The far-upstream enhancer of the carbamoyl-phosphate synthetase I gene is responsible for the tissue specificity and hormone inducibility of its expression
| Autor: | A. F. M. Moorman, M. J. van den Hoff, Vincent M. Christoffels, Wouter H. Lamers |
|---|---|
| Přispěvatelé: | Other departments |
| Jazyk: | angličtina |
| Rok vydání: | 1995 |
| Předmět: |
TATA box
Molecular Sequence Data CAAT box Carbamoyl-Phosphate Synthase (Ammonia) Gene Expression Biochemistry Carbamoyl phosphate synthetase I Cell Line Transcription (biology) Gene expression Animals Rats Wistar Enhancer Promoter Regions Genetic Molecular Biology Gene biology Base Sequence Cell Biology Molecular biology TATA Box Upstream Enhancer Hormones Rats Enhancer Elements Genetic Organ Specificity biology.protein |
| Zdroj: | Journal of biological chemistry, 270(42), 24932-24940. American Society for Biochemistry and Molecular Biology Inc. |
| ISSN: | 0021-9258 |
| Popis: | The role of the proximal promoter and the far-upstream enhancer in the hepatocyte-specific and hormonal regulation of the carbamoyl-phosphate synthetase I (CPS) gene was investigated in transient transfection assays using primary rat hepatocytes, hepatoma cells, and fibroblasts. These experiments revealed that the activity of the promoter is comparable in all cells tested and is, therefore, not responsible for tissue-specific expression. The 5′-untranslated region of the mRNA is a major, non-tissue specific stimulator of expression in FTO-2B hepatoma cells, acting at the post-transcriptional level. A 469-base pair DNA fragment, 6 kilobase pairs upstream of the transcription start-site in the CPS gene, confers strong hormone-dependent tissue specific expression, both in combination with the CPS promoter and a minimized viral thymidine kinase promoter. Sequences similar to a cyclic AMP-responsive element and a glucocorticosteroid-responsive element were found in the isolated enhancer. Substitutional mutations in these sites strongly affected hormone-induced expression. Analysis of the interaction between the enhancer and parts of the CPS promoter revealed that, in addition to the TATA box, the GAG box, a motif similar to the GC box near the TATA motif, is instrumental in conferring the enhancer activity. |
| Databáze: | OpenAIRE |
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