Abstract

Epstein-Barr virus (EBV) replicons which include the genetic element oriP and a functional gene for Epstein-Barr nuclear antigen (EBNA-1) can be maintained episomally in a variety of mammalian cell lines [Yates et al., Nature 313 (1985) 812–815]. We have assessed the application of an EBV replicon for foreign gene expression. Two cDNAs, human interferon-γ (IFN-γ) and the extracellular domain of the human epidermal growth factor receptor (EGF-R ex), cloned in an EBV replicon, were efficiently expressed and the protein was secreted into the extracellular media. Expression in human embryonic 293 cells was approximately ten-fold higher than in CV-1 cells. The expression of the human protein is dependent upon the orientation of the IFN-γ transcriptional cassette relative to the other genetic elements within the vector.

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