The invention relates to a method for screening
drug target genes based on a
CRISPR / Cas9 high-
throughput technology. The method comprises the steps of firstly establishing a sgRNA
library; secondly packaging the sgRNA
library by using slow viruses, and collecting the viruses; thirdly screening the sgRNA
library in a
cancer cell line; fourthly extracting cells obtained by screening and
genome DNA of the cells before screening; and finally enriching sgRNA in
genome DNA. Compared with the prior art, the method has the advantages that a
CRISPR / Cas
cell screening process is improved, the
virus infection efficiency is determined with a simple and convenient method by utilizing
puromycin resistance of infected cells, and MOI values of the viruses are determined; more importantly, a
virus packaging method is greatly optimized, so that the
virus packaging efficiency is improved to be more than 5 times that of a conventional method, and large-scale
drug target screening cost can be greatly reduced; and the method is used for promoting industrialization of
cancer drug target screening.