Book Review: Molecular Regulation of Circadian Rhythms in Drosophila and Mammals

The core circadian clock mechanism involves a transcriptional/translational feedback loop primarily composed of clock genes that are similar across species.

• Clock genes are conserved between fruit flies and mammals.
• These genes are located in brain areas linked to rhythm regulation and in peripheral tissues, suggesting they may influence local functions.
• Light is the main environmental factor that helps synchronize the circadian clock.
• In fruit flies, light triggers the breakdown of a clock component, aiding in clock synchronization.
• The blue light photoreceptor cryptochrome is involved in transmitting light signals to the clock mechanism.
• Mammalian clock gene expression changes in response to light, but the specific photoreceptors remain unidentified.

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