Cnidarians are CLOCKing in.

Area of Science:

• * Evolutionary biology
• * Chronobiology
• * Animal physiology

Background:

• * The circadian clock, a fundamental biological rhythm, is crucial for regulating physiological processes in animals.
• * Understanding the evolutionary origins of the circadian clock is essential for comprehending its diverse roles across species.

Purpose of the Study:

• * To investigate the early evolution of the circadian clock using the starlet sea anemone as a model organism.
• * To provide insights into the ancestral mechanisms underlying circadian rhythmicity in animals.

Main Methods:

• * Comparative genomic analysis of clock genes in the starlet sea anemone.
• * Behavioral assays to assess circadian rhythmicity in the anemone.
• * Molecular analyses of clock gene expression patterns.

Main Results:

• * Identification of conserved core clock components in the starlet sea anemone.
• * Evidence of functional circadian rhythmicity in this early-diverging animal.
• * Insights into the ancestral state of circadian clock systems.

Conclusions:

• * The starlet sea anemone possesses a functional circadian clock, suggesting early evolutionary origins.
• * This study provides a valuable model for understanding the fundamental evolution of circadian clocks in the animal kingdom.