Provided herein are recombinant rabies virus genomes and recombinant rabies viruses and methods for their use in delivering a transgene into a target cell. Also provided are packaging systems and methods of using the packaging systems to produce recombinant rabies viruses.

The invention provides for systems, methods, and compositions for targeting nucleic acids. In particular, the invention provides non-naturally occurring or engineered DNA-targeting systems comprising a novel DNA-targeting CRISPR effector protein and at least one targeting nucleic acid component like a guide RNA.

The present invention provides a mutant protein of activation-induced cytidine deaminase, wherein hsAID is mutated with the following mutations: T82I, K10E, K34E, E156G, 181*, S38, H130, V152, R174, T100. The present invention also provides a High-efficiency Base Editor, including the mutant protein of activation-induced cytidine deaminase of the present invention and a DNA-specific binding protein, which are linked sequentially via a linking sequence. The present invention also provides a single-base locus-directed editing system, including single-base locus-directed editing proteins and target Hyper Mutation Fragment. Compared with the existing activation-induced cytidine deaminase (AID)-based single-base editing system, the mutant protein inducing system of the present invention has a smaller molecular weight and higher mutation efficiency.

The invention features base editors having reduced non-target deamination, methods of using the base editors, and assays for characterizing base editors as having decreased non-target deamination, e.g. compared to programmed, on-target deamination.

Provided are fusion proteins and related molecules useful for conducting base editing with reduced or no off-target mutations. The fusion proteins may include a first fragment comprising a nucleobase deaminase or a catalytic domain thereof, a second fragment comprising a nucleobase deaminase inhibitory domain, and a protease cleavage site between the first fragment and the second fragment. Also provided are improved prime editing systems, including prime editing guide RNA with improved stability.

This disclosure provides systems, methods, and compositions for RNA-guided RNA-targeting CRISPR effectors for the treatment of diseases as well as diagnostics. In some embodiments, nucleotide deaminase functionalized CRISPR systems for RNA editing RNA knockdown, viral resistance, splicing modulation, RNA tracking, translation modulation, and epi-transcriptomic modifications are disclosed.

Described herein are compositions, systems, methods, and kits utilizing CRISPR-Cas protein fusions comprising a guide nucleotide sequence-programmable RNA binding protein and a RNA base modification protein. The compositions, systems, methods, and kits described herein are useful to modulate RNA methylation and/or cytidine deamination.

Some aspects of this disclosure provide strategies, systems, reagents, methods, and kits that are useful for the targeted editing of nucleic acids, including editing a single site within the genome of a cell or subject, e.g., within the human genome. In some embodiments, fusion proteins of Cas9 and nucleic acid editing enzymes or enzyme domains, e.g., deaminase domains, are provided. In some embodiments, methods for targeted nucleic acid editing are provided. In some embodiments, reagents and kits for the generation of targeted nucleic acid editing proteins, e.g., fusion proteins of Cas9 and nucleic acid editing enzymes or domains, are provided.

The invention features a multi-effector nucleobase editor capable of inducing changes at multiple different bases within a target nucleic acid and methods of using such editors.

Some aspects of this disclosure provide strategies, systems, reagents, methods, and kits that are useful for the targeted editing of nucleic acids, including editing a single site within the genome of a cell or subject, e.g., within the human genome. In some embodiments, fusion proteins of Cas9 and nucleic acid editing enzymes or enzyme domains, e.g., deaminase domains, are provided. In some embodiments, methods for targeted nucleic acid editing are provided. In some embodiments, reagents and kits for the generation of targeted nucleic acid editing proteins, e.g., fusion proteins of Cas9 and nucleic acid editing enzymes or domains, are provided.