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Published on: April 27, 2017
Structural and functional characterization of the mouse tescalcin promoter
Erasmo M Perera1, Yong Bao, Lidia Kos
1Department of Pediatrics, Endocrinology Division, University of Miami, Leonard Miller School of Medicine, Miami, FL 33136, USA. eperera@med.miami.edu
Gene
|June 15, 2010
Summary
Researchers identified new tescalcin mRNA variants and characterized the Tesc promoter, revealing that Sp1 and Sp3 transcription factors cooperate to activate Tesc gene expression, with a specific ZF5 motif being crucial.
Area of Science:
- Molecular Biology
- Gene Regulation
Background:
- Tescalcin (Tesc) is an EF-hand calcium-binding protein regulating the Na(+)/H(+) exchanger 1 (NHE1).
- Its expression is high in mouse heart and brain, but regulatory mechanisms are unknown.
Purpose of the Study:
- To identify novel tescalcin mRNA variants.
- To characterize the regulatory elements of the mouse Tesc gene promoter.
- To elucidate the transcription factors involved in Tesc gene expression.
Main Methods:
- Identification of Tesc mRNA variants through alternative splicing analysis.
- Primer extension and sequence analysis to locate the transcription start site and promoter region.
- Reporter gene assays (transient transfection) with deleted promoter constructs.
- Electrophoresis mobility shift assays (EMSAs) and supershift assays to identify DNA-binding proteins.
- Site-directed mutagenesis to assess the role of specific motifs.
- Inhibition studies using Mithramycin A.
- Co-expression studies in Drosophila D.mel-2 cells.
Main Results:
- Two novel Tesc mRNA variants (V2 and V3) were identified, resulting from alternative splicing.
- The transcription start site was mapped, and the promoter region contains a CpG island, TATA box, and putative transcription factor binding sites.
- The minimal promoter region was identified between nucleotides -130 and -40.
- Sp1 and Sp3 transcription factors were shown to bind to GC-rich motifs within the Tesc promoter.
- Sp1 and Sp3 exhibited synergistic transactivation of the Tesc promoter.
- A putative ZF5 motif within the minimal promoter was found to be critical for Tesc promoter activity.
Conclusions:
- The study identified new Tesc mRNA variants and characterized the Tesc promoter region.
- Sp1 and Sp3 transcription factors cooperate synergistically to activate Tesc gene expression.
- A specific ZF5 motif is essential for the activation of the Tesc promoter, highlighting its importance in regulating Tesc expression.
