Related Experiment Video
Updated: Jun 28, 2025

Author Spotlight: Unveiling the Role of SNF2L in Replication Fork Stability and Genome Duplication
Published on: August 23, 2024
PTIP UFMylation promotes replication fork degradation in BRCA1-deficient cells
1Guangdong Key Laboratory for Genome Stability & Disease Prevention and Carson International Cancer Center, Marshall Laboratory of Biomedical Engineering, Shenzhen University Medical School, Shenzhen, China; Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, School of Biomedical Engineering, Shenzhen University Medical School, Shenzhen, China.
Homologous recombination deficiency in breast cancer cells can be targeted by PARP inhibitors. PTIP UFMylation promotes DNA degradation at stalled replication forks, conferring chemoresistance in BRCA1-deficient cells.
Area of Science:
- Molecular Biology
- Genetics
- Cancer Research
Background:
- Homologous recombination deficiency (HRD) due to BRCA1/2 mutations creates synthetic lethality with poly-(ADP)-ribose polymerase (PARP) inhibitors.
- The mechanism by which PTIP regulates replication fork stability in BRCA1-deficient cells is not fully understood.
Purpose of the Study:
- To investigate the role of UFMylation in regulating replication fork stabilization in BRCA1-deficient cells.
- To elucidate the mechanism of PTIP in conferring chemoresistance.
Main Methods:
- In vitro analyses including denaturing co-immunoprecipitation.
- Cell viability assays.
- BRCA1 knockdown and PTIP/UFL1 depletion studies.
Main Results:
- Replication stress induces PTIP UFMylation.
- PTIP UFMylation promotes end resection and nascent DNA degradation at stalled replication forks in BRCA1-deficient cells.
- Depletion of PTIP or UFL1 reduces sensitivity to PARP inhibitors in BRCA1-deficient cells.
Conclusions:
- PTIP UFMylation is a novel mechanism regulating replication fork stability.
- PTIP UFMylation confers chemoresistance in BRCA1-deficient cells, offering potential therapeutic targets.
Related Concept Videos
Restarting Stalled Replication Forks
The DNA Replication Fork
DNA Damage can Stall the Cell Cycle
Translesion DNA Polymerases
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
Homologous Recombination
Long-patch Base Excision Repair

