DNA Damage Tolerance Pathways in Human Cells: A Potential Therapeutic Target

Area of Science:

• Molecular Biology
• Genetics
• Cancer Research

Background:

• DNA lesions from internal and external sources are common.
• Unrepaired DNA damage stalls replication forks, causing genomic instability.
• DNA damage tolerance (DDT) pathways are crucial for replication completion and preventing strand breaks.

Purpose of the Study:

• To review major DDT pathways.
• To explore the link between DNA damage tolerance and carcinogenesis.
• To discuss therapeutic strategies targeting translesion synthesis (TLS) polymerases.

Main Methods:

• Review of existing literature on DNA damage tolerance pathways.
• Analysis of the roles of translesion synthesis (TLS) and homology-directed damage tolerance.
• Exploration of the connection between DDT, mutagenesis, and cancer development.

Main Results:

• TLS polymerases bypass DNA lesions, often causing mutations and contributing to cancer and chemoresistance.
• Homology-directed DDT uses the sister strand for error-free lesion bypass.
• Small molecule inhibitors of TLS polymerases show promise in combination cancer therapy.

Conclusions:

• DDT pathways are critical for maintaining genome stability and replication.
• Targeting TLS polymerases offers a potential therapeutic strategy for cancer treatment.
• Further understanding of DDT mechanisms can lead to novel anti-cancer drug development.