87 results about "Gene Knockout Techniques" patented technology

The invention discloses miR-124 gene knockout murine animal models. The murine animal models refer to mice with miR-124-1, miR-124-2 and miR-124-3 genes knocked out. With the adoption of a Crispr-cas9 gene knockout technology, microRNA (micro ribonucleic acid) miR-124 genes with the highest expression quantity in the brains of the mice are knocked out. The obtained mice show obvious nervous system disease states such as reduction of locomotor activity, deterioration of learning and memorizing abilities, increase of soluble amyloid beta protein and the like. Therefore, the simple, reliable and economical animal models can be provided for research of nervous system disease pathology and screening of drugs for treating nervous system diseases.

The invention relates to a method for preparing an atherosclerosis disease canine model, in particular to a method for preparing an apolipoprotein E (APOE) gene knockout disease canine model according to a gene knockout technology.

The invention discloses a construction method of an Amy1 gene knockout mouse animal model and application. An Amy1 gene knockout mouse model is constructed based on a CRISPR / Cas9 gene knockout technology. The construction method comprises the following steps: step 1, designing sgRNA and Cas9 RNA, performing in-vitro transcription to obtain mRNA, and performing microinjection of the active sgRNA and Cas9 RNA on fertilized eggs of a mouse to obtain an Amy1 gene knockout mouse; and step 2, identifying the Amy1 gene knockout mouse animal model. The method has advantages: the CRISPR / Cas9 gene knockout technology is used and the mouse animal model with the Amy1 gene knocked out is established for the first time; and a convenient and reliable animal model is provided for researching the relationbetween the Amy1 gene and related diseases.

The invention provides a construction method of an Ano5 gene knockout mouse model. A CRISPR-Cas9 gene knockout technology is adopted to remove 11th and 12th exons of the Ano5 gene. After Ano5 gene knockout, mice all have clinical symptoms of human GDD patients such as lateral bending of shin bones, hyperplasia of cortical bone, hypertrophy of lower jawbone, increasing of alkaline phosphatase in blood, and the like. The established mouse model is used to simulate the human GDD disease, is stable, has stable heredity and similar symptoms of the human GDD disease, can be applied to research on GDD pathogenesis and GDD gene therapy, and is economic, simple and reliable.

A corynebacterium acetoacidophilum strain and a method for producing succinic acid therefrom belong to the technical field of bioengineering. The invention discloses a corynebacterium acetoacidophilum strain YF / delta ldh and a method for producing succinic acid therefrom. The corynebacterium acetoacidophilum strain is an ldh (L-lactate dehydrogenase) missing bacterium built by gene knockout technology, is preserved in china center for type culture collection on February 29th, 2012, and encoded as CCTCC NO.M2012041. The strain is high in acid yield, highly resistant to sodions and high in foodsafety, can accumulate succinic acid more than 95g / L by being culture for 48 hours in the anaerobic environment using glucose as substrate and sodium bicarbonate as carbon dioxide donor, and can accumulate succinic acid 136g / L by being cultured for 94 hours.

The invention discloses an MCIR (MelanoCortin 1 Receptor) gene carrier and a construction method thereof. The MCIR gene carrier comprises MC1R-neo and MC1R-GFP (Green Fluorescent Protein), wherein the nucleotide sequence of the MC1R-neo is SEQ ID NO:1, and the nucleotide sequence of the MC1R-GFP is SEQ ID NO:2. A CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) / Cas9 system is adopted to construct an MC1R gene knock-out vector, and only a sgRNA (Ribonucleic Acid) of which the length is about 20bp needs to be designed by aiming at a gene knock-out point to be connected with a universal Cas9 gene. Therefore, compared with traditional gene knock-out technologies including ZFNs (Zinc finger nuclease), TALENs (Transcription Activator-Like Effector Nucleases) and the like, the construction method disclosed by the invention adopting the CRISPR / Cas9 to construct the gene knock-out vector is simpler and more convenient and is more convenient to be further popularized and applied to subsequent experiments.

The invention belongs to the technical field of gene knockout, and discloses a CRISPR Cas9 conditional gene knockout mouse and an establishment method. According to the establishment method, a vectoris designed and constructed, and gRNA and Cas9 protein are prepared; a gRNA sequence and a targeting vector are designed; the targeting vector is constructed by the In-Fusion technology, and the targeting vector is verified by restriction digestion, PCR and sequencing; the gRNA and Cas9 protein are prepared at the same time; microinjection and F0 mouse identification are performed; the obtained Donor vector, gRNA and Cas9 protein are co-injected into a fertilized egg; the fertilized egg after microinjection is returned to the oviduct of a surrogate mouse; PCR and sequencing identification areperformed after a mouse is born, and a positive F0 mouse is obtained; the reproduction and identification of a F1 generation mouse are performed; the sexually mature positive F0 mice are matched withwild-type mice respectively for reproducing the first generation, and a polycystic kidney gene PKD1 knockout mouse is obtained successfully.

The invention relates to a controllable genome-modified plasmodium, a recombinant expression vector and the construction method and application of the controllable genome-modified plasmodium and the recombinant expression vector. The recombinant expression vector comprises a gene targeting long homologous arm, a gene targeting short homologous arm, a tetracycline repression protein gene expression cassette, a pyrimethamine resistance gene expression cassette and a target gene expression cassette, wherein the tetracycline repression protein gene expression cassette, the pyrimethamine resistance gene expression cassette and the target gene expression cassette are located between the gene targeting long homologous arm and the gene targeting short homologous arm, and tetracycline operator gene sequences are inserted in multiple transcriptional start sites of a target gene promoter, so that the recombinant expression vector can be used for conditional research of the functions of a certain functional gene in a plasmodium genome. Furthermore, a functional gene expression sequence, corresponding to a target gene, in the plasmodium genome is knocked out by means of the gene knockout technique; meanwhile, the recombinant expression vector is transfected into a plasmodium with genes knocked out, so that the controllable genome-modified plasmodium is obtained; a new technical scheme is provided for further research of the functions of all functional genes in the plasmodium genome, and application prospects are broad.

The invention discloses application of an OsDSK2a protein or an encoding gene thereof in regulation and control of the resistance of rice to rice blast. The amino acid sequence of the OsDSK2a proteinis shown in SEQ ID NO. 2. The invention, for the first time, proves that the rice DSK2a gene (Os10g0542200) is a functional gene for rice blast infection, and cloning and biological function verification of the gene have important reference significance for studying molecular mechanisms of the resistance of rice to rice blast. The invention provides an Os10g0542200 gene editing vector mediated byCas9. After rice is transformed by the vector, the expression level of Os10g0542200 can be greatly reduced, the susceptibility of the transformed plant to the rice blast is reduced along with the reduction of the expression level, the disease resistance is obviously enhanced, and there is no obvious change in growth state and agronomic traits of a transgenic plant. According to the invention, theCas9-mediated Os10g0542200 gene knockout technology can be applied to genetic engineering breeding of rice, and can be applied to production practice to improve the resistance of rice to the rice blast, so that the rice production safety is guaranteed under the current climatic condition of frequently occured rice diseases.