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Related Experiment Videos

Targeted transposition by the V(D)J recombinase.

Gregory S Lee1, Matthew B Neiditch, Richard R Sinden

  • 1Department of Immunology, Howard Hughes Medical Institute, Baylor College of Medicine, Houston, Texas 77030, USA.

Molecular and Cellular Biology
|March 9, 2002
PubMed
Summary

The V(D)J recombinase

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • The V(D)J recombinase enzyme complex is crucial for adaptive immunity.
  • This enzyme mediates DNA cleavage and joining at specific recombination signal sequences.
  • RAG proteins can integrate DNA signal ends into unrelated target DNA molecules.

Purpose of the Study:

  • To investigate the mechanism of target selection by RAG proteins.
  • To explore the role of DNA structural features in RAG-mediated transposition.
  • To elucidate the formation of hybrid joints and their potential role in oncogenesis.

Main Methods:

  • In vitro assays to study RAG protein interactions with DNA.
  • Analysis of DNA transposition events involving distorted DNA structures.
  • Modeling of V(D)J recombination and its aberrant outcomes.

Main Results:

  • RAG protein-mediated DNA transposition is significantly enhanced by distorted DNA structures like hairpins.
  • RAG proteins specifically target these distorted DNA structures.
  • A novel mechanism for hybrid joint formation involving signal ends and hairpin coding ends was identified.

Conclusions:

  • RAG protein target selection involves recognition of distorted DNA structures.
  • Hybrid joints may form in vivo via transposition, contributing to oncogenic translocations.
  • The V(D)J recombinase may play a more significant role in certain lymphomas than previously understood.
Keywords:
Non-programmatic

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