Cited by 876CRISPR and Genetic EngineeringVirus-based gene therapy researchRNA Interference and Gene Delivery

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Therapeutic genome editing by combined viral and non-viral delivery of CRISPR system components in vivo

Open access

Abstract

The combination of Cas9, guide RNA and repair template DNA can induce precise gene editing and the correction of genetic diseases in adult mammals. However, clinical implementation of this technology requires safe and effective delivery of all of these components into the nuclei of the target tissue. Here, we combine lipid nanoparticle-mediated delivery of Cas9 mRNA with adeno-associated viruses encoding a sgRNA and a repair template to induce repair of a disease gene in adult animals. We applied our delivery strategy to a mouse model of human hereditary tyrosinemia and show that the treatment generated fumarylacetoacetate hydrolase (Fah)-positive hepatocytes by correcting the causative Fah-splicing mutation. Treatment rescued disease symptoms such as weight loss and liver damage. The efficiency of correction was >6% of hepatocytes after a single application, suggesting potential utility of Cas9-based therapeutic genome editing for a range of diseases.

Overview

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TL;DR

This study combined lipid nanoparticle delivery of Cas9 mRNA with AAV-delivered sgRNA and an HDR template to correct the Fah mutation in a mouse model of hereditary tyrosinemia type I. A single treatment corrected >6% of hepatocytes, restored Fah splicing, and rescued weight loss and liver damage.

Key findings

  • In Fahmut/mut mice, combined nano.Cas9 + AAV-HDR treatment yielded 6.2% ± 1.0% Fah-positive hepatocytes by immunohistochemistry after a single application (n = 4 mice), with correction correlating with nano.Cas9 and AAV-HDR dose.
  • Treated mice had 9.5% restored FAH mRNA without selection, 24.1% average indels at the sgRNA target region, and 0.81% ± 0.08% corrected “G-CC” sequence in total liver DNA by deep sequencing.
  • Treatment completely prevented body weight loss after NTBC withdrawal, all nano.Cas9 + AAV-HDR mice survived 30 days, and serum AST, ALT, and bilirubin indicated substantially reduced liver damage compared with controls.
  • Off-target editing was low at assayed sites: <0.3% indels at three top predicted off-target sites, and in vivo OT1/GOT sites were not substantially higher than background (P > 0.05); transient mRNA Cas9 also reduced off-target editing versus long-term lentiviral Cas9 in cells.

Methods

  • Fahmut/mut mice (8–10 weeks old, male and female) were injected via tail vein with AAV2/8-HDR (6 × 10^11 or 1.2 × 10^12 genome copies) and nano.Cas9 (1 or 2 mg/kg); in the efficacy experiment, AAV-HDR was given at day −14, nano.Cas9 at day −7, and NTBC water was withdrawn at day 0.
  • Cas9 mRNA was chemically modified and formulated with C12-200, cholesterol, C14PEG2000, DOPE, and arachidonic acid in lipid nanoparticles; AAV-HDR encoded U6-sgRNA and a 1.7-kb HDR template designed to correct the mutant “A” to wild-type “G” and introduce a “CC” PAM motif.
  • Analyses included liver immunohistochemistry, serum biomarkers, qRT-PCR, Sanger sequencing, Illumina deep sequencing, GUIDE-Seq in Hepa1-6 cells, and statistics by Student’s t-tests and one-way ANOVA with Tukey post-test.

Limitations

  • Stated: non-viral delivery of DNA into the nucleus in vivo with high efficiency and low toxicity remains difficult, and further improvement of HDR efficacy may require optimizing HDR template design and inhibiting the NHEJ pathway.
  • Stated: the stringent “G-CC” pattern counting may underestimate HDR events, and an alternative explanation for the observed data is partial gene conversion; off-target analysis was limited to predicted and assayed sites.
  • Evident from the text: efficacy was shown only in the Fahmut/mut mouse model, with small group sizes (n = 3–4 mice) and 30-day follow-up, so long-term durability, AAV immunogenicity, and human translation are not established.

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Integrity signals

Registry

Crossref · 10.1038/nbt.3471

Cites

47 of 47 references verified0 citation errors · 0 not checkable

Statistics

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Figures

Figure 1 In vivo delivery of Cas9 mRNA mediates efficient genome editing in cells. (a) C12-200 lipid nanoparticle delivery of Cas9 mRNA into cells. 293T cells stably expressing both EF1a promoter-GFP and U6 promoter-GFP targeting sgRNA (sgGFP) were ncubated with Cas9 mRNA nanoparticles (nano.Cas9). Cas9-mediated frameshift NHEJ events will result in GFP-negative cells. Red arrowhead indicates the Cas9 cutting site. (b) FACS analysis shows that Cas9 mRNA generates GFP-negative cells. Gate R2 indicates 80% GFP-negative cells after nano.Cas9 treatment (n = 3). (c) GFP locus was deep sequenced in nano.Cas9 treated cells (n = 4). Shown are representative indels. (d) Distribution of indels. (e) Indel phase shows that most indels cause a frameshift. For example, 3N + 1 include 1-, 4- and 7-bp indels, 3N + 2 include 2-, 5- and 8-bp indels, and 3N include 3-, 6- and 9-bp indels. (f,g) Transient Cas9 expression by mRNA delivery can reduce off-target genome editing for a VEGFA sgRNA. 293T cells were co-transfected with Cas9 mRNA and pLKO. sgVEGFA (mRNA). 293T cells infected with lentiviral Cas9 were transfected with pLKO.sgVEGFA alone to represent long-term Cas9 expression (lenti). On-target (TS2) (f) and off-target (OT2-2) (g) indel rate was measured by surveyor assay at 2 d. Arrows denote indel bands. *, nonspecific bands. (h) Relative off-target/on-target ratio. The ratio in lenti.Cas9 was set as 1. *P < 0.01 (n = 3). Error bars, mean ± s.d.
Figure 1 In vivo delivery of Cas9 mRNA mediates efficient genome editing in cells. (a) C12-200 lipid nanoparticle delivery of Cas9 mRNA into cells. 293T cells stably expressing both EF1a promoter-GFP and U6 promoter-GFP targeting sgRNA (sgGFP) were ncubated with Cas9 mRNA nanoparticles (nano.Cas9). Cas9-mediated frameshift NHEJ events will result in GFP-negative cells. Red arrowhead indicates the Cas9 cutting site. (b) FACS analysis shows that Cas9 mRNA generates GFP-negative cells. Gate R2 indicates 80% GFP-negative cells after nano.Cas9 treatment (n = 3). (c) GFP locus was deep sequenced in nano.Cas9 treated cells (n = 4). Shown are representative indels. (d) Distribution of indels. (e) Indel phase shows that most indels cause a frameshift. For example, 3N + 1 include 1-, 4- and 7-bp indels, 3N + 2 include 2-, 5- and 8-bp indels, and 3N include 3-, 6- and 9-bp indels. (f,g) Transient Cas9 expression by mRNA delivery can reduce off-target genome editing for a VEGFA sgRNA. 293T cells were co-transfected with Cas9 mRNA and pLKO. sgVEGFA (mRNA). 293T cells infected with lentiviral Cas9 were transfected with pLKO.sgVEGFA alone to represent long-term Cas9 expression (lenti). On-target (TS2) (f) and off-target (OT2-2) (g) indel rate was measured by surveyor assay at 2 d. Arrows denote indel bands. *, nonspecific bands. (h) Relative off-target/on-target ratio. The ratio in lenti.Cas9 was set as 1. *P < 0.01 (n = 3). Error bars, mean ± s.d.CC BY · PubMed Central
Figure 2 In vivo delivery of Cas9 mRNA and AAV-HDR template cures type I tyrosinemia mice. (a) Design of AAV-HDR template and experiments. G->A point mutation at the last nucleotide of exon 8 in Fahmut/mut homozygous mice leads to exon skipping of exon 8. A dual function AAV vector harbors U6-sgRNA and a HDR template (1.7 kb) with the “G” nucleotide to repair the “A” mutation. The “TGG” PAM was modified to “TCC” to prevent self-cleavage. Dashed lines denote homologous recombination. ITR stands for inverted terminal repeat. Black arrows indicate PCR primers for deep sequencing analysis. Fahmut/mut mice were injected with AAV-HDR and nano.Cas9 at indicated time points. Mice were kept off NTBC water at DO. Body weight normalized to pre-injection was monitored over time. (b) Delivery of AAV-HDR and nano.Cas9 fully rescues weight loss upon NTBC withdrawal (n = 3 mice). Error bars, mean ± s.e.m. (c) Liver damage markers (aspartate aminotransferase (AST), alanine aminotransferase (ALT), and bilirubin) were measured in serum *P < 0.01 (n = 3 mice) using one-way ANOVA. Error bars, mean ± s.e.m. (d) Fah+ cells after 30 d off NTBC. Scale bar, 100 μm.
Figure 2 In vivo delivery of Cas9 mRNA and AAV-HDR template cures type I tyrosinemia mice. (a) Design of AAV-HDR template and experiments. G->A point mutation at the last nucleotide of exon 8 in Fahmut/mut homozygous mice leads to exon skipping of exon 8. A dual function AAV vector harbors U6-sgRNA and a HDR template (1.7 kb) with the “G” nucleotide to repair the “A” mutation. The “TGG” PAM was modified to “TCC” to prevent self-cleavage. Dashed lines denote homologous recombination. ITR stands for inverted terminal repeat. Black arrows indicate PCR primers for deep sequencing analysis. Fahmut/mut mice were injected with AAV-HDR and nano.Cas9 at indicated time points. Mice were kept off NTBC water at DO. Body weight normalized to pre-injection was monitored over time. (b) Delivery of AAV-HDR and nano.Cas9 fully rescues weight loss upon NTBC withdrawal (n = 3 mice). Error bars, mean ± s.e.m. (c) Liver damage markers (aspartate aminotransferase (AST), alanine aminotransferase (ALT), and bilirubin) were measured in serum *P < 0.01 (n = 3 mice) using one-way ANOVA. Error bars, mean ± s.e.m. (d) Fah+ cells after 30 d off NTBC. Scale bar, 100 μm.CC BY · PubMed Central
Figure 3 In vivo delivery of Cas9 mRNA and AAV corrects Fah mutation. (a) Fahmut/mut mice were kept on NTBC water and euthanized 7 d after nano.Cas9 treatment to estimate initial repair rate. (b) Fah immunohistochemistry (IHC). Scale bars are 200 μm for upper and lower panels, respectively. The lower panel of AAV-HDR + nano.Cas9 is a high-magnification view (box with black dashed line). (c) Fah+ positive cells were counted to determine the percentage. (d) Quantitative RT-PCR measurement of wild-type expression of Fah mRNA. (e) Sequence of repaired Fah mRNA in treated mice. QRT-PCR band of exon 8 to exon 9 spliced mRNA in (d) was sequenced. The corrected G nucleotide is circled. (f) Indels and (g) “G-CC” recombination pattern in total DNA from liver by Illumina sequencing. *P < 0.01 (n = 4 mice) using one-way ANOVA. Error bars, mean ± s.e.m.
Figure 3 In vivo delivery of Cas9 mRNA and AAV corrects Fah mutation. (a) Fahmut/mut mice were kept on NTBC water and euthanized 7 d after nano.Cas9 treatment to estimate initial repair rate. (b) Fah immunohistochemistry (IHC). Scale bars are 200 μm for upper and lower panels, respectively. The lower panel of AAV-HDR + nano.Cas9 is a high-magnification view (box with black dashed line). (c) Fah+ positive cells were counted to determine the percentage. (d) Quantitative RT-PCR measurement of wild-type expression of Fah mRNA. (e) Sequence of repaired Fah mRNA in treated mice. QRT-PCR band of exon 8 to exon 9 spliced mRNA in (d) was sequenced. The corrected G nucleotide is circled. (f) Indels and (g) “G-CC” recombination pattern in total DNA from liver by Illumina sequencing. *P < 0.01 (n = 4 mice) using one-way ANOVA. Error bars, mean ± s.e.m.CC BY · PubMed Central

Verification

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32 Own result · 31 Not checked yet · 14 Own interpretation · 2 Own method · 1 No basis given

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  • The paper relies on this without support.

    Clinical implementation of CRISPR genome editing requires safe and effective delivery of all components into the nuclei of the target tissue.

    “However, clinical implementation of this technology requires safe and effective delivery of all of these components into the nuclei of the target tissue.”
  • The paper relies on this without support.

    Improvements to CRISPR delivery methods and HDR efficiency are required for therapeutic application of genome editing for disease gene correction.

    “However, improvements to CRISPR delivery methods and HDR efficiency are required for therapeutic application of genome editing for disease gene correction.”
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Metadata

Authors
Yin, H., Song, C.-Q., Dorkin, J. R., Zhu, L. J., Li, Y., Wu, Q., Park, A., Yang, J., Suresh, S., Bizhanova, A., Gupta, A., Bolukbasi, M. F., Walsh, S., Bogorad, R. L., Gao, G., Weng, Z., Dong, Y., Koteliansky, V., Wolfe, S. A., Langer, R., Xue, W., & Anderson, D. G.
Affiliations
  • Koch Institute for Integrative Cancer Research At MIT (US)
  • University of Massachusetts Chan Medical School (US)
  • Tongji University (CN)
  • The Ohio State University (US)
  • Skolkovo Institute of Science and Technology (RU)
  • Harvard–MIT Division of Health Sciences and Technology (US)
Corresponding author
  • Xue, Wen
  • Anderson, Daniel G
Venue
Nature Biotechnology
Published
2016-02-01
Volume
34
Issue
3
Pages
328-333
ISSN
  • 0733-222X (ISSN-L)
  • 1087-0156
  • 1546-1696
OpenAlex
W2260024370
Cited by
876
References
47
Citations by year
2026: 26 · 2025: 56 · 2024: 44 · 2023: 52 · 2022: 90 · 2021: 108 · 2020: 110 · 2019: 104 · 2018: 128 · 2017: 112 · 2016: 46
FWCI
67.54
Type
journal article
Language
en
Open access
Locations
  • Nature Biotechnology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion, cc-by)
  • PubMed Central (acceptedVersion, cc-by)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
  • eScholarship@UMassChan (submittedVersion)
Funders
  • National Institutes of Health (1f32eb017625-01)
  • National Eye Institute (P30EY012196)
  • National Cancer Institute (5‑U54‑CA151884‑04, U54CA151884, R00CA169512, P30CA014051, P30-CA-14051)
  • National Institute of Biomedical Imaging and Bioengineering (1F32EB017625, F32 EB017625)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
Keywords
therapeutic genome editing, CRISPR/Cas9, lipid nanoparticle delivery, adeno-associated virus vectors, hereditary tyrosinemia, fumarylacetoacetate hydrolase
MeSH terms
Animals, Disease Models, Animal, Genetic Vectors, Humans, Lipids, Mutation, Viruses, Genome, Human, RNA Editing, Gene Transfer Techniques, Tyrosinemias, Mice, Nanoparticles, CRISPR-Cas Systems

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