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• W4386725454 abstract "Abstract Understanding the cellular host factors that promote and inhibit viral entry is important for identifying viral countermeasures. CRISPR whole‐genome screens can be used to rapidly discover host factors that contribute to or impair viral entry. However, when using live viruses and cellular lethality for selection, these screens can identify an overwhelming number of genes without specificity for the stage of the viral infection cycle. New screening methods are needed to identify host machinery contributing to specific steps of viral infection. Here, we developed a CRISPR whole‐genome screen and counter‐screen strategy based on a pseudoviral platform that allowed identification of genes specific to severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) spike and vesicular stomatitis virus glycoprotein (VSV‐G) mediated entry. Screening of SARS‐CoV‐2 spike and VSV‐G on the same lentiviral pseudovirus allowed the identification of entry‐specific genes relative to genes associated with retro‐transcription, integration, and reporter expression from the lentiviral pseudovirus. Second, a Cre‐Gag fusion protein packaged into the pseudovirus was used to bypass retro‐transcription and integration by directly activating a floxed fluorescent protein reporter upon entry reduced the number of gene hits and increase specificity for viral entry. Our approach correctly identified SARS‐CoV‐2 and VSV‐G receptors ACE2 and low‐density lipoprotein receptors, respectively, and distinguished genes associated with retroviral reporter expression from envelope‐mediated entry. Moreover, the CRE‐Gag fusion/flox reporter increased the screen specificity for viral entry‐associated genes. Validation of a few hits demonstrates that this approach distinguishes envelope‐specific host factors from genes affecting reporter expression. Overall, this approach provides a new strategy for identifying host genes influencing viral entry without the confounding complexity of live‐viral screens which produce long gene lists associated with all aspects of viral pathogenesis and replication." @default.
• W4386725454 created "2023-09-15" @default.
• W4386725454 creator A5022778562 @default.
• W4386725454 creator A5024851455 @default.
• W4386725454 creator A5045289344 @default.
• W4386725454 date "2023-09-01" @default.
• W4386725454 modified "2023-10-16" @default.
• W4386725454 title "Whole genome CRISPR screening strategy to identify genes contributing to SARS‐CoV‐2 spike and VSV‐G mediated entry" @default.
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• W4386725454 doi "https://doi.org/10.1002/jmv.29087" @default.
• W4386725454 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37707319" @default.
• W4386725454 hasPublicationYear "2023" @default.
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