ID | 64007 |
フルテキストURL | |
著者 |
Moriyama, Yoshiyuki
Department of Natural Sciences, Kawasaki Medical School, Kurashiki 701-0192, Japan
Takeuchi, Kazuki
Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
Tomioka, Kenji
Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
ORCID
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抄録 | Most insects show circadian rhythms of which the free-running period changes in a light-dependent manner and is generally longer under constant light (LL) than under constant dark conditions in nocturnal animals. However, the mechanism underlying this LL-dependent period change remains unclear. Here, using the cricket Gryllus bimaculatus, we examined the effects of long-term LL exposure on the free-running period of locomotor rhythms. Initially, the free-running period was considerably longer than 24 h but it gradually became shorter during long-term exposure to LL. The initiallengthening and ensuing gradual shortening under long-term LL exposure were observed evenafter unilateral removal of the optic lobe. Thus, these changes in the free-running period could be attributable to a single optic lobe clock. RNA interference (RNAi)-mediated silencing of the clock genes Par domain protein 1 (Pdp1) and timeless (tim) revealed that the treatments eliminated the initial period lengthening by LL without reducing circadian photoreceptor gene expression. However, they did not affect the period shortening during long-term LL exposure. The slopes of the regression line for the period change during long-term LL for Pdp1RNAi-treated and timRNAi-treated crickets were not different from that of the dsDsRed2-treated control. These results suggest that the initial period lengthening after transfer to LL requires tim and Pdp1, while the ensuing period shortening during long-term LL exposure is caused by a mechanism independent of tim and Pdp1.
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キーワード | circadian rhythm
cricket
free-running period
constant light
clock gene
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備考 | This full-text file will be available in July 2023.
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発行日 | 2022-07-04
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出版物タイトル |
Zoological Science
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巻 | 39巻
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号 | 5号
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出版者 | Zoological Society of Japan
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開始ページ | 459
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終了ページ | 467
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ISSN | 0289-0003
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NCID | AA10545874
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資料タイプ |
学術雑誌論文
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言語 |
英語
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OAI-PMH Set |
岡山大学
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著作権者 | © 2022 Zoological Society of Japan
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論文のバージョン | publisher
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PubMed ID | |
DOI | |
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関連URL | isVersionOf https://doi.org/10.2108/zs220014
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助成機関名 |
Japan Society for the Promotion of Science
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助成番号 | 18H02480
21K06267
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