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A genetically determined insertion/deletion related polymorphism in human T cell receptor beta chain (TCRB) includes
T M Zhao1, S E Whitaker, M A Robinson
1Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, Rockville, Maryland 20852.
The Journal of Experimental Medicine
|October 1, 1994
Summary
Human T cell receptor beta chain (TCRB) gene complex exhibits polymorphism. Inserted TCRB haplotypes expand the genomic repertoire with additional TCRBV genes, potentially impacting immune responses and autoimmune disease susceptibility.
Area of Science:
- Immunogenetics
- Human genomics
- Molecular evolution
Background:
- Polymorphism in the T cell receptor beta chain (TCRB) gene complex influences immune responses.
- Variations in the number of TCRBV genes exist across different TCRB haplotypes.
Purpose of the Study:
- To investigate the insertion/deletion related polymorphism (IDRP) in the human TCRBV region.
- To characterize the genetic content and evolutionary mechanisms of TCRB haplotypes.
Main Methods:
- Comparative sequence analysis of TCRBV gene segments in inserted and deleted haplotypes.
- Identification of gene duplications and pseudogenes within the TCRBV region.
Main Results:
- Inserted TCRB haplotypes contain an additional 21.5 kb with three TCRBV genes (TCRBV7, TCRBV9, TCRBV13 families).
- Two novel TCRBV gene segments, TCRBV7S3 (functional) and TCRBV9S2(P) (pseudogene), are specific to inserted haplotypes.
- Inserted haplotypes have 63 genes (52 functional), while deleted haplotypes have 60 genes (50 functional).
- Sequence comparisons suggest both insertion and deletion events shaped the TCRBV gene complex evolution.
Conclusions:
- Inserted TCRB haplotypes result in an expanded genomic TCR repertoire.
- The presence or absence of specific TCRBV genes may influence immune system function and autoimmune disease risk.