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Science 9 August 1985:
Vol. 229. no. 4713, pp. 566 - 570
DOI: 10.1126/science.3875151
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Articles

Science, Vol 229, Issue 4713, 566-570
Copyright © 1985 by American Association for the Advancement of Science

articles

T-cell receptor beta-chain expression: dependence on relatively few variable region genes

MA Behlke, DG Spinella, HS Chou, W Sha, DL Hartl, and DY Loh

Fifteen independently isolated complementary DNA clones that contain T-cell receptor (TCR) V beta genes were sequenced and found to represent 11 different V beta genes. When compared with known sequences, 14 different V beta genes could be defined from a total of 25 complementary DNA's; 11 clones therefore involved repeated usage of previously identified V beta's. Based on these data, we calculate a maximum likelihood estimate of the number of expressed germline V beta genes to be 18 with an upper 95 percent confidence bound of 30 genes. Southern blot analysis has shown that most of these genes belong to single element subfamilies which show very limited interstrain polymorphism. The TCR beta-chain diversity appears to be generated from a limited V beta gene pool primarily by extensive variability at the variable-diversity-joining (V-D-J) junctional site, with no evidence for the involvement of somatic hypermutation.


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