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piggyBac Transposon System Modification of Primary Human T Cells
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Effective Targeted Gene Knockdown in Mammalian Cells Using the piggyBac Transposase-based Delivery System.

Jesse B Owens1, Juanita Mathews, Philip Davy

  • 1Department of Anatomy, Biochemistry, and Physiology Institute for Biogenesis Research, University of Hawaii, Honolulu, Hawaii, USA.

Molecular Therapy. Nucleic Acids
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This study demonstrates that the piggyBac delivery system (pmGENIE-3) efficiently knocks down gene expression in human cells. This nonviral gene delivery method successfully reduced telomerase reverse transcriptase (TERT) and telomerase activity, shortening telomeres.

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Area of Science:

  • Molecular Biology
  • Gene Therapy
  • Cancer Research

Background:

  • Nonviral gene delivery systems offer a promising alternative for gene overexpression in various cell types.
  • The piggyBac transposase system has been engineered into a helper-independent, self-inactivating delivery vector (pmGENIE-3) for high-efficiency mammalian cell transfection.
  • Assessing the utility of pmGENIE-3 for gene knockdown applications, specifically targeting short hairpin RNAs (shRNAs).

Purpose of the Study:

  • To evaluate the efficacy of the pmGENIE-3 nonviral delivery system for stable gene knockdown in human cells.
  • To investigate the potential of pmGENIE-3 to drive shRNA expression for targeting telomerase reverse transcriptase (TERT).
  • To assess the impact of TERT knockdown on telomerase activity and telomere length in human cancer cell lines.

Main Methods:

  • Development of two independent pmGENIE-3 vectors designed to target the endogenous TERT gene.
  • Transfection of HEK293 and MCF-7 human cell lines with pmGENIE-3 constructs targeting TERT.
  • Comparison of transfection and integration efficiency with a transposase-deficient control vector.
  • Measurement of TERT expression, telomerase activity, and telomere length post-transfection and selection.

Main Results:

  • pmGENIE-3 demonstrated significantly enhanced short-term transfection (~4-fold) and long-term integration (~5-fold) efficiencies compared to controls.
  • Stable knockdown of TERT expression and activity was achieved in both HEK293 and MCF-7 cells using pmGENIE-3 vectors.
  • Knockdown of TERT led to significant telomere shortening (3-4 Kb, P < 0.001) in stably transfected cell lines.
  • The piggyBac system proved effective for stable gene knockdown in mammalian cells.

Conclusions:

  • The piggyBac-based pmGENIE-3 system is a highly efficient nonviral vector for stable gene knockdown in human cells.
  • Targeting TERT using this system effectively abrogates telomerase function, leading to telomere shortening.
  • This technology holds potential for developing novel tumor-targeting therapies by enabling stable gene silencing.