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Applying an Inducible Expression System to Study Interference of Bacterial Virulence Factors with Intracellular Signaling
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Published on: June 25, 2015

B-cell-specific elements enhance sustained gene expression mediated by self-replicating extrachromosomal vectors.

Dominique Zehnpfennig1, Helmut Deissler, Axel Polack

  • 1Department of Child and Adolescent Psychiatry/Psychotherapy, University of Ulm Medical School, 89075 Ulm, Germany.

Molecular Medicine Reports
|April 8, 2011
PubMed
Summary

Non-viral vectors offer a safer alternative for gene therapy, improving transgene expression in B-lymphoid cells. Incorporating Epstein-Barr virus elements and immunoglobulin enhancers significantly boosts gene transfer efficiency and duration.

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Published on: October 31, 2025

Area of Science:

  • Gene Therapy
  • Molecular Biology
  • Virology

Background:

  • Retroviral vectors, once favored for hematopoietic gene transfer, present safety concerns due to random DNA integration.
  • Non-viral vectors are being explored as safer alternatives with potentially larger packaging capacities.
  • Epstein-Barr virus (EBV)-derived elements can facilitate prolonged transgene expression via episomal replication.

Purpose of the Study:

  • To evaluate the efficacy of EBV-derived non-viral vectors for gene transfer in B-lymphoid cells.
  • To investigate the impact of specific cis-acting elements on transgene expression efficiency and duration.
  • To identify optimal modules for enhancing non-viral vector performance in B-lymphoid lineage.

Main Methods:

  • Constructed EBV-derived vectors containing EBNA-1 and oriP for episomal maintenance.
  • Incorporated immunoglobulin κ light chain enhancer elements (Ei and E3') and matrix attachment region (MAR).
  • Assessed transgene expression levels and duration in B-lymphoid cells.

Main Results:

  • Prolonged transgene expression was achieved using EBV-derived vectors with EBNA-1 and oriP.
  • The inclusion of immunoglobulin enhancers (Ei and E3') and MAR resulted in a 10-fold increase in transgene expression.
  • Demonstrated significant enhancement of gene transfer efficiency in B-lymphoid cells.

Conclusions:

  • EBV-derived vectors with EBNA-1 and oriP enable sustained transgene expression in B-lymphoid cells.
  • Immunoglobulin κ light chain enhancer elements and MAR are effective modules for boosting non-viral vector efficiency.
  • These elements represent generally useful tools for improving non-viral gene transfer in the B-lymphoid lineage.