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Evolution in microcosm: the rapid somatic diversification of lymphocytes
Annales D'Immunologie
|June 1, 1976
Summary
Vertebrates generate diverse lymphocytes throughout life, enabling specific responses to novel antigens. This study explores the rapid variation within antibody-forming cells, revealing a dynamic immune system shaped by stimulation and suppression.
Area of Science:
- Immunology
- Cell Biology
- Genetics
Background:
- The immune system's ability to respond to novel antigens is crucial for host defense.
- Vertebrates utilize a population of lymphocytes for adaptive immunity, contrasting with invertebrate strategies.
- Understanding the mechanisms and timing of lymphocyte variation is vital for immunology.
Purpose of the Study:
- To investigate the occurrence and rate of lymphocyte variation, particularly in antibody-forming cells.
- To provide direct experimental evidence for or against rapid variation in stimulated lymphocytes.
- To explore the implications for a new immunological paradigm.
Main Methods:
- Contrasting vertebrate and invertebrate immune strategies.
- Analyzing indirect evidence for lymphocyte variation.
- Employing experimental approaches based on detecting cross-reactive antibody specificity from single cells.
Main Results:
- Demonstrated rapid variation within single clones of proliferating antibody-forming cells (approx. 1 variation per 30 divisions).
- Showed that uncommon antibody-forming cell specificities at the peak of a primary response were absent earlier.
- Provided direct evidence supporting the concept of rapid lymphocyte variation.
Conclusions:
- The vertebrate immune repertoire is a dynamic product of lymphocyte evolution under selective pressures.
- A new immunological paradigm may involve a limited set of germ-line receptors undergoing extensive proliferation and variation.
- Antigenic stimulation and active suppression shape the immune response and repertoire.