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Related Experiment Videos

Trends in antibody sequence changes during the somatic hypermutation process.

Louis A Clark1, Skanth Ganesan, Sarah Papp

  • 1Biogen Idec Inc., 14 Cambridge Center, Cambridge, MA 02142, USA. louie@alumni.northwestern.edu

Journal of Immunology (Baltimore, Md. : 1950)
|June 21, 2006
PubMed
Summary
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Antibody maturation involves somatic hypermutation, where germline biases and selection pressures shape antibody sequences. This study reveals how germline composition influences mature antibody interfaces, rather than solely selection.

Area of Science:

  • Immunology
  • Computational Biology
  • Structural Biology

Background:

  • Antibodies (Abs) undergo somatic hypermutation to mature and improve antigen binding.
  • Understanding the germline gene repertoire and mutation processes is crucial for Ab engineering.

Purpose of the Study:

  • To computationally infer germline gene sequences from mature antibody sequences.
  • To analyze the factors influencing residue mutation patterns during antibody maturation.
  • To investigate the role of germline composition versus selection in shaping mature antibody interfaces.

Main Methods:

  • Inferred germline gene sequences using computational matching to known V(D)J genes.
  • Compared germline and mature antibody sequences structurally.
  • Analyzed mutation patterns based on germline biases, accessibility, hotspots, and selection pressures.

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Main Results:

  • Germline antibody repertoires at antigen-contacting positions are biased towards tyrosine, serine, and tryptophan.
  • These residues are enriched in mutation hotspots and decrease in abundance during maturation.
  • Mature antibody interfaces reflect germline composition; tyrosine abundance is not solely due to selection. Histidine usage increases across all regions. Stabilizing mutations like proline increase, and disulfide bonds form via cysteine mutations.

Conclusions:

  • Antibody maturation involves a conversion from non-specific binding residues to diverse types that enhance affinity and stability.
  • Germline composition significantly influences mature antibody structure and function.
  • Somatic hypermutation introduces stabilizing changes, contributing to antibody efficacy.