Abstract
A major reason that Acquired Immune Deficiency Syndrome (AIDS) cannot be completely cured is the human immunodeficiency virus 1 (HIV-1) provirus integrated into the human genome. Though existing therapies can inhibit replication of HIV-1, they cannot eradicate it. A molecular therapy gains popularity due to its specifically targeting to HIV-1 infected cells and effectively removing the HIV-1, regardless of viral genes being active or dormant. Now, we propose a new method which can excellently delete the HIV provirus from the infected human T cell genome. First, we designed zinc-finger nucleases (ZFNs) that target a sequence within the long terminal repeat (LTR) U3 region that is highly conserved in whole clade. Then, we screened out one pair of ZFN and named it as ZFN-U3. We discovered that ZFN-U3 can exactly target and eliminate the full-length HIV-1 proviral DNA after the infected human cell lines treated with it, and the frequency of its excision was about 30 % without cytotoxicity. These results prove that ZFN-U3 can effciently excise integrated HIV-1 from the human genome in infected cells. This method to delete full length HIV-1 in human genome can therefore provide a novel approach to cure HIV-infected individuals in the future.
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This work was supported by National Natural Science Funding of China (31271418 and 31171247) and the National Grand Program on Key Infectious Disease (2014ZX10001003).
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11033_2014_3456_MOESM1_ESM.tif
Conservation analysis of ZFN-U3 binding sequence and LoxLTR sequence recognized by Tre-recombinase in different HIV-1 subtypes. a The ZFN-U3 binding sequence, located at 408–440 bp within the HXB2 reference isolate (GenBank accession number K03455) (TIFF 5555 kb).
11033_2014_3456_MOESM2_ESM.tif
Conservation analysis of ZFN-U3 binding sequence and LoxLTR sequence recognized by Tre-recombinase in different HIV-1 subtypes. b the LoxLTR sequence, located at 193–226 of the HXB2 reference isolate, were aligned with all HIV-1 genome sequences in the Los Alamos HIV Sequence Database (http://www.hiv.lanl.gov/) using a web alignment tool (http://www.hiv.lanl.gov/content/sequence/NEWALIGN/align.html). Then the alignments were used to highlight mismatches using the Highlighter for Nucleotide Sequences v2.1.1 online (http://www.hiv.lanl.gov/content/sequence/HIGHLIGHT/HIGHLIGHT_XYPLOT/highlighter.html). Mismatches are represented in different colors: A Green, T Red, G Orange, C Light blue, Gaps-Gray. For ZFN-U3 binding sequences, the total number of analyzed ZFN-U3 binding sequences was 299 and the average similarity was 0.922, while for LoxLTR, the total number of analyzed sequences was 269 and the average similarity was 0.775. (TIFF 4056 kb)
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Qu, X., Wang, P., Ding, D. et al. Zinc finger nuclease: a new approach for excising HIV-1 proviral DNA from infected human T cells. Mol Biol Rep 41, 5819–5827 (2014). https://doi.org/10.1007/s11033-014-3456-3
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DOI: https://doi.org/10.1007/s11033-014-3456-3