Abstract
Transfection of primate tissue explants with a specific sub-fragment (p31) of EBV DNA results in epithelial (but no other) cells proliferating indefinitely (becoming ‘immortalized’) without evidence of a ‘growth crisis’. Molecular evidence supports integration of viral information into the host chromosome, and an early genotypic alteration involving specific amplification of a sub-component (IR1) of p31 DNA, followed by apparent loss of viral DNA from chromosomes, consistent with a ‘hit and run’ mechanism. However, analysis at the individual cell level during long-term culture, by FISH techniques, reveals chromosomal alterations, and viral sequences surviving within double minute (DM) bodies. Changing growth patterns occurring at different stages during propagation (>a year in culture) may be explained by sporadic reintegration of surviving viral DNA into the host chromosome. Notably, throughout culture, telomere lengths in chromosomal DNAs do not alter but rather retain the length observed in the primary cell populations. Introduction of a growth stimulating function of EBV, BARF1, into the immortalized, non-clonable epithelial cells under conditions which permit overexpression, allows clonal populations to be derived. Based on the data, mechanisms of immortalization, in the absence of a proven viral oncogene in p31 DNA, and possible genes involved, are considered.
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Acknowledgements
We thank the Cancer Research Campaign, UK and The Royal College of Surgeons of England for partial support of this work. S-A Xue gratefully acknowledges grant support from the European Community, contract no. IC18CT96-0132, and BE Griffin thanks the Leverhulme Foundation for an award.
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Gao, Y., Lu, YJ., Xue, SA. et al. Hypothesis: a novel route for immortalization of epithelial cells by Epstein-Barr virus. Oncogene 21, 825–835 (2002). https://doi.org/10.1038/sj.onc.1205130
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DOI: https://doi.org/10.1038/sj.onc.1205130
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