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Updated: Jun 7, 2025
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Merging Absolute and Relative Quantitative PCR Data to Quantify STAT3 Splice Variant Transcripts
Published on: October 9, 2016
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RNA binding protein CUGBP2/ETR-3 regulates STAT3 alternative splicing.
Miki Kise1, So Masaki2, Naoyuki Kataoka3
1Laboratory of Molecular Medicinal Science, Department of Pharmaceutical Sciences, Ritsumeikan University, Shiga, Japan; Graduate School of Pharmacy, Ritsumeikan University, Shiga, Japan.
Biochemical and Biophysical Research Communications
|November 17, 2024
Summary
Signal transducer and activator of transcription 3 (STAT3) splicing produces STAT3α and STAT3β isoforms. The protein CUGBP2 regulates this alternative splicing by binding to intron 22, influencing STAT3 signaling.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Signal transducer and activator of transcription 3 (STAT3) is a key regulator in numerous biological processes.
- Alternative splicing of STAT3 pre-mRNA generates two isoforms, STAT3α and STAT3β, with distinct functional properties.
- The precise mechanisms governing STAT3 alternative splicing and isoform balance remain incompletely understood.
Purpose of the Study:
- To identify cis-regulatory elements involved in STAT3 alternative splicing.
- To discover novel trans-acting factors that modulate STAT3 pre-mRNA splicing.
- To elucidate the role of CUGBP2 in regulating STAT3 isoform expression.
Main Methods:
- Bioinformatic analysis to identify potential cis-regulatory elements.
- Experimental validation of identified elements and trans-acting factors.
- RNA-binding assays to confirm protein-RNA interactions.
Main Results:
- Identification of specific cis-regulatory elements within STAT3 pre-mRNA.
- CUGBP2 (ETR-3) was identified as a novel trans-acting factor regulating STAT3 splicing.
- CUGBP2 binds to UG-rich elements in intron 22 of STAT3 pre-mRNA, modulating alternative splicing.
Conclusions:
- STAT3 alternative splicing is regulated by CUGBP2, offering a new mechanism for controlling STAT3 isoform balance.
- CUGBP2's interaction with intron 22 sequences provides critical insights into STAT3 pre-mRNA processing.
- Targeting CUGBP2 and its binding sites may offer therapeutic strategies for diseases involving STAT3 signaling pathways.
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