Abstract
We have analyzed by reverse transcriptase-polymerase chain reaction (RT-PCR) the individual non-germ line configurations of the T cell receptor (TCR) Vβ chains expressed by T cells from eight individual cord blood specimens. cDNA from each cord blood was amplified using a common primer coupled with a primer specific for each of 22 variable elements of the Vβ chain family and the amplified fragments were separated under high resolution conditions. With cDNA from adult blood (as a control), all of the TCR chains were amplified as a smear consistent with the extensive polyclonality of adult T cells. In contrast, a heterogeneous pattern of amplification was observed with cDNAs from cord blood: only 26.7 ± 21.9% of the 22 Vβ chains analyzed were amplified as a smear. The majority of them were amplified as a discrete number of bands (up to 10) (in 68.2 ± 18.7% of samples) and some of them as a single fragment (4.0 ± 7.8%). Only one of the eight samples analyzed expressed the majority (72.7%) of its Vβ chains as a smear, consistent with an adult-like TCR repertoire. In conclusion, cord blood expressed, on average, a less complex TCR repertoire than adult blood. Bone Marrow Transplantation (2000) 26, 83–89.
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Acknowledgements
This study was supported by institutional funds from Istituto Superiore di Sanità, Rome, Italy, and by contract No. BIO4-CT96–0646 of the European Community. Dr E Mannella, director of the Italian Red Cross in Rome, and Dr H Valenzise, Department of Obstetrician and Gynecology, University of Tor Vergata, Rome, are gratefully acknowledged for providing adult peripheral blood and fetal blood, respectively. Prof G D'Agnolo, chairman of the Laboratory of Cell Biology, is gratefully acknowledged for the continuous support of the study.
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Alfani, E., Migliaccio, A., Sanchez, M. et al. Characterization of the T cell receptor repertoire of neonatal T cells by RT-PCR and single strand conformation polymorphism analysis. Bone Marrow Transplant 26, 83–89 (2000). https://doi.org/10.1038/sj.bmt.1702434
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DOI: https://doi.org/10.1038/sj.bmt.1702434
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