Chromatin-remodeling factor, RSF1, controls p53-mediated transcription in apoptosis upon DNA strand breaks

Area of Science:

• Molecular Biology
• Genetics
• Cell Biology

Background:

• Remodeling and spacing factor 1 (RSF1) is a chromatin remodeler implicated in DNA damage response (DDR) and repair.
• The in vivo consequences of RSF1 deficiency in DDR and its underlying molecular mechanisms are not fully understood.
• Defective DDR is associated with neuropathological conditions.

Purpose of the Study:

• To investigate the biological role of RSF1 in the DNA damage response in vivo.
• To elucidate the molecular mechanisms by which RSF1 influences cellular integrity following DNA damage.

Main Methods:

• Development of neural-specific Rsf1 knockout mice.
• Analysis of neural apoptosis and cell death in RSF1-deficient models after DNA damage induction.
• Global transcriptome analysis of RSF1-deficient human cell lines.
• Investigation of p53/p300 complex binding and H3 acetylation at target gene promoters.

Main Results:

• RSF1 deficiency did not cause neuropathological abnormalities but protected against neural apoptosis during neurogenesis.
• RSF1-deficient cells exhibited significantly reduced cell death upon DNA damage.
• Global transcriptome analysis revealed reduced expression of p53 downstream genes in RSF1-deficient cells after DNA breaks.
• Inactivation of p53 target genes was linked to decreased p53/p300 complex binding and reduced H3 acetylation at their promoters.

Conclusions:

• RSF1 is essential for p53-dependent gene expression in response to DNA strand breaks.
• RSF1 facilitates the accessibility of the p53/p300 complex to its target genes.
• RSF1 plays a critical role in maintaining cellular integrity by modulating the DNA damage response pathway.