Temperature-dependent augmentation of ciliary motility by the TRP2 channel in Chlamydomonas reinhardtii
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Updated: Jul 1, 2025

Observation of Photobehavior in Chlamydomonas reinhardtii
Published on: May 6, 2022
Shunta Fueki1, Taro Kaneko1, Haruka Matsuki1
1Department of Machinery and Control Systems, College of Systems Engineering and Science, Shibaura Institute of Technology, Saitama, Japan.
Abstract:
Temperature is a critical factor for living organisms. Many microorganisms migrate toward preferable temperatures, and this behavior is called thermotaxis. In this study, the molecular and physiological bases for thermotaxis are examined in Chlamydomonas reinhardtii. A mutant with knockout of a transient receptor potential (TRP) channel, trp2-3, showed defective thermotaxis. The swimming velocity and ciliary beat frequency of wild-type Chlamydomonas increase with temperature; however, this temperature-dependent enhancement of motility was almost absent in the trp2-3 mutant. Wild-type Chlamydomonas showed negative thermotaxis, but mutants deficient in the outer or inner dynein arm showed positive thermotaxis and a defect in temperature-dependent increase in swimming velocity, suggesting involvement of both dynein arms in thermotaxis.
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