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Related Experiment Video

Updated: Jan 8, 2026

Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches
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Somatic hypermutation patterns are shaped by both motif position and sequence grammar.

Bianca Bartl1, Ursula E Schoeberl1,2,3, Renan Valieris4

  • 1Research Institute of Molecular Pathology (IMP), Campus-Vienna-Biocenter 1, 1030, Vienna, Austria.

The EMBO Journal
|December 11, 2025
PubMed
Summary

Somatic hypermutation relies on activation-induced deaminase (AID) to mutate DNA. A newly discovered sequence grammar dictates how AID binds DNA, influencing mutation outcomes and antibody maturation.

Keywords:
Activation Induced DeaminaseDNA Sequence GrammarMolecular Dynamics SimulationRamos CellsSomatic Hypermutation

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Somatic hypermutation (SHM) is vital for antibody maturation against pathogens and vaccines.
  • Activation-induced deaminase (AID) drives SHM by targeting cytosines in WRCH motifs within single-stranded DNA.
  • Sequence context flanking WRCH motifs influences mutation frequency, but this 'sequence grammar' is poorly understood.

Purpose of the Study:

  • To elucidate the nature of the sequence grammar governing AID activity.
  • To understand how flanking sequences and WRCH motif identity modulate AID's DNA interactions.

Main Methods:

  • Utilized molecular dynamics simulations to analyze AID-DNA interactions.
  • Investigated the impact of sequence context and WRCH motif variations on mutagenesis.
  • Assessed the effect of repositioning motifs and their contexts within immunoglobulin variable regions.

Main Results:

  • Identical sequence contexts can significantly alter mutagenesis depending on the specific WRCH motif.
  • Sequence context and WRCH motif identity modulate AID's binding mode and strength with single-stranded DNA.
  • Altering motif and context positions within the variable region impacts mutability.

Conclusions:

  • A motif-specific sequence grammar governs the mutability of AID target cytosines.
  • This grammar influences AID's DNA binding and is crucial for SHM outcomes.
  • Understanding this grammar is key to predicting and potentially manipulating antibody maturation.