Method for quickly building CRISPR gene editing liver cancer cell strain and cell strain
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A liver cancer cell, gene editing technology, applied in the field of gene editing targeting tumor cells, can solve problems such as unsatisfactory efficiency
Pending Publication Date: 2020-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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[0005] At present, the efficiency of obtaining gene-edited positive cell lines from liver cancer cell lines introduced with sgRNA and Cas9 through drug screening is far from ideal. The high-efficiency cell monocloning is the technical progress of the present invention to overcome this obstacle, and it will provide a basis for the rapid establishment of gene-edited liver cancer cells in the future. Cell lines lay a solid foundation
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Embodiment 1
[0053] Example 1. Using optimized CRISPR / Cas9 technology to construct LM3 liver cancer cell line with knockout of CPQ gene
[0054] (1) With the Lentivirus V2 vector (Zhang Feng Lab, MIT) as the basic skeleton, the genome sequence of the human CPQ gene was downloaded from NCBI and the structure was analyzed to find the transcription start region, and a pair was selected based on the online design of this region sgRNA, its upstream and downstream sgRNA sequences are as follows:
[0055] sgRNA1 CTTATCTTCGCATTTTTCGG(TGG)
[0056] sgRNA2 CAGAAGTGCCAATCGCTCAT(AGG)
[0057] Among them, the three bases in brackets are the PAM domain (NGG)
[0058] The sequences of four primers were designed as follows:
[0059] KOCPQ primer I (sgRNA1 sequence is underlined)
[0108] After extracting the knockout MTDH gene recombinant plasmid obtained in the present invention and measuring the concentration of the plasmid with NanoDrop1000, the integrity of the plasmid is detected by electrophoresis.
[0109] (2) 24 hours before cell transfection, inoculate a cell density of 8×10 in a 100 mm cultur...
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Abstract
The invention discloses a method for quickly building a CRISPR gene editing liver cancer cell strain. According to the method disclosed by the invention, a CRISPR/Cas 9 technique is improved, recombinant plasmids better in expression efficiency are constructed, quick monoclone culture is combined, and a stable gene knockout liver cancer cell strain is constructed. Required sgRNA is accurately obtained through primer synthesis, an inserting fragment is synthetized through two-step PCR, a carrier is loaded, and recombinant plasmids for knockout are constructed; after slow viruses are packaged, the packaged slow viruses and liver cancer cells are co-incubated, and sgRNA and Cas9 proteins of equal quantity are transmitted into the liver cancer cells at the same time through slow virus mediating; and liver cancer cells after gene editing are subjected to puromycin resistance screening and monoclone culture, and finally, a gene knock-out positive stable liver cancer cell strain is quickly obtained. According to the method disclosed by the invention, important experimental materials are provided for researching a molecular mechanism of the gene in generation and development of tumors, andreference is provided for in vitro cell modeling of liver cancer diseases.
Description
technical field [0001] The present invention relates to the field of gene editing targeting tumor cells in the field of biomedical research, specifically, the present invention relates to a method for rapidly obtaining gene-edited liver cancer cell lines. Background technique [0002] Liver cancer is the cancer with the second highest mortality rate in the world. In my country, the morbidity and mortality of liver cancer are very high, seriously endangering the health and quality of life of the people. Therefore, the study on the pathogenesis of liver cancer has become one of the hot spots in the study of tumor biology. Liver cancer is a disease of genetic abnormalities. Hundreds or thousands of mutations are formed in cancer cells, which makes it difficult for DNA sequencing technology to identify cancer-causing mutation genes. In addition, many liver cancer regulatory genes are difficult to discover by sequencing because they are not mutated but are otherwise deregulated...
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