University of Massachusetts Medical School Faculty Publications

UMMS Affiliation

RNA Therapeutics Institute; Horae Gene Therapy Center; Department of Microbiology and Physiological Systems; ​Department of Molecular, Cell and Cancer Biology; Program in Molecular Medicine; Li Weibo Institute for Rare Diseases Research; Viral Vector Core; Graduate School of Biomedical Sciences

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Article Preprint


Genetics and Genomics | Molecular Biology | Nucleic Acids, Nucleotides, and Nucleosides | Therapeutics | Viruses


Adeno-associated virus (AAV) vectors are important delivery platforms for therapeutic genome editing but are severely constrained by cargo limits, especially for large effectors like Cas9s. Simultaneous delivery of multiple vectors can limit dose and efficacy and increase safety risks. The use of compact effectors has enabled single-AAV delivery of Cas9s with 1-3 guides for edits that use end-joining repair pathways, but many precise edits that correct disease-causing mutations in vivo require homology-directed repair (HDR) templates. Here, we describe single-vector, ~4.8-kb AAV platforms that express Nme2Cas9 and either two sgRNAs to produce segmental deletions, or a single sgRNA with an HDR template. We also examine the utility of Nme2Cas9 target sites in the vector for self-inactivation. We demonstrate that these platforms can effectively treat two disease models [type I hereditary tyrosinemia (HT-I) and mucopolysaccharidosis type I (MPS-I)] in mice. These results will enable single-vector AAVs to achieve diverse therapeutic genome editing outcomes.


Molecular Biology, Cas9, Genome Editing, virus vectors, therapeutics

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bioRxiv 2020.10.09.333997; doi: Link to preprint on bioRxiv.


This article is a preprint. Preprints are preliminary reports of work that have not been certified by peer review.

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Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.