancestral polymorphism, 3. Convergent evolution. Preliminary results reject the possibility for introgression from genus Adrianichthys to pelvic-fin brooder species in Oryzias, and the idea of ancestral polymorphism has been rejected as well. The major body of evidence support the view of a pure case of independent convergent evolution of pelvic-fin brooding in both clades.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
We have established a good research network including research from inside and outside the university of the Ryukyous. This has enabled us to perform data analysis faster and more efficient than the original planed
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| Strategy for Future Research Activity |
I will continue working on ongoing analyses, and on the characterization of pelvic-fin brooding at the molecular and phenotypical level.
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Research Products
(1 results)
