Transcriptional regulation of the T cell antigen receptor zeta subunit: identification of a tissue-restricted promoter

doi:10.1084/jem.180.4.1529

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Transcriptional regulation of the T cell antigen receptor zeta subunit: identification of a tissue-restricted promoter

BL Rellahan, JP Jensen and AM Weissman
Laboratory of Immune Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.

The cell surface expression of T cell antigen receptors (TCR) is regulated in part by the limiting synthesis of the zeta subunit. Utilizing fragments from the 5' region of the human zeta gene, two discrete regions that promote transcription were characterized. Both of these elements are located within 125 bases of the most 3' site of transcription initiation. The more proximal (3') promoter exhibits activity in lymphoid as well as nonlymphoid cells. In contrast, the more distal (5') promoter element functions in a tissue-restricted fashion. The tissue-specific promoter is localized to a 29-base fragment. The sequence of this region is remarkable for a stretch of 11 consecutive purines that are required for activity. This element constitutes the only known tissue-specific promoter for an invariant TCR subunit. Consistent with the unique role served by the zeta subunit in assembly of the TCR, this study demonstrates that the expression of the zeta gene is regulated in a fashion distinct from other TCR components.
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