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A DNA binding protein in human thymocytes recognizes the T cell receptor-delta-deleting element psi J alpha.

M C Verschuren, C J van Bergen, E J van Gastel-Mol, A J Bogers and J J van Dongen
J Immunol May 15, 1996, 156 (10) 3806-3814;
M C Verschuren
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C J van Bergen
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E J van Gastel-Mol
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A J Bogers
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J J van Dongen
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Abstract

The TCR is a heterodimeric molecule composed of either gamma delta or alpha beta chains. The differentiation mechanisms that force thymocytes into the gamma delta alpha beta lineage are poorly understood, but rearrangement processes in the TCR-delta alpha locus are likely to play an important role. The TCR-delta gene complex is flanked by the delta-deleting elements delta Rec and psi J alpha, which are assumed to delete the TCR-delta gene before V alpha-J alpha rearrangement. The nonproductive delta Rec-psi J alpha recombination occurs at high frequency in both fetal and postnatal immature thymocytes. To find DNA binding proteins involved in the delta Rec-psi J alpha preferential rearrangement, we performed electrophoretic mobility shift assays using the recombination signal sequence of psi J alpha with additional upstream and downstream sequences. We observed a 180-kDa DNA binding protein in nuclear extracts from human thymocytes that recognized a 46-bp binding site on the psi J alpha gene segment, containing the core motif GTTAATAGG. The psi J alpha binding protein, which we call PJA-BP, was also detected in immature CD3-T cell lines with TCR-delta genes deleted on both alleles, in a TCR-alpha beta+ cell line, and in two of four myeloid cell lines. This protein was absent in a TCR-gamma delta+ T cell line, in nonhemopoietic cell lines, and in all but one B cell lines tested. Although we could detect binding activity of the PJA-BP to some other TCR-J alpha gene segments, we postulate that binding of PJA-BP to the psi J alpha gene segment is one of the factors involved in the preferential delta Rec-psi J alpha gene rearrangement process.

  • Copyright © 1996 by American Association of Immunologists

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The Journal of Immunology
Vol. 156, Issue 10
15 May 1996
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A DNA binding protein in human thymocytes recognizes the T cell receptor-delta-deleting element psi J alpha.
M C Verschuren, C J van Bergen, E J van Gastel-Mol, A J Bogers, J J van Dongen
The Journal of Immunology May 15, 1996, 156 (10) 3806-3814;

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A DNA binding protein in human thymocytes recognizes the T cell receptor-delta-deleting element psi J alpha.
M C Verschuren, C J van Bergen, E J van Gastel-Mol, A J Bogers, J J van Dongen
The Journal of Immunology May 15, 1996, 156 (10) 3806-3814;
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Print ISSN 0022-1767        Online ISSN 1550-6606