The invention discloses application of an adenine base editor in DFNA15 deaf mice, and belongs to the technical field of
hearing loss treatment. The invention provides nine types of novel ABE fusion proteins, namely SchABE8e, SchABE8e-N108Q, SchABE9, SchABE8e, SchABE8e-N108Q and SchABE9. The
reagent is composed of SpeABE8e, SpeABE8e-N108Q, SpeABE9, SpeABE8e, SpeABE8e-N108Q, the invention relates to the technical field of
chemical engineering, in particular to the
chemical engineering of Sha2ABE8e, Sha2ABE8e-N108Q, Sha2ABE9 and Sha2ABE8e-N108Q. The
fusion protein comprises an SchCas9
nuclease nick
enzyme and a TadA-8e deaminase, wherein the
amino acid sequence of the SchCas9
nuclease nick
enzyme is SEQ ID NO. 19, and the
amino acid sequence of the TadA-8e deaminase is SEQ ID NO. The
amino acid sequence of the TadA-8e deaminase is as shown in SEQ ID NO. 20. The invention provides a novel base editing tool with wide targeting range, high editing activity and smaller size, and provides more powerful support for
gene therapy research of
hereditary diseases. The screened SchABE8e base editor is comprehensively tested on an endogenous target spot, and the accurate and efficient editing performance of the SchABE8e base editor is verified through multiple dimensions such as editing efficiency, an editing window, product purity, indels and off-target activity. The wide targeting range of the editor enables the editor to be suitable for
gene therapy research of various
hereditary diseases.