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Tissue specific trans-acting factor interaction with proximal rat prolactin gene promoter sequences
W A Schuster1, M N Treacy, F Martin
1Department of Pharmacology, University College Dublin, Ireland.
The EMBO Journal
|June 1, 1988
Summary
Researchers identified specific DNA regions in rat prolactin (rPrl) promoter that bind to nuclear factors in GH3 cells. These proximal promoter sequences are crucial for prolactin gene expression.
Area of Science:
- Molecular Biology
- Genetics
- Endocrinology
Background:
- The regulation of prolactin (PRL) gene expression is critical for various physiological processes.
- Understanding the specific DNA sequences and nuclear factors involved in PRL gene regulation is essential.
Purpose of the Study:
- To identify and characterize nuclear factors that bind to the rat prolactin (rPrl) promoter.
- To determine the functional significance of these binding interactions in GH3 cells.
Main Methods:
- Exonuclease III protection assay to detect DNA-protein interactions.
- Transient cotransfection competition studies using chloramphenicol acetyl transferase (CAT) reporter gene.
Main Results:
- Strong, reversible, and tissue-specific binding of nuclear factors to the proximal rPrl promoter (-31 to -77) in GH3 cells was detected.
- A secondary binding region was identified (-155 to -180), potentially present in HeLa cells.
- Proximal rPrl promoter sequences (-75 to +38) effectively inhibited rPrl promoter-driven gene expression in competition assays.
Conclusions:
- The proximal rPrl promoter sequences are critically important for prolactin gene expression in GH3 cells.
- Distal rPrl 5'-flanking sequences also show functional potential in regulating prolactin gene expression.