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Related Experiment Videos

A role for RNA processing in regulating expression from transfected genes.

M W McBurney1, X Yang, K Jardine

  • 1Ottawa Regional Cancer Center, University of Ottawa, Canada. michael_mcburney@cancercare.on.ca

Somatic Cell and Molecular Genetics
|July 20, 1999
PubMed
Summary
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Integrating genes into stem cells often leads to silencing. Co-transfecting with mouse Pgk-1 gene fragments enhances reporter gene expression by influencing chromatin structure, preventing gene inactivation.

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Stem Cell Biology

Background:

  • Stable integration of cloned genes into pluripotent stem cell genomes often results in tandem arrays.
  • Gene expression from these tandem arrays is frequently inefficient due to repeat-induced gene silencing.

Purpose of the Study:

  • To investigate methods for enhancing cloned gene expression in stem cells.
  • To elucidate the mechanism by which co-transfected murine Pgk-1 gene fragments improve gene expression.

Main Methods:

  • Stable gene integration into embryonal carcinoma stem cells.
  • Co-transfection with cloned fragments of the murine Pgk-1 gene.
  • Analysis of reporter gene expression and chromatin structure.

Main Results:

Related Experiment Videos

  • Reporter gene expression was significantly enhanced when co-transfected with Pgk-1 fragments.
  • Enhanced expression required an active Pgk-1 promoter driving transcription through a large region (>12 kbp) containing introns and exons.
  • The effect mimicked that of histone deacetylase inhibitors, suggesting a role in chromatin structure modification.

Conclusions:

  • Co-transfection with specific Pgk-1 gene fragments can overcome gene silencing in stem cells.
  • The mechanism involves influencing local chromatin structure, potentially acting as an insulator or boundary element.
  • This finding offers a strategy to improve the efficacy of gene delivery in stem cell applications.