Engineering of HEK293T Cell Factory for Lentiviral Production by High-Throughput Selected Genes.

Lentiviral vectors (LVs) are crucial tools in gene therapy and bioproduction, but high-yield LV production systems are urgently needed. Using clustered regularly interspaced short palindromic repeats (CRISPR)-CRISPR-associated protein 9 high-throughput screening, we identified nine critical genes (, and ) from 17,501 genes that limit LV packaging and formation. Knocking out these genes in HEK293T cells significantly increased virus production, with knockout exhibiting a 6.63-fold increase. Studies on multigene knockouts demonstrated that the cumulative effects of different gene knockouts can significantly enhance lentivirus production in HEK293T cells. Triple knockout of , and increased LV titer by ∼8.33-fold, and knockout (or knockdown) of and increased LV titer by ∼6.53-fold. This study established HEK293T cell lines with multiple genes knockout for efficient LV production, providing reliable technical support for LV production and application and offering new perspectives for studying LV packaging mechanisms and related virus research.