DNA damage-induced mutation: tolerance via translesion synthesis

Area of Science:

• Molecular Biology
• Genetics
• Cancer Research

Background:

• Translesion synthesis (TLS) is crucial for mutagenesis induced by DNA damage in Saccharomyces cerevisiae.
• TLS acts as a DNA damage tolerance mechanism rather than an error-prone repair pathway.
• Key proteins involved in yeast TLS are encoded by the RAD6 epistasis group, including specific DNA polymerases.

Purpose of the Study:

• To review and link evidence of translesion synthesis in yeast to findings in mammalian cells.
• To explore the role of nonreplicative DNA polymerases in DNA damage tolerance.
• To connect TLS mechanisms to cancer risk in humans.

Main Methods:

• Review of existing literature on translesion synthesis in yeast and mammalian cells.
• Comparison of homologous proteins and pathways between yeast and mammals.
• Analysis of the link between error-free and error-prone TLS and cancer risk.

Main Results:

• TLS is essential for most damage-induced mutations in yeast, arising from DNA lesion tolerance.
• Homologues of yeast RAD6 group proteins, including DNA polymerases, are found in mammalian cells.
• Error-free TLS in humans is associated with reduced UV-induced skin cancer risk, while error-prone TLS may increase it.

Conclusions:

• Translesion synthesis is a conserved mechanism for DNA damage tolerance across yeast and mammals.
• The balance between error-free and error-prone TLS plays a significant role in modulating cancer risk.
• Understanding TLS pathways offers insights into cancer prevention and treatment strategies.