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Induction and Assessment of Class Switch Recombination in Purified Murine B Cells
09:49

Induction and Assessment of Class Switch Recombination in Purified Murine B Cells

Published on: August 13, 2010

Class switch recombination: a friend and a foe.

Efrat Edry1, Doron Melamed

  • 1Department of Immunology, Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.

Clinical Immunology (Orlando, Fla.)
|May 15, 2007
PubMed
Summary

Antibody effector functions rely on heavy chain constant regions (CH). Class switch recombination (CSR) replaces the mu constant region with other isotypes, but can cause B cell malignancies and autoimmunity.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Antibody effector functions are dictated by the heavy chain constant region (CH).
  • During class switch recombination (CSR), the initially expressed mu constant region (Cmu) is replaced by downstream isotypes like Cgamma, Calpha, or Cepsilon.
  • The murine immunoglobulin heavy chain (IgH) locus comprises eight distinct CH genes.

Purpose of the Study:

  • To review the fundamental mechanism of class switch recombination (CSR).
  • To discuss the adverse outcomes associated with CSR, including chromosomal translocations and B cell malignancies.
  • To explore the link between CSR and susceptibility to autoimmunity.

Main Methods:

  • Review of existing literature on class switch recombination.
  • Analysis of the molecular mechanisms underlying CSR.
  • Examination of the role of CSR in B cell development and disease.

Main Results:

  • CSR involves recombination between repetitive switch (S) region sequences, leading to the deletion of intervening DNA.
  • While CSR is essential for antibody diversification, it can also lead to aberrant chromosomal translocations.
  • These translocations are implicated in the generation of B cell malignancies and increased susceptibility to autoimmunity.

Conclusions:

  • Class switch recombination (CSR) is a critical process for generating diverse antibody effector functions.
  • However, the CSR mechanism poses a risk for genomic instability, contributing to B cell cancers and autoimmune diseases.
  • Understanding CSR is vital for developing therapeutic strategies against associated malignancies and autoimmune conditions.