Profile

Takumi Yokomizo

Affiliation

Graduate School of Science, Chiba University

Society

The Ecological Society of Japan / Japanese Society for Chronobiology / Society of Evolutionary Studies, Japan / European Biological Rhythms Society

E-mail

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 -

JSPS Research Fellowship for Young Scientists (DC1)

JSPS Research Fellowship for Young Scientists (PD)

Awards

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

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.
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.

Presentations

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]

and 8 presentations in Japanese conferences