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Updated: Aug 3, 2026
Methods to Discover Alternative Promoter Usage and Transcriptional Regulation of Murine Bcrp1
Published on: May 27, 2016
A characterization of the elements comprising the promoter of the mouse ribosomal protein gene RPS16
1Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, PA 19111.
Abstract:
The elements comprising the mouse rpS16 promoter were characterized by transfection experiments with mutant genes in which various portions of the 5' flanking region and exon I were removed or substituted with extraneous DNA sequence. These experiments were carried out with otherwise intact rpS16 genes transfected into monkey kidney (COS) cells and also with chimeric rpS16-CAT gene constructs transfected into mouse plasmacytoma cells and COS cells. The locations of the functionally important elements were generally correlated with the locations of binding sites for specific nuclear factors, which were identified by gel-mobility shift analyses and methylation interference footprints. The most upstream element, which is located approximately 165 bp from the cap site, binds the Sp1 transcription factor and augments the promoter activity by 2 to 2.5-fold. In addition, there is a complex bipartite element in the -83 to -59 region, an element in the -37 to -12 region and an element in the +9 to +29 region of exon I, all of which are essential for rpS16 expression. The rpS16 promoter has a general architecture that resembles other mouse rp promoters; however, it also possesses some distinctive characteristics.
Insights
Researchers identified key regulatory elements in the mouse ribosomal protein S16 (rpS16) promoter. These elements, including Sp1 transcription factor binding sites, are crucial for rpS16 gene expression.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- The ribosomal protein S16 (rpS16) gene is essential for protein synthesis.
- Understanding the regulatory mechanisms of rpS16 gene expression is vital for cellular function.
Purpose of the Study:
- To characterize the functional elements of the mouse rpS16 promoter.
- To identify specific DNA-protein interactions involved in rpS16 gene regulation.
Main Methods:
- Transfection experiments using mutant rpS16 and chimeric rpS16-CAT constructs in COS and mouse plasmacytoma cells.
- Gel-mobility shift assays and methylation interference footprinting to identify nuclear factor binding sites.
Main Results:
- Identified functionally important elements within the rpS16 promoter, including a region binding the Sp1 transcription factor (-165 bp).
- Discovered essential elements in the -83 to -59, -37 to -12, and +9 to +29 (exon I) regions.
- Correlated functional elements with specific nuclear factor binding sites.
Conclusions:
- The mouse rpS16 promoter contains multiple essential regulatory elements, including an upstream Sp1 binding site that enhances promoter activity.
- The identified elements and their interactions provide insights into the distinct architecture of the rpS16 promoter compared to other ribosomal protein promoters.
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