Histone PARylation factor 1: a review of its role in the DNA damage response

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• Poly-(ADP ribose) polymerase 1 (PARP1) and histone PARylation are established anti-cancer drug targets.
• The discovery of Histone PARylation Factor 1 (HPF1) a decade ago revolutionized understanding of PARP1 function.

Purpose of the Study:

• To review the current knowledge of the PARP1-HPF1 interaction.
• To highlight unresolved questions in the PARP1-HPF1 field.
• To emphasize the importance of this system for DNA damage response and cancer therapy.

Main Methods:

• Literature review of PARP1-HPF1 research.
• Analysis of HPF1's impact on PARP1 activity in vitro and in vivo.
• Discussion of implications for chromatin modification and DNA repair.

Main Results:

• HPF1 forms a shared active site with PARP1, contributing a catalytic residue.
• HPF1 significantly alters PARP1's substrate specificity, PAR chain synthesis, and modification sites.
• These alterations have profound effects on chromatin structure and function.

Conclusions:

• The PARP1-HPF1 interaction is a critical regulator of DNA damage response.
• Understanding this system is key to developing more effective PARP1 inhibitors for cancer treatment.
• Further research is needed to fully elucidate the complexities of HPF1-mediated PARP1 regulation.