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Somatic diversification of IgH genes in rabbit
1Department of Microbiology and Immunology, Loyola University at Chicago, Maywood, Illinois 60153, USA. kknight@luc.edu
Immunological Reviews
|May 29, 1998
Summary
Rabbits reveal key insights into antibody diversity, showing early life gene diversification in B cells through gene conversion and mutation. This process, occurring in gut-associated lymphoid tissues, shapes the immune system throughout life.
Area of Science:
- Immunology
- Genetics
- Molecular Biology
Background:
- Antibody diversity is a major immunologic puzzle.
- Rabbit immunoglobulin heavy chain (IgH) antibody repertoire is primarily shaped by B cells using a common germline VH-gene segment.
- Somatic diversification of VDJ genes in B lymphocytes is crucial for antibody repertoire development.
Purpose of the Study:
- To elucidate the genetic control of antibody diversity in rabbits.
- To understand the mechanisms of VDJ gene diversification in early rabbit life.
- To explore how the antibody repertoire is maintained in adult rabbits.
Main Methods:
- Analysis of VDJ gene rearrangements in rabbit B cells.
- Investigation of somatic diversification mechanisms, including gene conversion and somatic hypermutation.
- Discussion of the molecular mechanisms of Ig gene conversion, potentially involving RAD51.
Main Results:
- Rabbit B cells predominantly use a single germline VH-gene segment for VDJ rearrangements.
- Somatic diversification of VDJ genes occurs early in life via gene conversion and hypermutation.
- Diversification is linked to gut-associated lymphoid tissues and microbial antigens.
Conclusions:
- Rabbits serve as a model for understanding antibody diversity and its genetic control.
- Early life diversification mechanisms establish the antibody repertoire, which is maintained throughout adulthood.
- The molecular basis of somatic gene conversion in Ig genes is being investigated, with potential roles for enzymes like RAD51.