| Project/Area Number |
16H05767
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Ecology/Environment
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Research Collaborator |
Makino Takashi
Maruyama Shinichiro
Terai Yohei
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2018: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2017: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2016: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
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| Keywords | 温度適応 / アノールトカゲ / キューバ / 温度的適応 / 進化 / 適応放散 / 温度適応進化 / 平行進化 |
|---|
| Outline of Final Research Achievements |
Anolis species has evolved from being a shade-adapted, forest species to an open-habitat species independently at least four times in Cuba. In this study, we estimate positively selected genes during the evolution of a shade-adapted, forest species to an open-habitat species (A. sagrei and A. allisoni) by using PALM and McDonald-Kreitman test. We detected three genes tex28とtgfb1、leng8 were positively selected both lineage of A. sagrei and A. allisoni. In addition, we determined the whole genome sequences of A. sagrei and A. allogus (a shade-adapted, forest species) and compared gene duplication rates between species. The results showed that gene duplication rates in A. sagrei was higher than that in A. allogus. In addition, several genes related to thermal adaptation, the number of the copies were higher in A. sagrei than those in A. allogus. These suggest that increasing number of gene copies are related to adaptation to open and hot habitat in Anolis lizard.
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| Academic Significance and Societal Importance of the Research Achievements |
近年、温暖化による温度上昇に生物がどのように進化的反応をするのかという問題は、多くの注目が集まっており、進化学および生態系保全において重要な問題である。アノールトカゲの異なる温度環境への適応分化を促進する進化機構の解明は、「適応放散による多様化」と「温度に対する進化的反応」という両者の問題を解明する上で貴重で重要な課題である。本研究の成果は、その進化機構の解明につながる重要な結果を提供した。
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