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. 1987 May 22;49(4):477-85.
doi: 10.1016/0092-8674(87)90450-8.

T cell receptor beta gene sequences in the circular DNA of thymocyte nuclei: direct evidence for intramolecular DNA deletion in V-D-J joining

K Okazaki, D D Davis, H Sakano

T cell receptor beta gene sequences in the circular DNA of thymocyte nuclei: direct evidence for intramolecular DNA deletion in V-D-J joining

K Okazaki et al. Cell. .

Abstract

We have identified circular DNA containing T cell receptor (TCR) beta gene sequences in mouse thymocytes, thereby providing direct evidence for the intramolecular DNA deletion model of V-D-J joining in TCR beta genes. Two types of excision products of V-D-J joining have been identified. Type I, a circular reciprocal recombinant of normal V-D or D-J joining, contains a 7mer-7mer head-to-head structure expected from an excised product of normal V-D or D-J joining. Type II contains a D beta 2-J beta 1 structure on the circular DNA; the recombination event producing this molecule occurs between an upstream J and a downstream D segment, probably leaving the reciprocal 7mer-7mer structure on the chromosome. Some type I molecules seem to represent excision products of secondary joining after formation of the first D-J or V-D-J structure. The recombination mechanism that generates the circular DNA is discussed.

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