DCAF14 promotes stalled fork stability to maintain genome integrity

Area of Science:

• Molecular Biology
• Genetics
• Cell Biology

Background:

• Replication stress can destabilize DNA replication forks, threatening genome integrity.
• Replication fork protection mechanisms stabilize stalled forks and prevent DNA degradation.

Purpose of the Study:

• To identify novel factors involved in the replication stress response.
• To elucidate the role of DDB1- and CUL4-associated factor 14 (DCAF14) in stabilizing stalled replication forks.

Main Methods:

• Protein identification and characterization.
• Localization studies at stalled replication forks.
• Assessment of genome integrity and DNA repair pathways.

Main Results:

• DCAF14, a substrate receptor for the CRL4 E3 ligase complex, was identified.
• DCAF14 rapidly localizes to stalled replication forks.
• CRL4^DCAF14 promotes genome integrity by preventing fork collapse into double-strand breaks (DSBs) in a RAD51-dependent manner.
• CRL4^DCAF14 protects nascent DNA from MRE11 and DNA2 nucleases.

Conclusions:

• DCAF14 is a key component of the replication stress response.
• DCAF14, via the CRL4 complex, stabilizes stalled replication forks and maintains genome integrity.
• The CRL4^DCAF14-mediated pathway is essential for protecting nascent DNA from nucleases during replication stress.