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Identical V beta T-cell receptor genes used in alloreactive cytotoxic and antigen plus I-A specific helper T cells.

T lymphocytes involved in the cellular immune response carry cell-surface receptors responsible for antigen and self recognition. This T-cell receptor molecule is a heterodimeric protein consisting of disulphide-linked alpha- and beta-chains with variable (V) and constant (C) regions. Several complementary DNA and genomic DNA clones have been isolated and characterized. These analyses showed that the genomic arrangement and rearrangement of T-cell receptor genes using VT, diversity (DT), joining (JT) and CT gene segments is very similar to the structure of the known immunoglobulin genes. We have isolated two cDNA clones from an allospecific cytotoxic T cell, one of which shows a productive V beta-J beta-C beta 1 rearrangement without an intervening D beta segment. This V beta gene segment is identical to the V beta gene expressed in a helper T-cell clone specific for chicken red blood cells and H-21. The other clone carries the C beta 2 gene of the T-cell receptor, but the C beta 2 sequence is preceded by a DNA sequence that does not show any similarity to V beta or J beta sequences.[1]

References

  1. Identical V beta T-cell receptor genes used in alloreactive cytotoxic and antigen plus I-A specific helper T cells. Rupp, F., Acha-Orbea, H., Hengartner, H., Zinkernagel, R., Joho, R. Nature (1985) [Pubmed]
 
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