Splicing the Clock to Maintain and Entrain Circadian Rhythms.

Area of Science:

• Chronobiology
• Molecular Biology
• Genetics

Background:

• Circadian clocks govern daily physiological and behavioral rhythms, synchronized by environmental cues like light and temperature.
• The core clock mechanism involves a transcription-translation feedback loop where clock proteins inhibit their own synthesis.
• Beyond transcriptional regulation and protein stability, other mechanisms are crucial for comprehensive clock function.

Purpose of the Study:

• To review the significant role of alternative splicing in the regulation of circadian clocks.
• To examine how alternative splicing contributes to maintaining circadian rhythms and responding to environmental stimuli, particularly temperature variations.
• To discuss the implications of alternative splicing in model organisms, starting with *Drosophila*.

Main Methods:

• Literature review focusing on alternative splicing in circadian clock mechanisms.
• Comparative analysis across different circadian model systems.
• Discussion of experimental evidence linking alternative splicing to clock function and environmental responses.

Main Results:

• Alternative splicing is a critical regulatory layer in circadian clocks, complementing transcriptional and post-translational control.
• The control of alternative splicing allows organisms to fine-tune clock protein activity and expression levels.
• Alternative splicing plays a role in adapting circadian rhythms to environmental factors, notably temperature changes.

Conclusions:

• Alternative splicing is integral to the robustness and adaptability of circadian clocks.
• Understanding alternative splicing provides deeper insights into circadian timekeeping and its environmental responsiveness.
• This regulatory mechanism is conserved across various model systems, highlighting its fundamental importance in biology.