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Quantifying DNA End Resection in Human Cells.

Yi Zhou1, Tanya T Paull2

  • 1The Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA.

Methods in Molecular Biology (Clifton, N.J.)
|August 26, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a new quantitative PCR assay to directly measure single-stranded DNA (ssDNA) during DNA double-strand break (DSB) repair. This method precisely quantifies DNA resection efficiency, improving genomic stability studies.

Keywords:
DNA damageDNA end resectionDNA repairSingle-stranded DNA quantitation

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Area of Science:

  • Molecular Biology
  • Genomics
  • DNA Repair Mechanisms

Background:

  • DNA double-strand breaks (DSBs) are critical DNA lesions that must be repaired to maintain genomic stability.
  • Homologous recombination (HR) is a major pathway for DSB repair, initiated by DNA end resection.
  • Current methods for monitoring DSB resection in mammalian cells, such as protein or BrdU foci, indirectly assess resection by detecting single-stranded DNA (ssDNA) products.

Purpose of the Study:

  • To develop a direct, quantitative method for measuring ssDNA intermediates generated during DSB resection.
  • To provide a more precise assessment of resection extent and efficiency compared to existing indirect methods.
  • To establish a rapid assay for studying DNA repair processes in human cells.

Main Methods:

  • Development of a quantitative PCR (qPCR)-based assay.
  • Utilizes a stable cell line expressing a hormone-inducible restriction enzyme (ER-AsiSI) to induce site-specific DSBs.
  • Directly quantifies the levels of ssDNA at specific DSB sites.

Main Results:

  • The developed qPCR assay directly measures ssDNA generated by DSB resection.
  • The assay offers higher quantitative accuracy and precision in assessing resection extent and efficiency.
  • The assay is relatively rapid, completable within 3 days (excluding cell line generation).

Conclusions:

  • This novel qPCR assay provides a direct and precise method for quantifying DNA resection intermediates.
  • The assay significantly advances the study of homologous recombination and genomic stability.
  • It offers a valuable tool for researchers investigating DNA repair pathways in human cells.