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Characterization of DNA-PK-bound end fragments using GLASS-ChIP.

Rajashree A Deshpande1, Tanya T Paull1

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

Methods in Enzymology
|November 15, 2021
PubMed
Summary
This summary is machine-generated.

The human Mre11-Rad50-Nbs1 (MRN) complex cleaves DNA ends, a process enhanced by DNA-dependent Protein Kinase (DNA-PK). A new GLASS-ChIP method identifies these DNA cleavage sites near DNA-PK binding sites.

Keywords:
DNA repairDNA-PKDouble-strand breakMRN

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The Mre11-Rad50-Nbs1 (MRN) complex plays a critical role in DNA repair and genome stability.
  • Endonucleolytic cleavage of DNA ends is a key step in DNA double-strand break processing.
  • DNA-dependent Protein Kinase (DNA-PK) is known to interact with DNA repair factors.

Purpose of the Study:

  • To investigate the mechanism by which DNA-PK influences MRN complex-mediated DNA end cleavage.
  • To develop a novel method for isolating and identifying specific DNA fragments associated with DNA-PK and MRN activity.
  • To map the genomic locations of MRN endonucleolytic cleavage sites in relation to DNA-PK binding sites.

Main Methods:

  • Utilized a modified Gentle Lysis and Size Selection chromatin immunoprecipitation (GLASS-ChIP) protocol.
  • Isolated DNA-PK-bound fragments released from chromatin in human cells.
  • Employed real-time PCR and next-generation sequencing for site identification.

Main Results:

  • Successfully isolated DNA fragments bound by DNA-PK that were released from chromatin.
  • Identified specific genomic sites of MRN endonucleolytic cleavage.
  • Demonstrated that these cleavage sites are located adjacent to DNA-PK binding sites.

Conclusions:

  • DNA-PK promotes the endonucleolytic cleavage activity of the MRN complex on DNA ends.
  • The GLASS-ChIP method is effective for identifying sites of MRN cleavage associated with DNA-PK.
  • This provides a new tool for studying DNA repair mechanisms and genome integrity.