The DNA repair complex Ku70/86 modulates Apaf1 expression upon DNA damage

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• Apaf1 is central to the intrinsic apoptosis pathway, forming the apoptosome to activate caspases.
• Regulation of Apaf1 expression is critical for controlling cell death under various conditions.

Purpose of the Study:

• To identify novel regulators of Apaf1 transcription.
• To investigate the role of Ku70/86 in Apaf1 gene regulation.

Main Methods:

• Analysis of Apaf1 promoter mutants.
• Demonstration of Ku70/86 binding to a specific repressing element on the Apaf1 promoter.
• Assessment of Ku70/86-Apaf1 promoter interaction dynamics following DNA damage.

Main Results:

• A novel repressing element within the Apaf1 promoter was identified.
• Ku70/86 was found to bind this element, downregulating Apaf1 transcription.
• Ku70/86 binding to the Apaf1 promoter is modulated by DNA damage, affecting Apaf1 expression and apoptosis.

Conclusions:

• Ku70/86 acts as a novel repressor of Apaf1 transcription by binding to a specific promoter element.
• This interaction influences the apoptosome pathway, impacting cell death and survival.
• Ku70/86 plays a dual role in DNA repair and apoptosis regulation.