610 results about "Gene conversion" patented technology

This invention relates to humanized antibodies and antibody preparations produced from transgenic non-human animals. The non-human animals are genetically engineered to contain one or more humanized immunoglobulin loci which are capable of undergoing gene rearrangement and gene conversion in the transgenic non-human animals to produce diversified humanized immunoglobulins. The present invention further relates to novel sequences, recombination vectors and transgenic vectors useful for making these transgenic animals. The humanized antibodies of the present invention have minimal immunogenicity to humans and are appropriate for use in the therapeutic treatment of human subjects.

The present invention provides for the expression of phytase in transgenic plants or plant organs and methods for the production of such plants. DNA expression constructs are provided for the transformation of plants with a gene encoding phytase under the control of regulatory sequences which are capable of directing the expression of phytase. These regulatory sequences include sequences capable of directing transcription in plants, either constitutively, or stage and/or tissue specific, depending on the use of the plant or parts thereof. The transgenic plants and plant organs provided by the present invention may be applied to a variety of industrial processes either directly, e.g. in animal feeds or alternatively, the expressed phytase may be extracted and if desired, purified before application.

The invention discloses a new gene purE1 which has high degradability on quinoline. Experiment shows that by using the purE1 gene to transform a microbe, the microbe can obtain degradation activity on quinoline, and the maximal degradation concentration of the degradation activity of the microbe provided by the purE1 gene and its coded protein is up to 850 mg/L. The invention has very important practical application value for the treatment of quinoline contaminants.

An engineered highly specific DNA-cleavage enzyme delivers a site-specific nick in a double stranded DNA, to cleave one DNA strand within its target site while leaving the opposing DNA strand intact. The engineered enzyme provides the ability to induce a gene conversion event in a mammalian cell. An engineered sequence-specific nickase derived from a LAGLIDADG homing endonuclease is altered by a single amino acid residue, wherein the amino acid residue is involved in the polarization of solvent molecules and acid-base catalysis in the active site without affecting direct contacts between the enzyme and either the bound DNA or bound metal ions. Engineered, site-specific nickase variants, such as of I-AniI and other homing endonucleases, are particularly useful in targeted genome engineering as well as therapeutic, targeted gene repair.

A technique for efficiently introducing a foreign gene into cells with the use of transposons. In particular, a technique for efficiently preparing a transgenic organism with the use of a transposon having its transposition activity strikingly enhanced through methylation of a sequence containing the transposon. The methylation is retained even after incorporation in a genome, and now can be utilized in actual gene incorporation in a genome. This technique can realize strikingly efficient gene transformation as compared with the a method of preparing a transgenic organism with the use of conventional transposons.

Methylotrophic or methanotrophic bacteria such as Methylobacterium are transformed with a gene of interest, and expression of the gene is regulated by means of a cumate repressor protein and an operator sequence which is operatively linked to the gene of interest, and the addition of an external agent. Specifically, the cymR repressor and cmt operator from Pseudomonas putida may serve to regulate gene expression in methylotrophic or methanotrophic bacteria with the addition of cumate.

The invention discloses an OsNCEDs gene relative to drought resistance originating from rice. Coded protein has one of the following amino acid sequences: 1). SEQ ID NO: 1, 3 or 5 in sequence list; 2). The amino acid residue sequence for the SEQ ID NO: 1, 3 or 5 in the sequence list pass through replacing, lacking or adding of one to ten amino acid residue and derived protein has the function of controlling drought resistance of plants. The experiment proves that: the gene conversion rice can obviously improve drought resistance of rice. The invention has the advantages of having an important theory and actual meaning upon research of drought resistance mechanism for plants and improving drought resistance and relative characteristics, playing an important role in drought resistance gene engineering improvement for plants (especially for rice crops) and having wide application prospect.

The invention discloses a group of bZIP genes which are derived from rice and are related with stress tolerance, the encoded protein has one of the following amino acid sequences: 1) the SEQ ID No:1, 3 or 5 in a sequence table; 2) the amino acid residue sequence of the SEQ ID No:1, 3 or 5 in the sequence table is treated with the substitution, deletion or adding of one to ten amino acid residues and the derived protein has the effect of regulating the performance of plant stress tolerance. The experiments proves that the transgenic rice of the invention can improve the tolerance of the rice to high-salt, drought and low-temperature adversity threats and have no apparent impacts on the normal growth and the economic traits of the rice. The protein and the encoded genes of the invention have important theoretical and practical significances on the research of a plant stress tolerance mechanism, the improvement of the plant stress tolerance and the improvement of the related traits, thereby playing an important role in the stress tolerance genetic engineering improvement of plants (more particularly cereal crops) and having broad application prospect.

The present invention relates to transformed plants with an altered terpene content, preferably over-accumulating a mono- or sesqui-terpene. By transformation of plants with genes encoding terpene synthases (TS), and prenyl transferases (PRT), plants accumulating at least 1000 ng/per g of fresh leaf of a specific terpene were obtained. The present invention provides an advantageous system for production of terpenes in that any desired mono- or sesqui-terpene at the choice of the skilled person can be produced in plants. Preferably, the transformed plants contain at least one recombinant plastid targeted TS and PRT.

The invention discloses a method for agrobacterium tumefaciens-mediated genetic transformation of sugarcane. The method comprises the steps: leading agrobacterium tumefaciens liquor carrying plant expression vectors to infect embryogenic callus of the sugarcane; and selecting and proliferating resistant calli to induce the resistant calli to obtain the resistant buds of the sugarcane, wherein matrix attachment region sequences are connected at two sides of a gene expression box of the plant expression vector. According to the method, MARs (metal artifact reduction) sequences are built at two sides of the gene expression box of the plant expression vector, thus greatly improving the exogenous gene transformation efficiency and seedling rate of the sugarcane, and being simple in process flow and low in cost.

The subject invention provides novel polynucleotides and polypeptides encoding a methyltransferase. The subject invention provides novel plants that express the methyltrasferase disclosed herein and are resistant to auxin-based herbicides. The subject invention also provides transgenic plants have been transformed with one or more other herbicide resistance genes such that the plants are resistant to the application of auxin-based herbicides and one or more other herbicides.

L-cysteine is produced by culturing a coryneform bacterium in which intracellular serine acetyltransferase activity is increased by transformation with a gene coding for serine acetyltransferase, such modification of an expression control sequence of a gene coding for serine acetyltransferase that expression of the gene in a cell should be enhanced and for forth, preferably in which L-cysteine decomposition system is further suppressed, in a medium to produce and accumulate L-cysteine in culture and collecting the L-cysteine from the culture.

The present invention relates to the isolation, purification, characterization and use of the plant diacylglycerol acyltransferase (DGAT) gene and genetic products. The invention includes isolated and purified DGAT DNA and relates to methods of regulating seed oil content, the ratio of diacylglycerol/triacylglycerol proportions in the seed oil, fatty acid synthesis, seed oil acyl composition, seed size/weight and carbon flux into other seed components, using the gene, and to tissues and plants transformed with the gene. The invention also relates to transgenic plants, plant tissues and plant seeds having a genome containing an introduced DNA sequence of the invention, and a method of producing such plants and plant seeds.

The present invention relates to production of alkaloids from poppy plants and in particular togenes encoding enzymes in the alkaloid pathway, to proteins encoded by the gens, to plants transformed or transfected with the genes and to methods of altering alkaloid content or blend of poppy plants.

The invention discloses a group of HAP3 genes which are derived from rice and are related with stress tolerance, the encoded protein has one of the following amino acid sequences: 1) the SEQ ID No:1, 3 or 5 in a sequence table; 2) the amino acid residue sequence of the SEQ ID No.:1, 3 or 5 in the sequence table is treated with the substitutes, deletes or adds of one to ten amino acid residues and the derived protein has the effect of regulating the performance of plant stress tolerance. The experiments proves that the transgenic rice of the invention can improve the tolerance of the rice to the high-salt, drought and low-temperature adversity threats and have no apparent impacts on the normal growth and the economic traits of the rice. The protein and the encoded genes of the invention have important theoretical and practical significances on the research of a plant stress tolerance mechanism, the improvement of the plant stress tolerance and the improvement of the related traits, thereby playing an important role in the stress tolerance genetic engineering improvement of plants (particularly cereal crops) and having broad application prospect.

The invention relates to a modified lymphoid cell having gene conversion fully or partially replaced by hypermutation, wherein said cell has no deleterious mutations in genes encoding paralogues and analogues of the RAD51 protein, and wherein said cell is capable of directed and selective genetic diversification of a target nucleic acid by hypermutation or a combination of hypermutation and gene conversion. The invention also relates to a method for diversifying any transgenic target gene in said cell. Preferably, the target gene is integrated into the immunoglobulin light or heavy chain locus by targeted integration.

The invention provides an artificially synthesized Bt insecticidal gene FLIa as well as a preparation method and application thereof, belonging to the technical field of insecticidal protein and biosafety. The nucleotide sequence of the Bt insecticidal gene FLIa is shown as SEQ ID NO: 1, and the nucleotide sequence of encoded protein of the Bt insecticidal gene FLIa is shown as SEQ ID NO: 2 in a sequence table. The preparation method of the Bt insecticidal gene FLIa comprises the steps of exchanging and fusing Domain I and Domain II of a insecticidal gene CrylAb and Domian III of a insecticidal gene CrylIa to obtain a recombinant insecticidal gene MCrylI; on the basis of the recombinant insecticidal gene MCrylI, connecting the carbon terminal of a insecticidal gene CrylJal at a 3minute terminal to obtain a recombinant insecticidal gene FLMCrylIa; performing codon reconstruction on the recombinant insecticidal gene FLMCrylIa to obtain the Bt insecticidal gene FLIa. The Bt insecticidal gene FLIa can be stably inherited and expressed in transformation plants, and is high in expression quantity, and obtained transgenic plants are good in insect resistance. The gene is used for transforming crops of corn, cotton, rice, vegetables and the like, and enabling the same to have corresponding insect-resistant activity, so that the using amount of pesticides is reduced and environment pollution and production cost are reduced.

The present invention provides a novel dominant selectable marker system in yeast that is based on an aminoglycoside, nourseothricin (NST). This compound possesses a powerful antifungal activity against Candida albicans and S. cerevisiae. The invention provides a cognate drug resistance marker for use in gene transformation and disruption experimentation in Candida albicans and Saccharomyces cerevisiae. In particular, the invention presents: 1) direct utility for gene manipulations in both clinically and experimentally relevant strains regardless of genotype and without affecting growth rate, or hyphal formation; and 2) applicability to antifungal drug discovery, including target validation and various forms of drug screening assays.

Most microalgae are obligate photoautotrophs and their growth is strictly dependent on the generation of photosynthetically-derived energy. In this study it is shown that the microalga Phaeodaclylurn tricornutum can be engineered to import glucose and grow in the dark through the introduction of genes encoding glucose transporters. Both the human and Chlorella kessleri glucose transporters facilitated the uptake of glucose by P. tricornutum, allowing the cells to metabolize exogenous organic carbon and thrive, independent of light. This is the first successful trophic conversion of an obligate photoautotroph through metabolic engineering, and it demonstrates that methods of cell nourishment can be fundamentally altered with the introduction of a single gene. Since strains transformed with the glucose transport genes are able to grow non-photosynthetically, they can be exploited for the analysis of photosynthetic processes through mutant generation and characterization. Finally, this work also represents critical progress toward large-scale commercial exploitation of obligate phototrophic algae through the use of microbial fermentation technology, eliminating significant limitations resulting from light-dependent growth.