The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 173, 503-506, Copyright © 1991 by Rockefeller University Press

ARTICLES

Junctional sequences influence the specificity of gamma/delta T cell receptors

BL Rellahan, JA Bluestone, BA Houlden, MM Cotterman and LA Matis
Division of Cytokine Biology, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland 20892.

T lymphocytes bearing the gamma/delta T cell receptor (TCR-gamma/delta) express a limited number of germline variable gene segments, generating receptor sequence diversity primarily through junctional mechanisms. To examine the role of V(D)J junctional sequences in antigen recognition by TCR-gamma/delta, we derived an alloreactive murine TCR-gamma/delta+ T cell line, LKD1, specific for the I-Ad class II major histocompatibility complex (MHC) molecule, and compared its receptor with that expressed by a previously characterized class II MHC alloreactive T cell line, LBK5, specific for I-Ek,b,s Ia molecules. Both LKD1 and LBK5 express receptors encoded by rearranged V gamma 1.2J gamma 2 and V delta 5D delta 2J delta 1 gene elements, differing in sequence only in the V(D)J junctional regions of the gamma and delta genes. These results demonstrate that junctionally encoded sequences corresponding to the putative third complementarity determining region can influence the antigen specificity of TCR-gamma/delta.
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