Expression vector for establishing highly productive cell and the highly productive cell

摘要

The present invention provides an expression vector which is effective in an efficient establishment of transformed cells which express the aimed protein gene in a high level. An expression vector which has a cassette for expressing the drug selective marker gene containing mRNA destabilizing sequence, at least one element for stabilizing the gene expression and a cassette for expressing the gene of the aimed protein. Preferably, the mRNA destabilizing sequence is derived from AT-rich sequence existing in the 3'-untranslated region of cytokine, interleukin or proto-oncogene, and the element for stabilizing the gene expression is derived from Chinese hamster genome.