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pubmed-article:10075018pubmed:abstractTextT cells are essential in the initiation and maintenance of immune responses. Specific interaction between T cells and a presumptive antigen occurs through recognition of an MHC-peptide complex by the T-cell receptor (TCR). The complementarity-determining region (CDR) 3 of the TCR has direct contact with the peptide. Here we describe CDR3 length variability of six different TCRBV gene families of CD4+ and CD8+ umbilical cord (UC) and peripheral blood (PB) T cells. Amplified products spanning the TCR CDR3 regions from CD4+ PB, CD4+ UC and CD8+ UC blood T cells typically displayed Gaussian-like distributions. In contrast, profound and frequent perturbations were recorded in CD8+ PB lymphocytes, with a non-Gaussian pattern in more than half of the samples studied. A substantial portion of the perturbed CD8+ subsets were clonal or oligoclonal, as determined by CDR3-length restriction, TCRBJ gene usage and nucleotide sequencing. This implies that the conditions for shaping and maintenance of the peripheral TCR repertoire are profoundly different for CD8+ and CD4+ T cells.lld:pubmed
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pubmed-article:10075018pubmed:pagination149-54lld:pubmed
pubmed-article:10075018pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:10075018pubmed:year1999lld:pubmed
pubmed-article:10075018pubmed:articleTitleDiverse T-cell receptor CDR3 length patterns in human CD4+ and CD8+ T lymphocytes from newborns and adults.lld:pubmed
pubmed-article:10075018pubmed:affiliationMicrobiology and Tumorbiology Center, Karolinska Institute, Stockholm, Sweden.lld:pubmed
pubmed-article:10075018pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10075018pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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