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• W2039224382 abstract "ABSTRACT Genome editing using zinc finger nucleases (ZFNs) has been successfully applied to disrupt CCR5 or CXCR4 host factors and inhibit viral entry and infection. Gene therapy using ZFNs to modify the PSIP1 gene, which encodes the lens epithelium-derived growth factor (LEDGF) protein, might restrain an early step of the viral replication cycle at the integration level. ZFNs targeting the PSIP1 gene (ZFN LEDGF ) were designed to specifically recognize the sequence after the integrase binding domain (IBD) of the LEDGF/p75 protein. ZFN LEDGF successfully recognized the target region of the PSIP1 gene in TZM-bl cells by heteroduplex formation and DNA sequence analysis. Gene editing induced a frameshift of the coding region and resulted in the abolishment of LEDGF expression at the mRNA and protein levels. Functional assays revealed that infection with the HIV-1 R5 BaL or X4 NL4-3 viral strains was impaired in LEDGF/p75 knockout cells regardless of entry tropism due to a blockade in HIV-1 proviral integration into the host genome. However, residual infection was detected in the LEDGF knockout cells. Indeed, LEDGF knockout restriction was overcome at a high multiplicity of infection, suggesting alternative mechanisms for HIV-1 genome integration rather than through LEDGF/p75. However, the observed residual integration was sensitive to the integrase inhibitor raltegravir. These results demonstrate that the described ZFN LEDGF effectively targets the PSIP1 gene, which is involved in the early steps of the viral replication cycle; thus, ZFN LEDGF may become a potential antiviral agent for restricting HIV-1 integration. Moreover, LEDGF knockout cells represent a potent tool for elucidating the role of HIV integration cofactors in virus replication." @default.
• W2039224382 created "2016-06-24" @default.
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• W2039224382 date "2014-08-01" @default.
• W2039224382 modified "2023-10-18" @default.
• W2039224382 title "Zinc Finger Endonuclease Targeting <i>PSIP1</i> Inhibits HIV-1 Integration" @default.
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• W2039224382 doi "https://doi.org/10.1128/aac.02690-14" @default.
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