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RNA Splicing01:32

RNA Splicing

Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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Related Experiment Video

Updated: May 30, 2026

Mucin Agarose Gel Electrophoresis: Western Blotting for High-molecular-weight Glycoproteins
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Published on: June 14, 2016

MUC1/A and MUC1/B splice variants differentially regulate inflammatory cytokine expression.

Yoannis Imbert-Fernandez1, Brandie N Radde, Yun Teng

  • 1Department of Biochemistry & Molecular Biology, Center for Genetics and Molecular Medicine, University of Louisville School of Medicine, Louisville, KY 40292, USA.

Experimental Eye Research
|August 23, 2011
PubMed
Summary

The MUC1/A splice variant is less common in dry eye disease patients. MUC1/A and MUC1/B mucin variants show distinct inflammatory responses, impacting dry eye disease susceptibility.

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Area of Science:

  • Ophthalmology
  • Immunology
  • Molecular Biology

Background:

  • Dry eye disease is linked to chronic inflammation.
  • A lower frequency of the MUC1/A splice variant was observed in dry eye patients.
  • This suggests a potential role for MUC1 variants in disease pathogenesis.

Purpose of the Study:

  • To clone and characterize cells expressing MUC1/A or MUC1/B variants.
  • To investigate the differential modulation of inflammatory responses by MUC1/A and MUC1/B.
  • To explore the role of MUC1 genotypic differences in dry eye disease.

Main Methods:

  • Cloning of MUC1/A and MUC1/B variants into expression vectors.
  • Transient transfection into MUC1-null COS-7 cells.
  • Analysis of inflammatory marker expression (cytokines, NF-κB, miR-21) following TNFα stimulation.

Main Results:

  • MUC1/A and MUC1/B exhibited similar protein expression and localization.
  • MUC1/A and MUC1/B differentially modulated TNFα-induced IL-1β and IL-8 expression over time.
  • MUC1/A increased basal TGFβ expression, while both variants affected NF-κB and miR-21 expression differently.

Conclusions:

  • MUC1/A and MUC1/B possess distinct inflammatory activities.
  • Genotypic variations in MUC1 may influence susceptibility to ocular surface damage in dry eye disease.