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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1988 Aug;85(16):6097–6101. doi: 10.1073/pnas.85.16.6097

Sequence and organization of the diversity, joining, and constant region genes of the human T-cell delta-chain locus.

Y Takihara 1, D Tkachuk 1, E Michalopoulos 1, E Champagne 1, J Reimann 1, M Minden 1, T W Mak 1
PMCID: PMC281912  PMID: 3413078

Abstract

In this paper we describe the genomic organization and sequence of the human T-cell receptor delta-chain diversity, joining, and constant genes. There is one delta-chain constant region gene (C delta) located approximately equal to 85 kilobases (kb) upstream of the alpha-chain constant region. The delta-chain constant region consists of four exons, whose organization is very similar to that of the C alpha exons, suggesting that C alpha and C delta may have arisen from a gene duplication event. The first exon encodes most of the extracellular constant domain, the second encodes a hinge-like region, and the third encodes the entire transmembrane segment and intracytoplasmic portion, whereas the last exon contains exclusively 3' untranslated sequences. Three joining segments, J delta 1, J delta 2, and J delta 3, are found approximately equal to 12, approximately equal to 5.7, and approximately equal to 3.4 kb upstream of the first exon of C delta. Two functional diversity gene segments, D delta 1 and D delta 2, which can be productively translated in all three reading frames, are found 1 and 9.6 kb upstream of J delta 1. The presence of two D delta with such potential for diversity may offset the limited repertoire of the J delta and V delta genes. The spacer distribution in the recombinational signals flanking D delta and J delta segments allows recombination with V alpha gene segments; however, examination of delta-chain messages does not indicate that this is the case, suggesting that the delta chain uses unique variable gene segments and raising the question as to the reasons for this phenomenon.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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