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Tissue-specific enhancer of the human glycoprotein hormone alpha-subunit gene: dependence on cyclic AMP-inducible elements.
Delegeane, A M; Ferland, L H; Mellon, P L.
Affiliation
  • Delegeane AM; Regulatory Biology Laboratory, Salk Institute, La Jolla, California 92037.
Mol Cell Biol ; 7(11): 3994-4002, 1987 Nov.
Article in En | MEDLINE | ID: mdl-2828923
We identified and characterized elements which confer tissue specificity and cyclic AMP (cAMP) responsiveness to the human glycoprotein alpha-subunit gene. An enhancer containing an 18-base-pair repeat conferred cAMP responsiveness in a non-tissue-specific fashion. DNase I protection assays revealed DNA-binding factors that bound to this element in both placental and nonplacental cells. It also enhanced the alpha-subunit promoter in a tissue-specific manner but had a negligible effect on a heterologous promoter. A unique element found upstream of this enhancer had no independent activity but, in combination with the cAMP-responsive enhancer, distinctly increased the tissue-specific activity of both the alpha-subunit promoter and a heterologous promoter. A factor that bound to this upstream element was found in placental but not nonplacental cells. We conclude that this novel element acts, perhaps through a specific trans-acting factor, in concert with a cAMP-responsive enhancer to confer tissue specificity to the alpha-subunit gene.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Glycoproteins / Enhancer Elements, Genetic / Promoter Regions, Genetic / Cyclic AMP / Genes / Hormones Type of study: Prognostic_studies Limits: Animals / Humans Language: En Journal: Mol Cell Biol Year: 1987 Document type: Article Country of publication: Estados Unidos

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Glycoproteins / Enhancer Elements, Genetic / Promoter Regions, Genetic / Cyclic AMP / Genes / Hormones Type of study: Prognostic_studies Limits: Animals / Humans Language: En Journal: Mol Cell Biol Year: 1987 Document type: Article Country of publication: Estados Unidos