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Haplotype exclusion and receptor editing: irreconcilable differences?

David Nemazee1, Annica Mårtensson, Laurent Verkoczy

  • 1Department of Immunology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA. nemazee@scripps.edu

Seminars in Immunology
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Summary
This summary is machine-generated.

Antibody gene regulation presents challenges for clonal selection by impacting receptor diversity and haplotype exclusion. However, the immune system successfully balances receptor editing and selection for antibody monospecificity.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Antibody gene features and regulation can impede critical clonal selection properties like haplotype exclusion and receptor diversity.
  • Light chain gene organization and regulation present challenges, including multiple L-chain isotypes and continued recombination during receptor editing.
  • Heavy chain gene structure appears to favor haplotype exclusion and receptor diversity.

Purpose of the Study:

  • To investigate the interplay between antibody gene organization, regulation, and the requirements of B cell receptor selection.
  • To understand how receptor editing and positive selection influence antibody gene arrangement and regulation.
  • To reconcile the apparent antagonism between mechanisms driving receptor selection and clonal selection.

Main Methods:

  • Analysis of antibody gene structure and regulation.
  • Examination of B cell development processes, including recombination and selection.
  • Comparative analysis of heavy and light chain gene organization.

Main Results:

  • Light chain gene features, such as multiple isotypes and ordered rearrangements, promote receptor editing but can hinder allelic and isotype exclusion.
  • Heavy chain gene structure supports haplotype exclusion and receptor diversity.
  • Despite complex regulatory mechanisms, B cell development achieves significant phenotypic haplotype exclusion and antibody monospecificity.

Conclusions:

  • The immune system navigates antagonistic mechanisms to achieve both receptor selection and clonal selection.
  • Receptor editing and positive selection are critical for immune tolerance and receptor functionality, shaping antibody gene regulation.
  • The balance achieved allows for receptor selection and functional B cell development despite inherent complexities in antibody gene organization.