33results about How to "Knockout Efficient" patented technology

The invention provides a specific sgRNA combined with an immunogene to inhibit HBV replication, an expression vector thereof, and an application of the specific sgRNA and the expression vector. The sgRNA sequences of a human hepatitis B virogene suitable for CRISPR-Cas9 targeting editing and a PD-1 gene are designed, the plasmid vector of the sgRNA inhibiting HBV and PD-1 genes is constructed, and the plasmid vector and a nuclease gene expression vector are transferred to HBV transgenic mice, and can obviously inhibit HBV DNA replication. The gene expression vector prepared in the invention has the advantages of simple method steps, good sgRNA targeting property, and high CRISPR-Cas9 knockout efficiency. The sgRNAs specifically targeting the HBV and PD-1 genes can accurately splice the HBV and PD-1 genes, inhibit in vivo hepatitis B virus replication, and reduce the hepatitis B virus antigen expression.

The invention discloses a method for pig CMAH gene specific knockout through CRISPR-Cas9 and sgRNA for specially targeting a CMAH gene. A target sequence of the sgRNA for specially targeting the CMAH gene on the CMAH gene meets a 5'-N(20)NGG-3' sequence arrangement rule, wherein the N(20) represents 20 continuous bases, and each N represents A, T, C or G; the target sequence on the CMAH gene locates at a 5-exon coding area or a junction position of adjacent introns of an N end of the CMAH gene; and the target sequence on the CMAH gene is unique. The sgRNA is used in a method for pig CMAH gene specific knockout through the CRISPR-Cas9, the pig CMAH gene can be rapidly, accurately, efficiently and specifically knocked out, and the problems of the long period and high cost of construction of a CMAH gene knockout pig are effectively solved.

The invention discloses a method for CRISPR-Cas9 specific knockout of a pig GGTA1 gene and sgRNA for a specific targeted GGTA1 gene. The target sequence of the sgRNA for the specific targeted GGTA1 gene on the GGTA1 gene is in accordance with the sequence arrangement rule of 5'-N(20)NGG-3', wherein N(20) represents 20 continuous bases, and each N represents A or T ot C or G; the target sequence on the GGTA1 gene is positioned at a junction of 5 exon coding areas and/or adjacent introns of the N-end of the GGTA1 gene; and the target sequence on the GGTA1 gene is unique. According to the method for CRISPR-Cas9 specific knockout of the pig GGTA1 gene via sgRNA, specific knockout of the pig GGTA1 gene can be rapidly and accurately realized with high efficiency, and the problems of long period and high cost for constructing the knockout of the pig GGTA1 gene can be effectively solved.

The invention discloses a plant gene knockout vector based on a CRISPR/Cas9 technology. The monocotyledon plant gene knockout vector is characterized in that the plant gene knockout vector is a monocotyledon plant CRISPR/Cas9 knockout vector pCambin1300-OsU3-Cas9, and contains the AarI insertion site. According to the present invention, with the CRISPR/Cas9 plant knockout double-component vector pCambin1300-OsU3-2x35s-Cas9 formed from a sgRNA-OsU3 structure sequence comprising the AarI insertion site and a 2x35s-Cas9-ter sequence, the purpose of the efficient and rapid construction of the monocotyledon plant gene knockout vector can be achieved through the one-step digestion linkage method; and the provided CRISPR/Cas9 knockout vector pCambin1300-OsU3-2x35s-Cas9 has characteristics of high targeting efficiency and extremely low undershoot efficiency, and can be used for plant target gene knockout or can be used for plant gene editing in a kit form.

The invention discloses a method using CRISPR-Cas9 to specifically knock off pig PDX1 gene and sgRNA of PDX1 gene for specific targeting. The target sequence of sgRNA of PDX1 gene for specific targeting on PDX1 gene is accord with the sequence alignment rule of 5'-N(20)NGG-3', wherein N(20) represents 20 continuous bases, and each N represent A, T, C or G; the target sequence of PDX1 gene is arranged in the first exon coding region on the N terminal of PDX1 gene or a junction between the coding region and neighbored intron, and the target sequence of PDX1 gene is unique. The provided method can rapidly, precisely, efficiently and specifically knock off PDX1 gene of pigs, and solves the problems of long period and high cost of pig PDX1 gene knocking.

The invention provides a high-efficiency knockout method for the XBP1 gene in a DC cell. The high-efficiency knockout method for the XBP1 gene in the DC cell comprises the following steps: designing of a gene knockout target and oligonucleotide; annealing of oligonucleotide; enzyme digestion of a linearized vector; connection and reaction of the linearized vector with double-strand oligonucleotide; transformation of competent cells and knockout of the XBP1 gene in the DC cell; etc. According to the invention, the knockout method provided by the invention employs an improved CRISPR/pCas9 gene knockout system, uses the XBP1 as a target gene for designing of a CRISPR targeting sequence and preparation of pCas9/gRNA1-XBP1 plasmid and further allows the plasmid to transfect the DC cell under the treatment action of an L189 drug; thus, the XBP1 gene in the DC cell can be effectively knocked out, the immunostimulation effect of the DC cells can be effectively guaranteed, and antineoplastic immunization effect of the DC cell is given to effective play.

The invention discloses a sgRNA sequence for specifically targeting an arabidopsis ILK2 gene and application of the sgRNA sequence. The nucleotide sequence of the sgRNA sequence is represented by SEQ ID NO.1. Two single-chain oligo DNA sequences are designed and synthesized according to a sgRNA guide sequence, a double chain is formed through annealing and is linked with a Cas9 carrier, a sgRNA coding sequence and a CRISPR system are introduced into Arabidopsis by using an agrobacterium-mediated genetic transformation technique, a target sequence is shorn by a Cas9 protein under the guidance of sgRNA, and therefore, the knockout of an ILK2 gene is realized. According to the sgRNA sequence provided by the invention, the ILK2 gene can be knocked out or edited by virtue of a CRISPR-Cas9 system, so as to analyze the functions of the arabidopsis ILK2 gene.

The invention discloses establishment of a carrier based on a fish CRISPR/Cas9 system by using a gene knockout method ad an establishing method of the carrier, and relates to a carrier based on the fish CRISPR/Cas9 system and an establishing method of the carrier, so as to solve the problems that in a conventional transgenosis method the position that transgenosis is inserted into genome is hard to confirm and potential safety hazard can be generated when external DNA is led into cells and is randomly integrated by using a microscopic injection method, an electroporation method, a sperm carrier method and the like, and the problems that a conventional gene knockout method is complex in process, high in requirement on techniques, high in expense and long in experiment period, and the success rate is limited by multiple factors. By co-ejecting two non-integrated knockout carriers, namely, pX330-MSTN a and pX330-MSTN b, into zygotes of fishes in the 1-2 cell stages, high-efficiency and rapid gene knockout can be achieved.

The present invention provides an sgRNA specifically targeting a human DNMT1 gene based on a CRISPR/Cas9 system, a use thereof for guiding the CRISPR/Cas9 system in a drug for treatment and/or prevention of tumors, and a method correspondingly constructing a sgRNA expression vector. The CRISPR/Cas9 system can rapidly, efficiently and specifically knock out the human DNMT1 gene, induces inactivation of the DNMT1 gene in tumor cells, inhibits expression of the DNMT1 and methylation of DNA and thus inhibits tumor cell growth.

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.

The invention discloses a CRISPR/Cas9 vector suitable for paraconiothyrium hawaiiense FS482 as well as a construction method and application of the CRISPR/Cas9 vector. According to the invention, a recombinant paraconiothyrium hawaiiense FS482 strain with knocked-out diterpenoid new skeleton compound biosynthetic genes is constructed by utilizing a novel CRISPR/Cas9 system after promoter optimization for the first time, and an efficient CRISPR/Cas9 gene knockout system suitable for deep sea fungus paraconiothyrium hawaiiense FS482 is established; and therefore, a molecular biological foundation is laid for clarification of a biosynthesis mechanism of the novel active secondary metabolite of the paraconiothyrium hawaiiense FS482 and obtaining of more novel secondary metabolites with remarkable biological activity.

The invention discloses a construction method of a CNN3 gene knockout mouse model based on a Cre-FloxP system, which comprises the following steps: respectively inserting FloxP gene segments at two sides of a second exon of a CNN3 gene, constructing a Cas9/gRNA target and a homologous recombination template, carrying out microinjection on the homologous recombination template and donor DNA into a fertilized egg of a mouse to obtain a Cnn3-FloxP mouse, and carrying out Cre-FloxP system-based CNN3 gene knockout mouse model; after mating with a female mouse, conducting selfing to obtain a stably inherited homozygote CNN3fl/fl mouse; after the homozygote CNN3fl/fl mouse and a Cre mouse with tissue specific expression are copulated, conducting selfing, and screening out the mouse with the genotype of Cre +/-/CNN3fl/fl through gene recognition. The invention relates to the technical field of gene design, can efficiently construct a mouse with specific tissue or specific cell CNN3 gene knockout, and greatly improves the construction efficiency and the construction success rate of the mouse model with the selective CNN3 knockout function.

The invention relates to a construction method of a porcine TFF1 gene knockout cell line based on a CRISPR-Cas9 gene editing technology. The TFF1 gene sequence in IPEC-J2 cells is knocked out by adopting the CRISPR/Cas9 technology, and the TFF1 gene knockout IPEC-J2 cell line is established and can be used for functional verification of a TFF1 gene in porcine breeding for disease resistance, and an action mechanism of the TFF1 gene in disease resistance is disclosed.

The invention discloses CRISPR/Cas9 systems and an application of the CRISPR/Cas9 systems in construction of alpha, beta and alpha-beta thalassemia model pig cell lines. A pair of target sequences isdesigned for each of pig HBA and HBB genes, three CRISPR/Cas9 systems are constructed by the two pairs of target sequences, each CRISPR/Cas9 system comprises a gRNA carrier and a Cas9 expression carrier, the expression carriers in the three CRISPR/Cas9 systems are respectively transferred into pig fibroblasts in proportion, and the alpha, beta and alpha-beta thalassemia model pig cell lines are obtained by screening. Single gene mutation and combined gene mutation are respectively caused to the pig HBA and HBB genes in the pig primary fibroblasts through a gene editing technology, and HBA, HBBand HBA-HBB gene mutant cells are obtained.