[Circadian proteomics]

Area of Science:

• * Molecular Biology and Chronobiology
• * Proteomics and Post-Translational Modifications

Background:

• * Circadian biology studies the daily rhythms influencing physiological processes.
• * Proteomic technologies have advanced, enabling deeper analysis of protein dynamics.
• * Post-translational modifications (PTMs) like phosphorylation and acetylation are crucial for protein function and regulation.

Purpose of the Study:

• * To characterize the rhythmic liver proteome using advanced in vivo proteomics.
• * To identify novel rhythmic biological processes in the liver.
• * To investigate the role of rhythmic PTMs in hepatic metabolism and signaling pathways.

Main Methods:

• * In vivo proteomics applied to whole liver and nuclear extracts.
• * High-coverage proteomic analysis to identify rhythmic proteins and PTMs.
• * Bioinformatic analysis to characterize rhythmic processes and signaling pathways.

Main Results:

• * Unprecedented coverage of the rhythmic liver proteome was achieved.
• * New rhythmic processes identified, including protein secretion, ribosome biogenesis, DNA repair, and polyploidy.
• * Rhythmic phosphorylation and acetylation patterns were characterized, linking to signaling and metabolism.

Conclusions:

• * Proteomic technologies provide powerful tools for circadian biology research.
• * The liver proteome exhibits extensive rhythmicity, impacting key cellular functions.
• * Rhythmic PTMs are integral to understanding hepatic metabolism and circadian regulation.