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Updated: Aug 9, 2026
Induction and Assessment of Class Switch Recombination in Purified Murine B Cells
Published on: August 14, 2010
Models for the dynamics and order of immunoglobulin isotype switching
1Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel.
Insights
Class switch recombination (CSR) in B cells is driven by cell divisions, not time. The choice of antibody isotype depends on division probability and proximity to the target gene.
Area of Science:
- Immunology
- Molecular Biology
- Computational Biology
Background:
- Class switch recombination (CSR) is a crucial immune process enabling antibody diversification.
- Previous understanding suggested CSR timing was linked to stimulation duration.
- The factors influencing CSR probability and isotype selection remained incompletely understood.
Purpose of the Study:
- To investigate the relationship between cell division number and CSR probability.
- To elucidate the mechanism of antibody isotype switching in B cells.
- To determine if gene proximity influences the choice of post-switch isotype.
Main Methods:
- Computer simulations modeling CSR dynamics in B cell populations.
- Analysis of CSR probability as a function of cell divisions.
- Evaluation of factors influencing post-switch C gene segment selection.
Main Results:
- CSR probability is directly dependent on the number of cell divisions, not elapsed time.
- Switching probability per division increases with the number of divisions a cell undergoes.
- Isotype choice is biased towards C gene segments located closer to the pre-switch gene.
Conclusions:
- Cell division count is a primary determinant of CSR, overriding temporal cues.
- B cell isotype selection is influenced by both division-dependent switching probabilities and gene locus accessibility.
- The findings provide a new mechanistic framework for understanding antibody class switching.
Abstract:
Experiments show that class switch recombination (CSR) depends on the number of divisions that the cell has performed rather than on the time since stimulation. Using computer simulations of CSR dynamics in B cell populations, we addressed the following questions. How does the probability of CSR depend on the number of divisions that a cell has performed? How does the cell decide which isotype to switch to? Does this decision depend on the distance between the genes of the pre-switch and the post-switch isotype? Our results indicate that post-switch isotype choice may be determined indirectly by the probabilities of division (which is fixed) and of switching per division (which increases as a function of the number of divisions that a cell performs), and more directly by a bias in the choice of the post-switch C gene segment towards those proximal to the pre-switch C gene.
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