Novel endogenous gene expression substituting lentivirus vector and construction method thereof

Abstract

The present invention relates to a novel endogenous gene expression substituting lentivirus vector. According to the present invention, a U6 promoter is inserted between the 5' LTR and the 3' LTR of lentivirus so as to perform transcription of a segment of a shRNA sequence, and the shRNA insertion region contains double restriction enzyme cutting sites such as BamHI and XhoI so as to insert the shRNA sequence after annealing; an EFla promoter is used for transcriptional expression of a Flag tag fused exogenous gene, the Flag tag is fused on the N terminal of the exogenous gene, and the multiple cloning site contains three restriction enzyme cutting sites such as HpaI, EcoRI and NheI3 so as to insert the exogenous gene, wherein the HpaI is the blunt-ended restriction enzyme cutting site so as to ensure insertion of any genes; IRES is used for starting the EGFP reporter gene; and the production of two proteins through the one RNA transcripted from the EFla can be achieved. In addition, the disadvantages of the conventional vectors are overcome, and the fast and efficient intracellular genetically modified way is provided.

Description

technical field [0001] The invention relates to a lentiviral vector, in particular to a novel lentiviral vector for replacing endogenous gene expression and a construction method thereof. Background technique [0002] Lentiviral vector is transformed from human immunodeficiency virus (Human immunodeficiency virus, HIV), which eliminates the pathogenicity of HIV to the greatest extent, and cannot replicate itself, with artificially synthesized foreign genes and artificially improved viruses coat. The advantages of lentiviral vectors are 1) they can infect a variety of cell lines, including dividing and non-dividing cells; 2) they have minimal toxicity and immune response; 3) they are efficiently integrated into the host genome to form a stable exogenous Gene expression, ideal for establishing stable transgenic mouse and human ES cell lines. [0003] The main method of routine gene research is to introduce exogenous genes into cells to make them overexpressed, or to make the...

AI Technical Summary

Problems solved by technology

Conventional simple overexpression of artificially modified genes cannot eliminate the interference of endogenous genes, and simple RNA interference cannot study which amino acid plays an important role in the protein

If RNA interference and overexpression of artificially modified genes are carried out at the same time, the conventional method needs to use a two-step method to interfere and overexpress genes successively, and the operation is very cumbersome

Moreover, if the gene is extremely important for cell survival, it is often impossible to obtain interfering or overexpressed intermediate products, making the entire experiment impossible

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