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The nonamer code for RAG-mediated recombination in vivo.

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The RAG1/2 proteins initiate adaptive immunity by recognizing DNA sequences. This study reveals that nonamer sequences, not just the consensus, significantly influence RAG activity and its off-target effects in immune cells.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • V(D)J recombination, initiated by RAG1/2 proteins, is crucial for adaptive immunity.
  • Recombination signal sequences (RSSs) contain conserved heptamer and nonamer motifs separated by a spacer.
  • RSS promiscuity leads to RAG off-target activity at cryptic RSSs (cRSSs), causing DNA damage and cancer.

Purpose of the Study:

  • To characterize nonamer sequence properties that support RAG-mediated recombination.
  • To understand the variability in nonamer sequences within physiological RSSs and cRSSs.
  • To elucidate the mechanisms underlying RAG off-target binding and its implications.

Main Methods:

  • High-throughput screening to analyze nonamer sequence functionality.
  • Assessment of RAG binding affinity and nucleosome interaction.
  • Comparative analysis of canonical RSSs and genomic cRSSs.

Main Results:

  • The consensus nonamer (5 -ACAAAAACC) is functional, but many non-consensus sequences also support high recombination rates.
  • Functional nonamers balance RAG binding affinity (via a purine-A/T-purine motif) and nucleosome repulsion.
  • Genomic cRSS nonamers often mimic canonical ones through nucleosome-repelling properties.

Conclusions:

  • A model for physiological RAG activity and off-target effects is proposed.
  • Understanding nonamer variability enhances knowledge of immune repertoire formation.
  • This research sheds light on the genetic basis of lymphoid cancers.