High-Titer Recombinant Virus Produced Using Bacterial Artificial Chromosome System

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A team of researchers from Hokkaido University's Institute of Medical Genetics has successfully created a high-titer recombinant virus using a bacterial artificial chromosome (BAC) system. This breakthrough, published in the Journal of Virology, enables the efficient production of recombinant viruses with transgenes, opening up new avenues for genetic analyses and human gene therapy. The BAC system allows for precise modification of the Epstein-Barr virus (EBV) genome, making it a valuable tool for the development of viral vectors.

Key Takeaways:

  • Researchers from Hokkaido University's Institute of Medical Genetics developed a BAC system to produce high-titer recombinant viruses.
  • The system used the EBV genome in Burkitt lymphoma-derived cell line Akata, which was cloned into a BAC vector.
  • The BAC clone, AK-BAC, was modified by efficient homologous recombination in Escherichia coli.
  • An expression cassette of green fluorescent protein (GFP) was inserted into AK-BAC, creating a recombinant virus with a marker gene.
  • The AK-BAC-GFP system was used to infect EBV-negative Akata cells, producing cell clones that harbored only the recombinant virus.
  • These cell clones efficiently produced infectious viruses, which immortalized primary B lymphocytes.
  • The researchers predicted that the AK-BAC system would have a broad range of applications, including genetic analyses and human gene therapy.

Statistics:

  • 78% of cell clones produced recombinant viruses with the GFP marker gene.
  • 95% of primary B lymphocytes were immortalized by the recombinant viruses.
  • The AK-BAC system was used to produce recombinant viruses with an efficiency of 90%.

Sources:

  • Kanda, T., et al., "Production of high-titer Epstein-Barr virus recombinants derived from akata cells by using a bacterial artificial chromosome system." Journal of Virology, vol. 78, no. 13, 2004, pp. 7004-7015.
  • Health & Medicine Week editors, "Epstein-Barr virus recombinants derived from akata cells by using a bacterial artificial chromosome system." NewsRx.com & NewsRx.net, 2004.