Mechanisms of mutagenesis induced by DNA lesions: multiple factors affect mutations in translesion DNA synthesis

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Environmental mutagens induce DNA damage, leading to mutagenesis.
• The intricate mechanisms underlying mutagenesis are not fully understood.
• DNA lesions include base/sugar modifications and epigenetic alterations.

Purpose of the Study:

• To review the mechanisms of mutagenesis induced by DNA lesions.
• To explore the multifaceted effects on translesion DNA synthesis (TLS).
• To elucidate the roles of DNA polymerases, their motifs, and accessory proteins in mutagenesis.

Main Methods:

• Literature review of mutagenesis mechanisms.
• Analysis of DNA polymerases' roles in translesion DNA synthesis (TLS).
• Examination of protein interactions and accessory proteins in the DNA replisome.

Main Results:

• DNA polymerases generate mutation spectra via misincorporation and frameshift errors during TLS.
• DNA polymerase structure and accessory proteins significantly influence mutation outcomes.
• Cellular collaborations involving multiple DNA polymerases and proteins reduce in vivo mutagenesis.

Conclusions:

• Understanding DNA lesion-induced mutagenesis requires considering DNA polymerases and cellular context.
• TLS mechanisms are complex, influenced by various protein factors.
• In vivo, coordinated cellular processes effectively limit mutagenesis, despite DNA damage.