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Transforming functions associated with Epstein-Barr virus.

B Sugden, J Yates, W Mark

    The Journal of Investigative Dermatology
    |July 1, 1984
    PubMed
    Summary
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    Epstein-Barr virus (EBV) transforms human B-lymphocytes, maintaining viral DNA as plasmids. Researchers identified a specific EBV DNA region essential for maintaining these plasmids in transformed cells.

    Area of Science:

    • Virology
    • Molecular Biology
    • Cell Biology

    Background:

    • Epstein-Barr virus (EBV) infects human B-lymphocytes, inducing their transformation into continuously proliferating lymphoblasts.
    • These transformed lymphoblasts harbor multiple, complete copies of EBV DNA as plasmids.
    • Viral functions crucial for EBV-induced transformation and plasmid maintenance remain largely uncharacterized.

    Purpose of the Study:

    • To develop and utilize an assay for identifying viral functions necessary for maintaining EBV plasmids in transformed cells.
    • To pinpoint specific regions of the EBV genome involved in plasmid maintenance.

    Main Methods:

    • A plasmid vector conferring ampicillin resistance (E. coli) and G418 resistance (mammalian cells) was engineered.
    • Molecularly cloned fragments spanning the EBV genome were inserted into this vector.

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  • Recombinant molecules were transfected into four cell types, and G418-resistant survivors were quantified.
  • Main Results:

    • One specific region of the EBV genome significantly increased survival rates (10- to 100-fold) in G418 selection compared to other fragments.
    • This EBV DNA fragment was maintained as an unrearranged plasmid in transfected cells.
    • The identified fragment contains cis-acting elements essential for EBV plasmid replication.

    Conclusions:

    • A novel assay successfully identified a critical EBV DNA region for plasmid maintenance.
    • This region harbors essential cis-acting elements required for EBV plasmid replication in transformed cells.
    • Further characterization of this region will elucidate key viral functions in EBV-induced cell transformation.