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Tracking T cell clonotypes in complex T lymphocyte populations by real-time quantitative PCR using fluorogenic
Alexandra Gallard1, Gilles Foucras, Christiane Coureau
1Institut National de la Santé et de la Recherche Médicale U.563, Centre de Physiopathologie de Toulouse Purpan, Institut Claude de Préval, Hôpital Purpan, Place du Dr Baylac, 31059 Toulouse Cedex, France.
Journal of Immunological Methods
|October 16, 2002
Summary
Researchers developed a new real-time quantitative RT-PCR method to detect T cell receptor (TCR) beta chain mRNA. This technique accurately quantifies specific TCR clonotypes, offering a sensitive alternative for low-frequency T cell detection.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- T cell receptor (TCR) alpha and beta chains determine antigen specificity through gene rearrangements.
- The complementarity-determining region 3 (CDR3) is crucial for TCR interaction with peptide/MHC complexes.
- Quantifying specific T cell receptor clonotypes is essential for understanding immune responses.
Purpose of the Study:
- To apply real-time quantitative RT-PCR for detecting rearranged TCR beta chain mRNA transcripts.
- To validate a fluorogenic PCR-based method for quantifying specific TCR clonotypes.
- To provide a sensitive method for determining T cell clone frequencies.
Main Methods:
- Utilized real-time quantitative RT-PCR with BV- and BJ-specific primers and CDR3-specific TaqMan probes.
- Employed plasmids containing entire TCR beta chains as external standards for normalization.
- Quantified rearranged TCR beta chain mRNA copies relative to total TCR beta chains.
Main Results:
- Successfully validated the fluorogenic PCR method for quantifying specific TCR clonotypes.
- Demonstrated precise determination of T cell clone frequencies from 10(-2) to less than 10(-5).
- Showcased the method's applicability in analyzing CD4 T cell responses to hen egg white lysozyme (HEL) in mice.
Conclusions:
- The developed real-time quantitative RT-PCR method is accurate and sensitive for TCR clonotype quantification.
- This technique offers a valuable alternative to flow cytometry for assessing low-frequency T cell clones.
- The method enables precise measurement of T cell clone frequencies in biological samples.