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Mol Cell Biol. 1984 February; 4(2): 340-350

High-level expression of a cloned HLA heavy chain gene introduced into mouse cells on a bovine papillomavirus vector.

ABSTRACT

A gene encoding the heavy chain of an HLA human histocompatibility antigen was isolated from a library of human DNA by recombination and selection in vivo. After insertion into a bovine papillomavirus (BPV) DNA expression vector, the gene was introduced into cultured mouse cells. Cells transformed with the HLA-BPV plasmids did not appear to contain extrachromosomal viral DNA, whereas BPV recombinants usually replicated as plasmids in transformed cell lines. Large amounts of HLA RNA were produced by the transformed cells, and the rate of synthesis of human heavy chain was several-fold higher than in the JY cell line, a well-characterized human lymphoblastoid cell line which expresses high levels of surface HLA antigen. Substantial amounts of human heavy chain accumulated in the transformed cells, and HLA antigen was present at the cell surface. These observations establish the feasibility of using BPV vectors to study the structure and function of HLA antigens and the expression of cloned HLA genes.

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