
ナマコのクロック遺伝子NvClkは、光依存的な経路を介して概日リズムを維持する重要な役割を果たしている。


coremsg

The circadian clock enables anticipation of the day/night cycle in animals ranging from cnidarians to mammals. Circadian rhythms are generated through a transcription-translation feedback loop (TTFL or pacemaker) with CLOCK as a conserved positive factor in animals. However, CLOCK’s functional evolutionary origin and mechanism of action in basal animals are unknown. In the cnidarian Nematostella vectensis , pacemaker gene transcript levels, including NvClk (the Clock ortholog), appear arrhythmic under constant darkness, questioning the role of NvCLK. Utilizing CRISPR/Cas9, we generated a NvClk allele mutant ( NvClkΔ ), revealing circadian behavior loss in constant light conditions (LL and DD) while a 24-hour rhythm was maintained under light-dark condition (LD). Transcriptomics showed distinct rhythmic genes in wild-type (WT) genes in LD compared to DD. The LD NvClkΔ/Δ showed comparable numbers of rhythmic genes, but were greatly reduced in DD. Furthermore, the LD NvClkΔ/Δ showed alterations in temporal pacemaker gene expression, affecting their potential interactions. Additionally, differential expression of non-rhythmic genes associated with cell division and neuronal differentiation was observed. These findings revealed that a light-responsive pathway can partially compensate for circadian clock disruption and that the Clock gene has evolved in cnidarians to synchronize rhythmic physiology and behavior to the diel rhythm of the earth’s biosphere.

### Competing Interest Statement

The authors have declared no competing interest.

CLOCK evolved in cnidaria to synchronize internal rhythms with diel environmental cues

地球生物圏の日周リズムに同調するためのクロック遺伝子の機能解明-海洋無脊椎動物ナマコの事例


地球生物圏の日周リズムに同調するためのクロック遺伝子の機能解明 - 海洋無脊椎動物ナマコの事例
