Method for human CTLA4 gene specific knockout through CRISPR-Cas9 (clustered regularly interspaced short palindromic repeat) and sgRNA(single guide RNA)for specially targeting CTLA4 gene
A pgl3-u6-hctla4sg, specific technology, applied in the field of genetic engineering, can solve the problems of expensive, time-consuming and expensive antibody drugs
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Embodiment 1
[0059] Example 1 Design and synthesis of sgRNA for specific targeting of CTLA4 gene in CRISPR-Cas9 specific knockout of human CTLA4 gene
[0060] 1. Design of sgRNA targeting human CTLA4 gene:
[0061] (1) Select the 5'-GGN(19)GG sequence on the CTLA4 gene. If there is no 5'-GGN(19)GG sequence, 5'-GN(20)GG or 5'-N(21)GG is also Can.
[0062] (2) The targeting site of the sgRNA on the CTLA4 gene is located in the exon of the gene, which is more likely to cause the deletion of the fragment or the frame-shift mutation, so as to achieve the purpose of complete gene inactivation.
[0063] (3) The targeting sites of sgRNA on the CTLA4 gene are located on the common exons of different splicing forms.
[0064] (4) Use BLAT in the UCSC database or BLAST in the NCBI database to determine whether the target sequence of the sgRNA is unique and reduce potential off-target sites.
[0065] According to the above method, we designed a total of 67 sgRNAs targeting the human CTLA4 gene, the ...
Embodiment 2
[0085] Example 2 Using CRISPR-Cas9 to specifically knock out the human CTLA4 gene (the sgRNA used to target the CTLA4 gene is shown in the sequence table as SEQ ID NO.36)
[0086] 1. The linearized sequence is the pGL3-U6-sgRNA plasmid shown in the sequence table SEQ ID NO.10.
[0087] Enzyme digestion system and conditions are as follows:
[0088] 2 μg pGL3-U6-sgRNA (400ng / μl);
[0089] 1μl CutSmart Buffer;
[0090] 1 μl BsaI (NEB, R0535L);
[0091] Replenish water to 50 μl, incubate at 37°C for 3-4 hours, shake and centrifuge at regular intervals to prevent droplets from evaporating onto the tube cap.
[0092] After digestion, use AxyPrep PCR Clean up Kit (AP-PCR-250) to purify and recover to 20-40 μl sterilized water.
[0093] 2. Combine the double-stranded sgRNA oligonucleotides obtained after denaturation and annealing that can be connected to the U6 eukaryotic expression vector (the sequences of their Forward oligo and Reverse oligo are shown in the sequence table SE...
Embodiment 3
[0123] Example 3 Using CRISPR-Cas9 to specifically knock out the human CTLA4 gene (the sgRNA used to target the CTLA4 gene is shown in the sequence table SEQ ID NO.84)
[0124] 1. The linearized sequence is the pGL3-U6-sgRNA plasmid shown in the sequence table SEQ ID NO.10. Enzyme digestion system and conditions are as follows:
[0125] 2 μg pGL3-U6-sgRNA (400ng / μl);
[0126] 1μl CutSmart Buffer;
[0127] 1 μl BsaI (NEB, R0535L);
[0128] Replenish water to 50 μl, incubate at 37°C for 3-4 hours, shake and centrifuge at regular intervals to prevent droplets from evaporating onto the tube cap.
[0129] After digestion, use AxyPrep PCR Clean up Kit (AP-PCR-250) to purify and recover to 20-40 μl sterilized water.
[0130]2. The double-stranded sgRNA oligonucleotides obtained after denaturation and annealing that can be connected to the U6 eukaryotic expression vector (the sequences of their Forward oligo and Reverse oligo are shown in the sequence table SEQ ID NO.3 and 4, resp...
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