Abstract
The tissue-specific extinguisher locus TSE1, a dominant negative regulator of transcription in somatic cell hybrids, acts via a cAMP response element (CRE) to repress activity of a hepatocyte-specific enhancer. Guided by the antagonism between TSE1 and cAMP-mediated signal transduction, we identified the regulatory subunit Rlα of protein kinase A (PKA) as the product of the TSE1 locus. The evidence derives from concordant expression of Tlα mRNA and TSE1 genetic activity, high resolution mapping of the RIα gene and TSE1 on human chromosome 17, and the ability of a transfected RIα cDNA to generate a phenocopy of TSE1-mediated extinction. The mechanism of TSE1/RIα-mediated extinction involves repression of basal PKA activity, reduced phosphorylation of CREB at Ser-133, and a corresponding reduction of in vivo protein binding at the target CRE.
Item Type: | Journal article |
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Faculties: | Biology |
Subjects: | 500 Science > 570 Life sciences; biology |
URN: | urn:nbn:de:bvb:19-epub-3205-5 |
Item ID: | 3205 |
Date Deposited: | 09. Apr 2008, 14:02 |
Last Modified: | 04. Nov 2020, 12:46 |