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Related Experiment Videos

Coding sequence composition flanking either signal element alters V(D)J recombination efficiency

N V Boubnov1, Z P Wills, D T Weaver

  • 1Division of Tumor Immunology, Dana-Farber Cancer Institute, Boston, MA 02115, USA.

Nucleic Acids Research
|March 25, 1995
PubMed
Summary
This summary is machine-generated.

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DNA sequences with long stretches of A or T near recombination signal sequences (RSS) significantly reduce V(D)J recombination. This disruption affects recombinase action, impacting gene rearrangement in lymphocytes.

Area of Science:

  • Molecular Biology
  • Immunology
  • Genetics

Background:

  • V(D)J recombination is a crucial process for adaptive immune system development.
  • Recombination signal sequences (RSS) guide the V(D)J recombination machinery to specific DNA sites.

Purpose of the Study:

  • To investigate the impact of DNA composition flanking RSS on V(D)J recombination efficiency.
  • To determine how specific DNA sequences affect the activity of the V(D)J recombinase.

Main Methods:

  • Constructing DNA substrates with varying sequences flanking RSS.
  • Analyzing V(D)J recombination efficiency and cleavage precision in modified substrates.
  • Comparing enzymatic activity at normal and modified RSS.

Main Results:

Related Experiment Videos

  • Poly(A) or poly(T) stretches adjacent to RSS can decrease V(D)J recombination up to 100-fold.
  • Cleavage at the correct positions still occurs, but overall recombination is inhibited.
  • The presence of inhibitory homopolymers disrupts recombinase action at both cleavage sites.

Conclusions:

  • The DNA sequence composition flanking RSS plays a critical role in regulating V(D)J recombination.
  • Specific DNA motifs, like A/T homopolymers, can severely impair recombinase function, affecting lymphocyte development.
  • Understanding these regulatory mechanisms is vital for comprehending immune system gene assembly.