The DNA damage response during an unperturbed S-phase

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• DNA replication is essential for cell division and genome integrity.
• Cells possess a DNA damage response (DDR) to cope with replication stress and DNA damage.
• The DDR involves conserved proteins and signaling pathways that maintain genome stability.

Purpose of the Study:

• To review the role of DDR proteins and pathways in regulating normal S-phase progression.
• To highlight how pathways identified in response to DNA damage also function in unperturbed DNA replication.
• To emphasize the maintenance of genome integrity during normal S-phase.

Main Methods:

• This review synthesizes recent experimental data and literature.
• Focuses on key proteins and signaling pathways involved in DNA replication and damage response.
• Examines the regulation of S-phase progression under normal and stressed conditions.

Main Results:

• Pathways originally identified for DNA damage response are active during normal S-phase.
• These pathways manage low levels of DNA lesions and aberrant structures arising during replication.
• Conserved proteins and signaling cascades ensure faithful DNA duplication and genome stability.

Conclusions:

• The DNA damage response is not solely for acute insults but is integral to normal S-phase regulation.
• Key DDR components play a dual role in maintaining genome integrity during both stressed and unperturbed DNA replication.
• Understanding these pathways provides insights into fundamental mechanisms of genome maintenance.