99 results about "DNA repair" patented technology

The invention discloses a specie limitation-free eucaryote gene targeting method having no bio-safety influence and a helical-structure DNA sequence, and belongs to the field of gene engineering. The specie limitation-free eucaryote gene targeting method comprises the following steps of 1, designing and constructing CRISPR/Cas9 and chimeric RNA, and 2, carrying out Cas9mRNA internal translation so that Cas9 nuclease and the chimeric RNA are bonded, carrying out fixed point clipping so that DNA double-chain cleavage is realized after the clipping, and introducing an exogenous DNA by induction of a natural DNA restoration process which is a non-homologous end bonding process of cells so that cell endogenous gene modification is realized. The specie limitation-free eucaryote gene targeting method has simple processes, realizes flexible site recognition and has low energy consumption.

The invention discloses a method for acquiring an aromatic rice strain by targeting a Badh2 gene via CRISPR/Cas9 gene editing technology. The method comprises the following steps: separately targeting sequences, recognizable by Cas9, of every exon and intron of an aromatic gene by using the CRISPR/Cas9 gene editing technology and then cutting a genomic DNA sequence to initiate DNA restoration so as to obtain an afunctional Badh2 gene; with the callus of Indica rice, japonica rice or glutinous rice as a receptor material of genetic transformation and an mature embryo, young ear, ovary or the like as explant, carrying out induction so as to obtain a diploid callus, introducing a targeting vector into cells of the callus by using an Agrobacterium mediated transformation method, screening and identifying positive plants and separating the plants from a T1 colony so as to obtain an aromatic rice strain; and with anther, pollen, unfertilized ovary or the like as explant, carrying out induction so as to obtain a haploid callus, introducing the targeting vector into cells of the callus by using the Agrobacterium mediated transformation method, screening a positive callus, reduplicating the positive callus by using colchicine, carrying out differentiation to form seedlings and identifying genetic transformation positive plants so as to eventually obtain the aromatic rice strain.

Disclosed is an anti solid tumor medicine composition, which comprises medicinal adjuvant and DNA restoring enzyme inhibitor and/or Nitrosoureas anti-cancer drugs, wherein the DAN restoring enzyme inhibitor is selected from methoxamine, hydroxylamine and their analogues, which can effectively destroy the DNA restoring function in the tumor cells, and lower the survivability of tumor cell to Semustine anti-cancer drugs and their analogues, the medicinal adjuvant is biological compactable, degradable and absorbing macromolecular polymer, which can slowly release the DNA restoring enzyme inhibitor onto tumor partially during the degradation and absorption process, thus the whole body toxicity reaction is reduced appreciably , and the effective medicinal concentration can be sustained to the tumor partially. By dispensing the composition to the tumor partially, the whole body toxicity reaction of Nitrosoureas anti-cancer drugs and/or DNA restoring enzyme inhibitor can be lowered, selectively increase the tumor local medicinal concentration, and the treatment effect of the non-operative treatment methods such as chemotherapy, medicament and radiation can be improved.

An anticancer in vivo implant applied locally is prepared from the anticancer nitrosourea-type medicine, the anticancer synergist chosen from nitrogen mustard compound, mitotic inhibitor and antimetabolic anticancer medicine, and the biocompatible and biodegradable high-molecular polymer as medicinal additive.

Disclosed is an anti-cancer drugs slow release agent containing Epothilone which comprises slow release microspheres and dissolvent, wherein the slow release microballoons comprise anti-cancer active constituents and slow release auxiliary materials, the dissolvent being specific dissolvent containing suspension adjuvant. The anticancer active constituents include Epothilone, Epothilone derivatives, Epothilone B, Epothilone D and combination of anti-cancer drugs selected from phosphoinositide-3-kinase inhibitor, of pyrimidine analogues and/or DNA restoring enzyme inhibitor, the slow release auxiliary materials include polylactic acid and its copolymer, polyethylene glycol, PLA-COOH copolymer, di-aliphatic acid and sebacylic acid copolymer, poly(erucic aciddipolymer-sebacylic acid), poly(fumaric acid-sebacylic acid), Polifeprosan, polylactic acid and other biocompatible high polymers, the viscosity of the suspension adjuvant is 100-3000cp (at 20-30 deg C), and is selected from sodium carboxymethylcellulose. The anticancer active constituents and the slow release microspheres can also be prepared into slow release implanting agent for intra-tumor or around-tumor injection or placement for the effective suppression of tumor growth and for the appreciable enhancement for curative effects of non-operative treatments such as chemotherapy.

The slow released anticancer injection containing methotrexate and its synergist consists of slow released microballoon and solvent. The slow released microballoon includes effective anticancer component and slow releasing supplementary material, and the solvent is common solvent or special solvent containing suspending agent. The effective anticancer component is methotrexate synergist or the composition of methotrexate and its synergist; the methotrexate synergist is selected from phosphorinositide 3-kinase (PI3K) inhibitor, pyrimidine analogue and DNA repair enzyme inhibitor; the slow releasing supplementary material is PLA, PLGA, EVAc, etc or their composition; and the suspending agent is sodium carboxymethyl cellulose, etc. The slow released microballoon may be also prepared into slow released implantation preparation. Implanting or injecting the slow released preparation to local tumor part can lower the systematic toxic reaction of the medicine and raise the medicine concentration of local tumor part selectively to raise the treating effect.

The invention discloses a second-generation sequencing method for dimolecular self-checking library preparation and hybrid capture used for trace DNA ultralow frequency mutation detection. The methodcomprises the following steps: extracting plasma free DNA, performing DNA chemical error repair, preparing a self-checking dimolecular identification code hairpin type joint, repairing plasma free DNA, connecting DNA with the joint, and performing Pre-PCR amplification, excessive hybrid capture, Post-PCR amplification, computer sequencing, data error correction, and mutation analysis and annotation. The method disclosed by the invention can efficiently realize low frequency mutation detection of plasma free DNA. DNA error repair and dual redundancy checking technology can enable the method tohave ultralow false positive rate and high sensitity while detecting trace samples, thus avoiding defects of existing plasma circulating free DNA detection methods, not only realizing cancer mutationdetection and targeted medication guidance, but also realizing early screening of genetic and birth defects of fetus.

The present invention relates to methods for decreasing cellular DNA repair in a patient diagnosed with or suspected to have chronic lymphocytic leukemia (CLL); decreasing cellular NAD⁺ biosynthesis in a patient diagnosed with or suspected to have CLL; or sensitizing a patient diagnosed with or suspected to have CLL to a DNA damaging therapy. The invention relates to methods for treating a patient diagnosed with or suspected to have CLL.

A topical composition for anti-aging and anti-UV damage treatment of the skin includes water soluble extract of Uncaria species, Arabidopsis thaliana extract, alpha lipoic acid, dimethylethanolamine, tetrahexyldecyl ascorbate, dimethyl sulfoxide, Glycyrrhiza Glabra (licorice) root extract, methylsulfonylmethane, phytosterols, D-ribose, tocotrienol, tocopherol, glucosamine hydrochloride, Pisum sativum extract; silicates of sodium, magnesium and aluminum, and a dermatologically acceptable liposomal delivery medium. The composition is useful in a method using it for anti-aging skin treatment effecting DNA repair in both the nucleus and the mitochondria. The topical composition can be applied on the skin of a person daily, and can also be applied in a dermal infusion treatment, with or without micro-dermal abrasion or skin suction. Topical application of the composition achieves effective reduction of pigmentation spots, degree of winkles, and improvement of skin color, tone and turgidity, particularly of the eyelid and facial areas.

A slowly-releasing anticanser composite medicine implanted in human body is composed of the anticancer medicine prepared from implantation agent, slowly releasing agent and dichloroethane-kind medicine for suppressing the growth of tumor cells and the medicinal additive chosen from biocompatible and biodegradable polymer for slowly releasing said anticancer medicine toward tumor.

An anticancer in vivo implant applied locally is prepared from the anticancer nitrosourea-type medicine, the anticancer synergist chosen from Pt compound, anticancer taxol, medicine and vegetative alkaloid, and the biocompatible and biodegradable high-molecular polymer as medicinal additive.

The invention discloses application of rabdocetsin in preparing a product for inhibiting proliferation of esophageal squamous carcinoma cells. Proofed by experiment, the application has the advantages that the rabdocetsin can effectively inhibit the proliferation of the esophageal squamous carcinoma cells, the cloning formation of the esophageal squamous carcinoma cells, affecting the cycle progress of the esophageal squamous carcinoma cells, inducing the retardation of the cycle of the esophageal squamous carcinoma cells, inhibiting the DNA (deoxyribonucleic acid) restoration of the esophageal squamous carcinoma cells, inducing the withering of the esophageal squamous carcinoma cells, regulating up the expression amount of cleaved-caspase-9, regulating up the expression amount of cleaved-caspase-3, regulating up the expression amount of cleaved-PARP, inhibiting Akt signal pathways, inhibiting NF-kappa B signal pathways, and inhibiting the growth of tumors caused by the esophageal squamous carcinoma cells; the important application value is realized.

Provided is a method for conducting site-specific modification in a plant through gene transient expression, comprising the following steps: transiently expressing a sequence-specific nuclease specific to the target fragment in the cell or tissue of the plant of interest, wherein the sequence-specific nuclease is specific to the target site and the target site is cleaved by the nuclease, thereby the site-specific modification of the target site is achieved through DNA repairing of the plant.

Embodiments of the invention provide systems, methods, and kits for CRISPR-based editing of DNA targets by a CRISPR-associated (Cas) enzyme. The systems include a bacterial host cell adapted to produce an engineered bacteriophage comprising a Cas protein and guide RNA that do not naturally occur together, i.e. they are engineered to occur together, as well as a DNA repair template comprising a donor DNA having a desired mutation. The guide RNA comprises a trans-activating crRNA and a guide sequence complementary to a target protospacer in a bacteriophage genome. A wild-type bacteriophage or a glucosylhydroxymethyl cytosine (ghmC)-unmodified mutant bacteriophage may be delivered into a disclosed bacterial host cell to create recombinants of bacteriophage having the desired mutation provided by the donor DNA.

The invention relates to an anti-cancer drug slow release injection containing gemcitabine, which comprises slow release microspheres and a menstruum, wherein the microsphere comprises anti-cancer active ingredients and slow release auxiliary materials, and the menstruum is a special menstruum containing a suspending agent; the anti-cancer active ingredients are gemcitabine, or antimetabolites selected from zalcitabine, emtricitabine, galocitabine, ibacitabine, ancitabine, decitabine, flurocitabine, enocitabine, imidazole gemcitabine, capecitabine, gemcitabine, fludarabine or cladribine, and/or antimetabolite potentiating agents selected from phosphoinositide 3-kinase inhibitor, pyrimidine analogue and/or DNA repair enzyme inhibitor; the slow release auxiliary materials are polifeprosan, dienoic fatty acid, decanedioic acid copolymer, polylactic acid copolymer, EVAc and the like; the suspending agent has a viscosity of 100cp-3000cp (20-30 DEG C), and is selected from sodium carboxymethylcellulose and the like. The slow release microspheres can be prepared into slow release implants. When injected or placed into tumors or at peripheries of tumors, the slow release microspheres can enhance the treatment effect of non-operative treatment methods, such as radiotherapy, chemotherapy, etc.

A slow-release anticancer injection contains the slow-release microspheres and solvent. Said slow-release microsphere contains the active anticancer component chosen from 6 Pt compounds including bicycloplatinum, etc and 3 cytotoxins including phosphoinositide 3-kinase inhibitor, pyrimidine analog or DNA repairase inhibitor, and the slow-release auxiliary.