The PIDDosome, DNA-damage-induced apoptosis and beyond

Area of Science:

• Molecular Biology
• Cellular Signaling
• Apoptosis Research

Background:

• P53-induced protein with a death domain (PIDD) was initially identified as a p53-responsive gene product containing a death domain (DD).
• PIDD was recognized as the central component of the PIDDosome, a platform that activates caspase-2, suggesting a role in apoptosis following DNA damage.

Purpose of the Study:

• To review the evolving understanding of PIDD's functions beyond its initial role in apoptosis.
• To explore the diverse molecular complexes and signaling pathways involving PIDD.
• To summarize the intricate regulatory mechanisms governing PIDD activity.

Main Methods:

• Literature review of studies on PIDD and PIDDosome complexes.
• Analysis of research on PIDD's interactions with other proteins.
• Examination of studies investigating PIDD's post-translational modifications and functional fragments.

Main Results:

• PIDD's function extends beyond apoptosis to include roles in DNA repair and nuclear factor-κB (NF-κB) signaling.
• New PIDDosome complexes and interaction partners continue to be discovered, expanding its functional repertoire.
• PIDD exhibits complex regulation through transcriptional control, alternative splicing, protein interactions, and post-translational cleavage into active fragments.

Conclusions:

• PIDD is a versatile protein with multifaceted roles in cellular processes.
• Its function is tightly regulated by intricate mechanisms, allowing for fine-tuning of cellular responses.
• Further research is necessary to fully elucidate PIDD's functions and resolve conflicting findings.