Related Experiment Videos
Evolutionarily conserved pattern of gene segment usage within the mammalian TCRbeta locus.
1Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore, 655 West Baltimore St, BRB 13-017, Baltimore, MD 21201, USA. Almassy@rocketmail.com
Immunogenetics
|July 8, 2003
Summary
Evolutionary conservation of recombination signal sequences in T-cell receptor genes suggests a key role for these sequences in shaping the primary T-cell receptor repertoire, crucial for T-lymphocyte selection.
Area of Science:
- Immunology
- Evolutionary Biology
- Genetics
Background:
- Antigen receptor gene rearrangement is essential for adaptive immunity.
- This process relies on the VDJ recombinase enzyme and specific DNA sequences called recombination signal sequences (RSSs).
Purpose of the Study:
- To investigate the evolutionary conservation of RSSs in T-cell receptor beta (TCR-β) genes.
- To explore the implications of RSS conservation on the structure of the primary TCR-β repertoire.
Main Methods:
- Phylogenetic analyses of TCR-β locus gene segments.
- Comparative analysis of published TCR-β gene segment usage data between humans and mice.
Main Results:
- Significant evolutionary conservation of RSSs was found flanking orthologous TCR-β gene segments in humans and mice.
- The usage patterns of these conserved gene segments in the primary TCR-β repertoire also show similar conservation between species.
Conclusions:
- Interactions between VDJ recombinase and RSSs play a critical, underestimated role in shaping the combinatorial antigen receptor repertoire.
- This conserved repertoire pattern may be vital for effective selection of immature T lymphocytes across mammalian species.