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Related Experiment Videos

Postcleavage sequence specificity in V(D)J recombination.

E A Agard1, S M Lewis

  • 1Program in Genetics and Genomic Biology, Hospital for Sick Children Research Institute, Toronto, Ontario, Canada M5G 1X8.

Molecular and Cellular Biology
|June 24, 2000
PubMed
Summary
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V(D)J recombination fidelity is maintained by detecting inaccurate DNA targeting even after cleavage. This late-stage error correction prevents oncogenic rearrangements in differentiating lymphocytes.

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • V(D)J recombination is essential for adaptive immunity but can lead to oncogenic DNA rearrangements if errors occur.
  • Initial fidelity is established by recombination proteins distinguishing between authentic and inauthentic recombination signal sequences.
  • This initial discrimination is imperfect, necessitating further mechanisms to prevent pathogenic outcomes.

Purpose of the Study:

  • To investigate if the V(D)J recombination machinery can detect and correct inaccurately targeted DNA sequences after the initial cleavage step.
  • To understand the basis of sequence specificity in later stages of V(D)J recombination.

Main Methods:

  • In vivo studies examining the resolution of recombination intermediates.
  • Analysis of sequence specificity in post-cleavage steps of V(D)J recombination.

Related Experiment Videos

Main Results:

  • Post-cleavage steps in V(D)J recombination demonstrate sequence specificity.
  • Noncanonical DNA sequences do not efficiently support the resolution of recombination intermediates in vivo.
  • Interventions to correct mistargeting events likely occur late in the joining process.

Conclusions:

  • The V(D)J recombination machinery possesses a late-stage quality control mechanism that operates after DNA cleavage.
  • This post-cleavage specificity is crucial for enforcing fidelity during antigen receptor gene rearrangement.
  • This mechanism helps prevent oncogenic consequences arising from unintended DNA rearrangements.