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Dual T cell receptor beta chain expression on human T lymphocytes
F Davodeau1, M A Peyrat, F Romagné
1Institut National de la Santé et de la Recherche Médicale U211, Institut de Biologie, Nantes, France.
The Journal of Experimental Medicine
|April 1, 1995
Summary
Nearly 1% of human T lymphocytes express two T cell receptor (TCR) beta chains, challenging the necessity of allelic exclusion for ensuring lymphocyte specificity and immune regulation.
Area of Science:
- Immunology
- Molecular Biology
- T cell biology
Background:
- Allelic exclusion is a crucial mechanism in the immune system, hypothesized to ensure precise lymphocyte repertoire selection and specificity.
- This process has been demonstrated for immunoglobulin (Ig) and T cell receptor (TCR) beta chain genes, maintaining clonal monospecificity.
Purpose of the Study:
- To investigate the frequency of T lymphocytes that escape allelic exclusion and express dual TCR beta chains.
- To assess the immunological consequences of expressing two distinct TCR beta chains on human T lymphocytes.
Main Methods:
- Analysis of human T lymphocyte populations to identify dual TCR beta chain expressors.
- Assessment of superantigenic reactivities associated with dual TCR beta chain expression.
Main Results:
- Approximately 1% of human T lymphocytes were found to escape allelic exclusion, expressing two distinct surface TCR beta chains.
- These dual beta chain expressors exhibited distinct superantigenic reactivities.
- The high frequency of these cells did not correlate with significant immune dysregulations.
Conclusions:
- The findings question the absolute requirement for strict allelic exclusion to maintain clonal monospecificity in T lymphocytes.
- The immune system may tolerate dual TCR beta chain expression without compromising overall immune function or specificity.