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A mouse strain defective for alphabeta versus gammadelta T cell lineage commitment
Elisabeth Mertsching1, Andrea L Wurster, Carol Katayama
1Department of Biology and Cancer Center, The Howard Hughes Medical Institute, and Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla 92093, USA.
International Immunology
|August 31, 2002
Summary
A new mutant mouse model reveals defects in T cell lineage commitment, leading to an imbalance of alphabeta and gammadelta T cells. This study highlights impaired regulation of T cell receptor expression.
Area of Science:
- Immunology
- Developmental Biology
- Genetics
Background:
- T cell development involves a critical lineage commitment step balancing alphabeta and gammadelta T cell populations.
- Proper regulation prevents dual T cell receptor (TCR) expression within T cell subsets.
Purpose of the Study:
- To investigate the genetic basis of T cell lineage commitment defects.
- To characterize a novel mutant mouse strain exhibiting an aberrant T cell population balance.
Main Methods:
- Genetic mapping of a transgene insertion and chromosomal deletion to chromosome 10.
- Analysis of thymocyte populations using flow cytometry and T cell receptor (TCR) expression.
- Gene expression profiling of early thymocytes via gene array technology.
Main Results:
- Mutant mice display reduced alphabeta CD4 T cells and nearly absent alphabeta CD8 T cells.
- Abnormal gammadelta TCR-expressing subsets found within CD4 and CD8 populations in the thymus.
- Peripheral lymphoid organs show a significant infiltration of gammadelta TCR-expressing CD8 T cells (up to 75%).
- Impaired regulation preventing dual TCR expression was identified.
Conclusions:
- The mutant strain demonstrates profound disregulation of the alphabeta versus gammadelta lineage decision.
- This disregulation occurs independently of successful gene rearrangements.
- The findings provide insights into the genetic control of T cell lineage commitment and TCR expression.