METHOD FOR SELECTING A HIGH EXPRESSION RECOMBINANT CELL LINE

摘要

The present invention relates to a method for selecting a high expression recombinant cell line using an expression vector including: (i) a gene expression cassette containing a selection marker gene to which polyA is inactively connected; and (ii) a gene expression cassette for coding target recombinant proteins to which polyA is actively connected. The method according to the present invention enables the selection of high productivity cell clones from cell populations of 10 times or more less than the cell populations of conventional cell line selection methods. Particularly, the method of the present invention uses low density MTX in selecting high productivity cell clones to shorten the time taken for developing a cell line, as compared to a conventional phased gene amplification strategy which increases the amount of MTX and includes several amplification phases. The method of the present invention achieves an improved efficiency in producing proteins in the event general selection marker genes other than MTX are used.