横溝 匠
Takumi Yokomizo
Profile
Takumi Yokomizo
Affiliation
Center for Ecological research, Kyoto University
Society
The Ecological Society of Japan / Japanese Society for Chronobiology / Society of Evolutionary Studies, Japan / European Biological Rhythms Society / Society for Molecular Biology and Evolution
turdus.tsugumi#at#gmail.com (Please convert #at# to @)
Education
2015.04 - 2019.03
2019.04 - 2020.09
2020.10 - 2023.03
2019.04 - 2023.03
BSc, Department of Biology, Faculty of Science, Chiba University
MSc, Department of Biology, Division of Advanced Science and Engineering, Graduate School of Science and Engineering, Chiba University
Ph.D. student, Department of Biology, Division of Advanced Science and Engineering, Graduate School of Science and Engineering, Chiba University
Frontier Science Program, Graduate School of Science and Engineering, Chiba University
Work experience
2021.04 - 2023.03
2023.04 - 2024.03
2024.04 -
JSPS Research Fellowship for Young Scientists (DC1), Chiba University
JSPS Research Fellowship for Young Scientists (PD), Chiba University
CER PostDoc Fellow, Center for Ecological Research, Kyoto University
Awards
2019.03
2019.03
2020.09
2021.03
2022.07
2023.03
Dean's commendation at Chiba University
ESJ69 Best Poster Award
JSC27 Poster Excellence Award
Dean's commendation at Chiba University
EBRS Congress 2022 Poster Excellence Award
Dean's commendation at Chiba University
Researches
Shift in endogenous rhythms and adaptation to tidal environments in the freshwater snail
Organisms have acquired endogenous time-keeping systems (biological clocks). Synchronization of biological processes with environmental cycles results in the high performance of individuals. Therefore, modification of the biological clocks could coincide with the range expansion to a novel rhythmic environment.
I focused on the lower reaches of rivers where organisms are exposed to both diurnal and tidal cycles. Here, it would be adaptive to have a circadian and circatidal rhythm (tidally synchronized rhythm). The goal of my study is to demonstrate adaptation to the tidal environment via acquiring a circatidal rhythm in the freshwater snail, Semisulcospira reiniana.
Exploring circatidal clock genes and molecular genetic mechanisms of tidal adaptation.
The recent development of molecular biological techniques has greatly advanced researches on the circadian rhythm. The importance of circadian rhythm is discussed in diverse fields such as medical, nutrition, and sports science. On the other hand, little is revealed about the molecular basis of circatidal rhythm. The circatidal rhythm is found in various species adapted to tidal environments. Discovering the circatidal clock genes will not only lead to reveal molecular and physiological basis but also provide insights into molecular genetic mechanisms of the tidal adaptation. I believe that the exploring circatidal clock genes is a major challenge in discussing the evolution of biological clocks.
Publications
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Yokomizo, T. and Y. Takahashi (2020) Changes in transcriptomic response to salinity stress induce the brackish water adaptation in a freshwater snail. Scientific Reports, 10, 16049. https://doi.org/10.1038/s41598-020-73000-8
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Yokomizo, T. and Y. Takahashi (2022) Endogenous rhythm variation and adaptation to the tidal environment in the freshwater snail, Semisulcospira reiniana. Frontiers in Ecology and Evolution, 10:1078234.
https://doi.org/10.3389/fevo.2022.1078234 -
Yokomizo, T. and Y. Takahashi (2024) Plasticity of circadian and circatidal rhythms in activity and transcriptomic dynamics in a freshwater snail. Heredity, in press. https://doi.org/10.1038/s41437-024-00680-7
Presentations
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Yokomizo, T. and Y. Takahashi. The plastic shift in the endogenous rhythm in tidal adaptation of the freshwater snail. 17th European Biological Rhythms Society Congress, Zurich, Switzerland. (July 2022) [Poster]
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Yokomizo, T., and Y. Takahashi. Environment-dependent endogenous rhythms and transcriptomic differentiation in a freshwater snail. The Annual Meeting of the Society for Molecular Biology and Evolution 2023, Ferrara, Italy. (July 2023) [Poster]
and 12 presentations in Japanese conferences