A method for editing gene fusions

Abstract

The invention provides a fusion gene editing method, which is characterized in that the editing method includes: (1) designing a sgRNA near the natural breakpoints of the two genes involved in the fusion; (2) designing a recombinant The AAV vector enables homologous recombination repair of two DNA breaks. Using this method can ensure that no matter the natural breakpoint is within an exon, an exon boundary or an intron region, the sequence of the obtained fusion gene is completely consistent with the natural sequence, which overcomes the inaccurate breakpoint sequence of the existing method. question.

Description

technical field [0001] The invention belongs to the field of molecular technology, and in particular relates to a method for editing gene fusion. Background technique [0002] Fusion gene refers to the process of fusion of all or part of the sequences of two genes into a new gene, which may be the result of chromosomal translocation, middle deletion or chromosomal inversion. Among them, chromosomal translocation is an important way to form fusion genes. The main reason is that DNA double-strand breaks or two adjacent DNA single-strand breaks are repaired incorrectly, resulting in changes in the position of chromosome fragments. Fusion genes can produce tumorigenesis through two mechanisms: one is the overexpression of a gene at one of the breakpoints, and the other is the fusion of two genes to generate a hybrid gene. At present, more than 300 fusion genes have been found in various hematological and solid tumors, and there is a large amount of evidence that gene fusion cau...

AI Technical Summary

Problems solved by technology

However, the above methods have their own problems: (1) the expression of the fusion gene is not at a physiological level; (2) the fusion gene cannot be completely silenced; (3) the patient-derived cell line cannot reproduce the initial stage of cancer development in vivo

This inaccurate breakpoint has a potential impact on the function of the fusion gene, especially the fusion between exons, such as COSF571 ( ETV6 Gene exon 5 and NTRK3 fusion between gene exon 15), COSF1434 ( FGFR3 Gene exon 17 and TACC3 The fusion between the 10th exon of the gene), etc., the inaccurate connection at the breakpoint will cause the destruction of the open reading frame or the premature termination of the translation due to the frameshift mutation during the translation process, and finally cannot form a functional protein; at the same time, inaccurate breakpoints are not conducive to the evaluation of the performance of molecular diagnostic tests in clinical practice

Currently, there is no method in the literature that enables accurate editing of fusion gene breakpoints

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