46 results about "Low copy number" patented technology

Provided herein are products and processes for the amplification, detection and sequencing of short-stranded nucleic acid in the presence of a high background of long-stranded genomic material (e.g., host or maternal nucleic acids). The methods rely on the use of inside and outside primers introduced at varying concentrations, as well as universal amplification reactions that preferentially amplify short, low copy number nucleic acid.

Methods of preparing nucleic acid templates and providing the nucleic acid templates to low copy number reaction volumes are provided. Related compositions of nucleic acid templates are also provided.

The invention provides a preparation method of glyphosate resistant transgenic rice. The method comprises the following steps: converting an expression vector containing glyphosate resistant gene into Agrobacterium tumefaciens, invading rice calluses by the Agrobacterium tumefaciens, transferring the calluses to a selective aluminum containing glyphosate for screening, choosing resistant calluses, differentiating, rooting, hardening-seedling, and transplanting to obtain glyphosate resistant transgenic rice. A molecular identification result shows that an exogenous gene is stably expressed. The obtained glyphosate resistant transgenic rice contains glyphosate herbicide resistant gene, contains no other screening marker genes, and can be used as a commercial herbicide resistant rice kind to reduce the reduce the later process and accelerate the breeding pace. The method has the advantages of simple operation, low copy number of transgenic plants, stable heredity properties, and good market application prospect.

Compositions and methods for the efficient transformation and regeneration of monocot plants are provided. The methods of transformation involve infection with Agrobacterium. In this manner, any gene of interest can be introduced into the monocot plant with high transformation efficiency and in low copy number. Transformed and regenerated monocot cells, tissues, plants, and seed are also provided. The invention encompasses regenerating transformed plants, transgenic seeds produced therefrom, and transgenic plants and transgenic seeds from subsequent generations.

This invention provides a series of low-copy number plasmids comprising restriction endonuclease recognition sites useful for cloning at least three different genes or operons, each flanked by a terminator sequence, the plasmids containing variants of glucose isomerase promoters for varying levels of protein expression. The materials and methods are useful for genetic engineering in microorganisms, especially where multiple genetic insertions are sought.

The present invention is internal standard gene suitable for quantitative and qualitative PCR detection of foreign gene of transgenic cotton, tomato, rice and rape and copy number analysis and its application. Based on the intraspecific non-specificity, interspecific specificity, monocopy or low copy number, and through bioinformatical analysis and biological experiment, four internal standard genes, including cotton SADI, tomato LAT52, rice SPS and rape HMGI/Y gene are found out separately in cotton, tomato, rice and rape. The detection sensitivity and precision of these internal standard genes are experiment proved in PCR method. At the same time, the quantitative and qualitative PCR detection systems for foreign gene of transgenic cotton, tomato, rice and rape are established separately based on these internal standard genes, and corresponding PCR detection and analysis platforms are established.

The invention discloses a CA16 infectious clone with a green fluorescent protein gene as well as a construction method and an application of the CA16 infectious clone. The method comprises the steps of firstly, inserting full-length cDNA (complementary deoxyribonucleic acid) of a CA16/GD09/24 virus strain by taking a low copy number plasmid pACYC177 as a carrier; then, inserting an eGFP (enhanced green fluorescent protein) reporter gene and adding a 2A protease cleavage site (AITTL) between 5'UTR and VP4 by taking the full-length infectious clone as a skeleton so as to obtain a full-length infectious clone of the CA16 with the eGFP reporter gene. The CA16 infectious clone with the green fluorescent protein gene, constructed by the method, disclosed by the invention, can be used for saving an eGFP-CA16 reporter virus of which the growth tendency is similar to that of a recombinant CA16 virus and a parent CA16, and can also be used for screening antiviral drugs, thereby providing a convenient platform for deepening virus replication and pathogenesis researches and laying a solid foundation for screening and developing novel vaccines in future.

The invention relates to the biotechnical field, and concretely relates to an HSV1-H129-BAC and a mutant thereof. The above virus and the mutant thereof carry a bacterial artificial chromosome (BAC), can keep low-copy number self-replication in specific bacteria, and solve the disadvantages of unable long-term preservation, unable self-replication and inconvenient molecular biologic mutation reconstruction due to too large herpes virus genomes. The virus and the mutant thereof also carry a GFP reporter gene, and substantially develop the application prospect of the herpes virus as a tool virus. The invention also provides a construction method of the H129-BAC and the mutant thereof. The method allows H129 to be reconstructed in order to obtain H129-BAC and endows the H129-BAC with more mutant types; and the construction method, the H129 and the mutant thereof form a genetic modification platform with high application possibility.

The invention relates to a pTerm-SC plasmid as well as a construction method and application thereof. The pTerm-SC plasmid comprises a repE gene, a sopA gene, a sopB gene, a sopC gene, an ori2 replicon, an oriV replicon, prokaryote transcription terminators and antibiotics resistance genes. The pTerm-SC plasmid has the characteristics of very low copy number, high volume and stability and the like, can be applied to gene engineering fields such as the cloning, the screening, sequencing and the genome construction of complex-structure genes including repetitive-sequence genes, instable genes and long-fragment genes and has important role in the high-efficiency and high-quality synthesis of genes.

The invention discloses a one-step droplet digital PCR method for quantitatively detecting the GII type norovirus in fruits and vegetables. According to the method, RT-ddPCR is utilized, a primer and a probe for RT-qPCR detection of the GII type norovirus are combined for use, reaction is carried out, and then the high-sensitivity rapid detection for the GII type norovirus is realized. The method is high in sensitivity and can achieve about 2copies/[mu] L, but the sensitivity of the conventional RT-qPCR is usually 10 copies/[mu] L; the amplification efficiency is high, the amplification efficiency is 95.4%, R2 is equal to 0.9973. Under low copy number, compared with RT-qPCR, the method provided by the invention can more effectively avoid the influences of inhibitors in fruits and vegetables, and the false negative generation is reduced. Therefore, the detection method provided by the invention is sensitive, accurate and visual, a novel detection method is provided for the government departments including the agriculture department and the inspection and quarantine bureau, and related detection mechanisms and enterprises, and guiding significance is also achieved.

A single embedded polyhedronvirus shuttle expression carrier of bollworm is configured through inserting the low-copy bacterium F replicon, kanamycine resistant gene and beta galactosidase gene to the polyhedrom gene site of the virus genom. The doner plasmid is used to transfer the exogenous gene to the insetion site of transposon in the said shuttle expression carrier. After bollworm cell is transfected by said DNA, the infections recombinant virus particles are formed to express exogenous gene under control of polyhedron promoter and P10 promoter.

The invention relates to the technical field of organisms, and particularly relates to a kit and an extraction method for extracting micro ribonucleic acid (RNA). The kit comprises a box body, a reagent bottle containing first magnetic bead liquid, a reagent bottle containing second magnetic bead liquid, a reagent bottle containing lysate, a reagent bottle containing an eluent, and a reagent bottle containing a scrubbing solution, wherein a foam pad is arranged on the inner bottom wall of the box body; the edge of the foam pad is attached to the inner lateral wall of the box body; five grooves are arranged on the foam pad; one reagent bottle is respectively arranged inside each groove; the first magnetic bead liquid contains a plurality of first magnetic beads, and a targeting sequence or a random sequence capable of being paired with the micro RNA is modified on the surface of each magnetic bead; the second magnetic bead liquid contains a plurality of second magnetic beads, and a hydrophilic high-molecular polymer with negative charge is modified on the surface of each magnetic bead. By adopting the kit disclosed by the invention, the micro RNA in plasma or serum can be more efficiently extracted, and the kit is especially applicable to extraction of the micro RNA with low content or low copy number in a plasma or serum sample.

The invention relates to a method and device for jointly detecting SNV, CNV and FUSEON variations. More specifically, the device comprises a sequencing data reading module, an SNV detection module, a CNV detection module, a FUSEON variation detection module and a result output module, wherein the CNV detection module comprises a BAF calculation module, a BAF correction module, a BAF separation and identification module, a sequencing depth calculation module, a logR correction module, a logR background noise calculation module and a CNV judgment module. The method and device, based on BAF+logR information, detect the SNV, CNV and FUSEON variations in a sample with an extremely low ctDNA proportion, especially the CNV variation with low copy number amplification, with high sensitivity and high specificity.

The cMethDNA method of the present invention is a novel modification of the QM-MSP method (U.S. Pat. No. 8,062,849), specifically intended to quantitatively detect tumor DNA (or other circulating DNAs) in fluids such as serum or plasma at the lowest copy number yet reported. Unique compared to any other PCR-based assay, a small number of copies of a synthetic polynucleotide standard (STDgene) is added to an aliquot of patient serum. In a standard procedure, a cocktail of standards for a plurality of genes of interest (TARGETgene) is added to a sample of serum. Once total DNA is purified and processed, a PCR (multiplex step) is performed wherein the STDgene and the TARGETgene are co-amplified with the same external primer set. In the N second nested PCR step, amplicons present in a dilution of the first PCR reaction are subjected to real time PCR, and quantified for each gene in one well by two-color real-time PCR. Products are calculated by absolute quantitation with internal primer sets specific for the methylated TARGETgene and associated STDgene. Methods of making the STDgene standards and the use of the cMethDNA methods and kits containing the same are disclosed.

The invention relates to a primer composition used for detecting a genome target zone and application thereof and in particular relates to a primer composition for detecting EGFR (Epidermal Growth Factor Receptor) mutation sites of lung cancer by virtue of free plasma DNA and digital PCR (Polymerase Chain Reaction), as well as a detection kit and application thereof. The primer composition disclosed by the invention corresponds to the same template zone, the effect is achieved in the same amplified reaction, the amplification efficiency can be improved on premise of ensuring the specific amplification, and the primer composition is applicable to amplification of short fragment templates with low copy number. Moreover, the primer composition has high sensitivity, is capable of detecting 23 hotspot low frequency mutations of EGFR genes, has low sample amount, is applicable to plasma and other liquid samples, and is excellent in detection result and capable of taking complete genes into account.