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Related Experiment Video

Updated: Sep 3, 2025

Nucleoside Triphosphates - From Synthesis to Biochemical Characterization

Nucleoside Triphosphates - From Synthesis to Biochemical Characterization

Published on: April 3, 2014

TOPBPing up DSBs with PARylation.

Shrabasti Roychoudhury¹, Dipanjan Chowdhury²

¹Department of Radiation Oncology, Dana-Farber Cancer Institute, Boston, MA 02115, USA.

|July 22, 2022

Summary

This summary is machine-generated.

HIV Tat-specific factor 1, an RPA PARylation reader, recruits Topoisomerase IIβ-binding protein 1 to DNA double-strand break sites during S phase. This interaction promotes homologous recombination repair, a critical cell cycle process.

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Area of Science:

Molecular Biology
Cell Cycle Regulation
DNA Repair Mechanisms

Background:

DNA double-strand breaks (DSBs) are highly toxic lesions.
Homologous recombination (HR) is a major pathway for repairing DSBs, primarily active during the S and G2 phases.
The precise regulation of HR factors at DSB sites is crucial for genomic stability.

Purpose of the Study:

To investigate the role of HIV Tat-specific factor 1 (HTSF1) in DNA double-strand break repair.
To identify proteins recruited by HTSF1 to DSB sites.
To elucidate the mechanism by which HTSF1 influences homologous recombination.

Main Methods:

Cellular localization studies using immunofluorescence.
Co-immunoprecipitation assays to identify protein interactions.
Cell cycle analysis to determine the timing of HTSF1 recruitment.
Assessment of homologous recombination efficiency using reporter assays.

Main Results:

HTSF1, an RPA PARylation reader, is recruited to DSB sites.
HTSF1 specifically recruits Topoisomerase IIβ-binding protein 1 (TOPBP1) to DSB sites.
This recruitment is restricted to the S phase of the cell cycle.
The HTSF1-TOPBP1 interaction promotes homologous recombination.

Conclusions:

HTSF1 acts as a crucial mediator in the S-phase-specific recruitment of TOPBP1 to DSBs.
This mechanism highlights a novel regulatory pathway for homologous recombination.
Understanding this process is vital for comprehending genomic integrity maintenance.