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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Related Experiment Video

Updated: Jun 7, 2025

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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
PubMed
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.

Keywords:
Alternative splicingCUGBP2STAT3

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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.