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Related Experiment Videos

Expression of CD44 variant transcripts in dog lymphatic tissue

K F Milde1, R Alejandro, R L Pastori

  • 1Diabetes Research Institute, University of Miami School of Medicine, FL 33101.

Immunogenetics
|January 1, 1994
PubMed
Summary

Researchers explored CD44 variant exon expression in dogs, finding extensive isoform diversity. This complex splicing pattern, involving all ten variant exons, was also observed in rat and human lymphocytes, highlighting conserved mechanisms in CD44 transcript diversity.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Immunology

Background:

  • The CD44 gene encodes a cell surface glycoprotein.
  • Alternative RNA splicing of ten variant exons (v1-v10) between exons 5 and 16 generates protein diversity.
  • Understanding CD44 splicing is crucial for its role in various biological processes.

Purpose of the Study:

  • To clone and characterize the dog CD44 variant exon cDNA.
  • To investigate the transcript expression patterns of dog CD44 variant exons in normal lymphatic tissues.
  • To compare canine CD44 splicing with human and rat expression profiles.

Main Methods:

  • Cloning of dog CD44 variant exon cDNA.
  • Polymerase Chain Reaction (PCR) using specific primers.
  • Analysis of transcript expression in canine lymphatic tissues and peripheral blood lymphocytes from rat and human.

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Main Results:

  • All ten dog CD44 variant exons (v1-v10) were detected.
  • A high number of diverse CD44 isoforms were identified, with extensive usage of variant exons in various combinations.
  • Some CD44 transcript isoforms exhibited tissue-specific expression patterns.
  • Similar complex splicing patterns were observed in peripheral blood lymphocytes of rats and humans.

Conclusions:

  • Dog CD44 exhibits extensive alternative splicing of its variant exons, generating significant molecular diversity.
  • The complex expression profile of CD44 variant exons is conserved across species, including dogs, rats, and humans.
  • This highlights the conserved regulatory mechanisms governing CD44 functional diversity.