MRE11 UFMylation promotes ATM activation

Area of Science:

• Molecular Biology
• Cellular Biology
• Genetics

Background:

• A robust DNA damage response (DDR) is vital for maintaining genome integrity and preventing cancer.
• DNA double-strand breaks (DSBs) are highly toxic lesions repaired via ATM kinase-mediated pathways.
• The role of ubiquitin-fold modifier 1 (UFMylation) in DDR is largely unexplored.

Purpose of the Study:

• To investigate the function of UFMylation in the DNA damage response.
• To determine if MRE11 protein is subject to UFMylation and its impact on DNA repair.

Main Methods:

• Investigated MRE11 UFMylation at K282 using biochemical assays.
• Assessed the impact of MRE11 UFMylation on MRN complex formation.
• Evaluated the role of MRE11 UFMylation in ATM activation and DNA repair via homologous recombination.
• Analyzed a pathogenic MRE11 mutation (G285C) found in uterine endometrioid carcinoma.

Main Results:

• MRE11 protein undergoes UFMylation on lysine 282 (K282).
• MRE11 UFMylation is essential for MRN complex formation and optimal ATM activation following DSBs.
• UFMylation of MRE11 is required for efficient homologous recombination repair and genome stability.
• A pathogenic MRE11 mutation (G285C) phenocopies the defects observed in UFMylation-deficient MRE11 mutants.

Conclusions:

• MRE11 UFMylation is a critical regulatory mechanism in the DNA double-strand break response.
• This modification promotes ATM activation, DNA repair, and maintains genome stability.
• MRE11 UFMylation represents a potential therapeutic target for diseases involving genomic instability.