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Detection of Alternative Splicing During Epithelial-Mesenchymal Transition
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A novel CDX2 isoform regulates alternative splicing.

Matthew E Witek1, Adam E Snook2, Jieru E Lin2

  • 1Department of Radiation Oncology, Kimmel Cancer Center & Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America.

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Summary

The intestine-specific transcription factor CDX2 gene has dual functions. It regulates gene expression via transcription (CDX2) and pre-mRNA processing (CDX2/AS), impacting intestinal cell development.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Gene expression involves coordinated transcription and pre-mRNA processing.
  • Tissue-specific factors like CDX2 regulate intestinal cell development.
  • Alternative splicing increases proteome complexity and functional diversity.

Purpose of the Study:

  • To investigate the functions of the intestine-specific transcription factor CDX2.
  • To identify and characterize alternatively spliced variants of CDX2 mRNA.
  • To elucidate the role of CDX2 variants in gene regulation and pre-mRNA processing.

Main Methods:

  • Sequence analysis of CDX2 mRNA from colonic mucosa.
  • Analysis of protein expression patterns and subcellular localization of CDX2 and CDX2/AS.
  • Functional assays using reporter gene constructs and minigenes in colon cancer cells.

Main Results:

  • An alternatively spliced CDX2 transcript (CDX2/AS) was identified, encoding a protein with a truncated homeodomain and an RS domain.
  • CDX2 and CDX2/AS showed distinct nuclear localization patterns.
  • CDX2/AS altered splicing patterns of target genes independently of CDX2 and co-localized with splicing factors.

Conclusions:

  • The CDX2 gene exhibits dual regulatory functions: transcriptional (CDX2) and pre-mRNA processing (CDX2/AS).
  • CDX2/AS acts as a regulator of alternative splicing, influencing gene expression post-transcriptionally.
  • These findings reveal a novel mechanism of gene regulation in intestinal cells.