Construction and properties of an Epstein-Barr-virus-derived cDNA expression vector for human cells.

Gene
P B BeltClaude Backendorf

Abstract

A cDNA expression vector containing the element oriP and the sequence encoding the Epstein-Barr virus (EBV) nuclear antigen 1 (EBNA-1) as well as the hygromycin B-resistance dominant marker gene has been constructed. Its characteristics have been compared to a similar vector lacking the EBV sequences. (a) The EBV+ vector is maintained as an episome with a copy number of approx. 50 per cell, whereas the number of the integrated EBV- copies is in general smaller than 10, when simian virus 40-transformed xeroderma pigmentosum fibroblasts (XP20S-SV) constitute the recipient cell line. (b) The presence of the EBV sequences in the vector resulted in a five- to ten-fold higher transfection efficiency with the Ca.phosphate precipitation technique. (c) cDNA inserts in the EBV+ vector are shown to be efficiently and properly expressed in the recipient cell. (d) If transfection is performed with a mixture of EBV+ vectors with different inserts, transfectants are shown to harbour different plasmids within one cell. (e) The ratio between these plasmids in one cell can be shifted in favour of a vector with a particular insert, when selection for this insert is performed. (f) Reconstruction experiments indicated that isolation of a low-abunda...Continue Reading

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