Abstract
Covalently closed circular DNA (cccDNA) of hepatitis B virus (HBV) is the major cause of viral persistence and chronic hepatitis B. CRISPR/Cas9 nucleases can specifically target HBV cccDNA for decay, but off-target effects of nucleases in the human genome limit their clinical utility. CRISPR/Cas9 systems from four different species were co-expressed in cell lines with guide RNAs targeting conserved regions of the HBV genome. CRISPR/Cas9 systems from Streptococcus pyogenes (Sp) and Streptococcus thermophilus (St) targeting conserved regions of the HBV genome blocked HBV replication and, most importantly, resulted in degradation of over 90% of HBV cccDNA by 6 days post-transfection. Degradation of HBV cccDNA was impaired by inhibition of non-homologous end-joining pathway and resulted in an erroneous repair of HBV cccDNA. HBV cccDNA methylation also affected antiviral activity of CRISPR/Cas9. Single-nucleotide HBV genetic variants did not impact anti-HBV activity of St CRISPR/Cas9, suggesting its utility in targeting many HBV variants. However, two or more mismatches impaired or blocked CRISPR/Cas9 activity, indicating that host DNA will not likely be targeted. Deep sequencing revealed that Sp CRISPR/Cas9 induced off-target mutagenesis, whereas St CRISPR/Cas9 had no effect on the host genome. St CRISPR/Cas9 system represents the safest system with high anti-HBV activity.
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Acknowledgements
We thank Konstantin Severinov and Dieter Glebe for their helpful contributions, Yurii Babin and Konstantin Flyagin for technical assistance, and Vladimir Simirskii for access to microscopy.
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DK, SB, and AK conducted all experiments; DZ and SB generated recombinant cccDNA and created gRNAs; DZ analyzed off-target sites and designed specific primers; IG conducted sequencing; DK conceived the project; AK helped conceive experiments with mutant gRNAs; DK, DZ, SB, and AK processed the data; DK wrote the manuscript; VC guided the study and revised the manuscript.
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The authors declare that they have no potential conflicts of interests. The authors have applied for patents concerning the use of Cas9 proteins and gRNAs for HBV therapy.
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This work was supported by RSF Grant no. 16-15-10426.
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Kostyushev, D., Brezgin, S., Kostyusheva, A. et al. Orthologous CRISPR/Cas9 systems for specific and efficient degradation of covalently closed circular DNA of hepatitis B virus. Cell. Mol. Life Sci. 76, 1779–1794 (2019). https://doi.org/10.1007/s00018-019-03021-8
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DOI: https://doi.org/10.1007/s00018-019-03021-8