1. Clock Gene Expression in Eel Retina and Hypothalamus: Response to Photoperiod and Moonlight.
- Author
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Hyeon, Ji‐Yeon, Byun, Jun‐Hwan, Kim, Byung‐Hoon, Hettiarachchi, Sachithra Amarin, Han, Jeonghoon, Choi, Young‐Ung, Noh, Choong‐Hwan, Takeuchi, Yuki, Choi, Soo‐Youn, Park, Jong‐Eun, and Hur, Sung‐Pyo
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CLOCK genes , *MOLECULAR clock , *GENE expression , *NEW moon , *FULL moon - Abstract
ABSTRACT Assessment of the clock genes, Period (
Per ) 1,Per2 ,Per3 , and Cryptochrome (Cry ) 2,Cry3 , andCry4 , can help better understand eel spawning ecology. In this study, the circadian rhythm and moonlight effects of these clock genes in the eel retina and hypothalamus were analyzed. We examined clock gene expression patterns under 12 h light:12 h darkness (12L12D), constant darkness (DD), and constant light (LL) conditions; under short photoperiod (SP; 9L15D) and long photoperiod (LP; 15L9D), and during the new moon (NM) and full moon in male eels.Per2 expression increased after sunrise,Cry2 , andCry4 expression increased around sunset, andPer1 ,Per3 , andCry3 expression increased before sunrise. Under SP conditions, oscillations of retinalPer3 andCry4 , which did not occur under LP conditions, were generated. In addition, retinalCry4 oscillation was generated under NM conditions. These results suggest that the retina of the eel may play an important role in regulating circadian rhythm, and migration is initiated by the synchronization of clock genes by moonlight, suggesting that photic signals are closely related to the migratory activity of the eel. [ABSTRACT FROM AUTHOR]- Published
- 2024
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