Shared Gene Targets of the ATF4 and p53 Transcriptional Networks

Area of Science:

• Molecular Biology
• Cancer Biology
• Genetics

Background:

• The p53 tumor suppressor is crucial for cell cycle arrest and apoptosis, and its dysfunction is common in cancer.
• Restoring p53 activity for tumor-specific cell death is a promising anticancer strategy.
• The integrated stress response (ISR) offers a p53-independent pathway for potential therapeutic intervention.

Purpose of the Study:

• To investigate the gene regulatory mechanisms of a p53-independent anticancer strategy targeting the ISR.
• To understand how p53 and ISR pathways converge to regulate common genes.
• To identify key transcription factors involved in the shared regulation of metabolic and proapoptotic genes.

Main Methods:

• Analysis of gene regulatory elements bound by p53 and ATF4 (an ISR effector).
• Investigating the architecture of shared gene regulatory networks.
• Identifying transcription factors controlling basal and stress-induced gene expression.

Main Results:

• The p53 and ISR pathways independently regulate common metabolic and proapoptotic genes.
• Detailed architecture of gene regulatory elements controlled by p53 and ATF4 was elucidated.
• Additional transcription factors contributing to the regulation of shared target genes were identified.

Conclusions:

• The p53 and ISR pathways converge on shared target genes, offering a p53-independent therapeutic avenue.
• Understanding these gene regulatory networks provides insights into novel anticancer strategies.
• Identified transcription factors represent potential targets for antitumor therapies.