Cellular response to endogenous DNA damage: DNA base modifications in gene expression regulation

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Genetic information integrity is threatened by genotoxic insults like oxidation, alkylation, and deamination, causing DNA damage.
• DNA damage disrupts DNA replication fidelity and interferes with transcription processes.
• The DNA damage response (DDR) involves transcriptional inhibition, DNA repair activation, and chromatin remodeling to safeguard cellular functions.

Purpose of the Study:

• To investigate cellular responses to endogenous DNA damage, focusing on DNA glycosylases and the Base Excision Repair (BER) pathway.
• To understand the interplay between BER, DDR factors, and transcription.
• To explore the roles of epigenetic marks like 5-hydroxymethylcytosine and 8-oxoguanine in DNA damage and repair.

Main Methods:

• Literature review and synthesis of current research on DNA damage, repair pathways, and transcription.
• Analysis of the roles of DNA glycosylases in cellular responses to DNA damage.
• Discussion of the regulatory functions of epigenetic marks in the context of DNA damage and repair.

Main Results:

• DNA damage response involves coordinated efforts between transcription and DNA repair mechanisms.
• DNA glycosylases and the Base Excision Repair (BER) pathway are crucial in managing DNA damage during transcription.
• Epigenetic marks, previously viewed solely as damage, are now recognized for their regulatory roles.

Conclusions:

• The classical view of DNA damage as purely detrimental is evolving.
• DNA glycosylases function as dynamic regulators of transcription, bridging DNA repair and gene expression.
• A coordinated cellular strategy involving DNA repair and epigenetic regulation maintains genomic stability and cellular function.