Abstract
The Pax-8 gene, a member of the murine family of paired box-containing genes (Pax genes), is expressed in adult thyroid and in cultured thyroid cell lines. The Pax-8 protein binds, through its paired domain, to the promoters of thyroglobulin and thyroperoxidase, genes that are exclusively expressed in the thyroid. In both promoters, the binding site of Pax-8 overlaps with that of TTF-1, a homeodomain-containing protein involved in the activation of thyroid-specific transcription. Pax-8 activates transcription from cotransfected thyroperoxidase and thyroglobulin promoters, indicating that it may be involved in the establishment, control, or maintenance of the thyroid-differentiated phenotype. Thus, the promoters of thyroglobulin and thyroperoxidase represent the first identified natural targets for transcriptional activation by a paired domain-containing protein.
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