Drosophila UTX coordinates with p53 to regulate ku80 expression in response to DNA damage

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• UTX (also known as KDM6A) is a known transcriptional coactivator crucial for developmental processes.
• Its role in DNA damage response pathways has not been fully elucidated.

Purpose of the Study:

• To investigate the function of UTX in the DNA damage response.
• To determine the molecular mechanism by which UTX influences gene expression following DNA damage.

Main Methods:

• Drosophila melanogaster models (cell culture and larvae) were used.
• Ionizing radiation (IR) was employed to induce DNA damage.
• Chromatin immunoprecipitation (ChIP) and Western blotting were utilized to assess protein interactions and epigenetic modifications.

Main Results:

• UTX upregulates the expression of the ku80 gene in response to ionizing radiation.
• UTX mediates ku80 expression via demethylation of H3K27me3 at the ku80 promoter in a p53-dependent manner.
• UTX and p53 interact physically and are recruited to the ku80 promoter together after IR exposure.

Conclusions:

• UTX plays a critical role in the DNA damage response by specifically regulating ku80 expression.
• The findings reveal a novel mechanism involving UTX, p53, and epigenetic modification in DNA repair.
• This study expands our understanding of UTX's molecular functions beyond development.