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Updated: May 13, 2026
11:12
Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity
Published on: April 11, 2019
A one-shot germinal center model under protein structural stability constraints
Sana Raoof1, Muyoung Heo, Eugene I Shakhnovich
1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.
Physical Biology
|March 16, 2013
Summary
A new computational model shows that a one-way germinal center reaction, not cell recycling, effectively drives B cell maturation into antibody-producing cells. This finding clarifies B cell evolution for improved immunology research.
Area of Science:
- Immunology
- Computational Biology
- Protein Science
Background:
- The germinal center reaction is crucial for generating high-affinity antibodies from low-affinity B cells.
- Experimental evidence on B cell movement within germinal centers is conflicting, with some supporting a "recycling" model and others a one-way trajectory.
Purpose of the Study:
- To develop and test a novel computational model of the germinal center reaction.
- To determine whether a one-way trajectory or a recycling model better explains B cell affinity maturation.
Main Methods:
- Developed a sequence-based, ab initio computational model incorporating protein stability and interactions.
- Modeled distinct dark zone (clonal expansion, somatic hypermutation) and light zone (antigenic selection) regions.
- Simulated B cell dynamics under both one-way and recycling scenarios.
Main Results:
- A one-shot (one-way) model successfully reproduced biologically realistic rates of affinity growth, population dynamics, and mutation profiles.
- A stochastic recycling model failed to replicate observed affinity growth, population dynamics, or mutation profiles.
- Simulated recycling led to diminished affinity gains and B cell accumulation in the dark zone.
Conclusions:
- A one-way trajectory through the germinal center is sufficient for effective B cell affinity maturation.
- B cell recycling may hinder affinity gains and disrupt normal population dynamics.
- The study provides a new computational framework for understanding B cell evolution and antibody responses.
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