31results about How to "Lower preference" patented technology

The present invention discloses a method for modulating the quality of a selected phenotype that is displayed by an organism or part thereof and that results from the expression of a polypeptide-encoding polynucleotide by replacing at least one codon of that polynucleotide with a synonymous codon that has a higher or lower preference of usage by the organism or part thereof to produce the selected phenotype than the codon it replaces. The present invention is also directed to the use of a codon-modified polynucleotide so constructed for modulating the quality of a selected phenotype displayed by an organism or part thereof.

The present invention discloses methods and compositions for modulating the quality of an immune response to a target antigen in a mammal, which response results from the expression of a polynucleotide that encodes at least a portion of the target antigen, wherein the quality is modulated by replacing at least one codon of the polynucleotide with a synonymous codon that has a higher or lower preference of usage by the mammal to confer the immune response than the codon it replaces.

The invention provides a DNA amplification method. The DNA amplification method is characterized by comprising the step that a T7 promoter sequence is added to the target DNA tail end. According to the DNA amplification method, amplification can be conducted on DNA smaller than one nanogram or even a single cell genome DNA on the basis of trace DNA; relatively even amplification is achieved through the target DNA containing the T7 promoter sequence; an error produced in the amplification process can be effectively removed.

The invention discloses a linker sequence and method for detecting the ultra-low frequency mutation of a target sequence. According to the method, a certain number of labeled molecules can be obtained by conducting terminal repair, A adding, linker connection, fragment enrichment, capture and the like on an interrupted genome or cfDNA, then on-machine sequencing is conducted, positive and negative chains are corrected by means of a later-period biological analysis method, and real mutation information is obtained through analysis.

The present invention discloses a specific recognition sequence based T cell receptor high-throughput sequencing library construction and sequencing data analysis method. According to the method, a specific reverse transcription primer is designed for an mRNA sequence of a C region of a TCR constant region, cDNA is obtained by reverse transcription, and the 3' end of the cDNA is connected with a library construction linker with a specific recognition sequence; then the linker with the specific recognition sequence is added by using a splint connection method, and a TCR gene rearrangement sequence is amplified under the action of DNA polymerase by utilizing a gene specific primer with a tag; and finally a DNA library is added with a sequencing linker by PCR amplification to prepare a high-throughput sequencing library, and the high-throughput sequencing library is used for sequencing. The TCR gene diversity is comprehensively analyzed by bioinformatics, and a rearrangement rule of TCR genes including J region, D region and V region genes can be accurately obtained. The method is high in library construction efficiency, few in library construction step, low in required RNA initial quantity and low in library construction cost.

The present invention discloses methods and compositions for modulating the quality of an immune response to a target antigen in a mammal, which response results from the expression of a polynucleotide that encodes at least a portion of the target antigen, wherein the quality is modulated by replacing at least one codon of the polynucleotide with a synonymous codon that has a higher or lower preference of usage by the mammal to confer the immune response than the codon it replaces.

The invention provides a sebastiscus marmoratus gene screening and mining method based on a simplified genome sequencing technology, and belongs to the technical field of molecular marker development. The method comprises steps as follows: genome DNA extraction; genome DNA double digestion; linkage connection; PCR (polymerase chain reaction) amplification; sequence fragment recovery and high-throughput sequencing; data analysis and screening and gene locus mining. According to the method, extracted DNA has higher quality, enzyme cleavage rate is effectively increased, primer design difficulty is reduced, recovered fragments have more uniform size, the sequencing amount is larger, and a sequencing result is more accurate; areas such as a high-repetition area and the like with relatively higher methylation degree can be avoided, so that enzyme cleavage fragments with more specific sequences are collected, and marking effectiveness of SNPs (single nucleotide polymorphisms) for following identification is higher; obtained nucleic acid molecules have quite low preference and high complexity, and therefore, the maximum gene coverage is obtained with the least sequencing data during sequencing.

The invention belongs to the technical field of biology, and particularly discloses a construction method of a single cell transcriptome sequencing library and applications thereof. The method comprises the following steps: splitting sorted single cells in a pore plate, and carrying out reverse transcription by using a reverse transcription primer to synthesize a first chain cDNA; synthesizing a second chain cDNA through a replacement synthesis reaction; carrying out fragmentation on the double-chain cDNA by using Tn5 transposase; enriching a fragmented template by using PCR; and labeling the enriched fragment by using Index PCR, and performing purification to obtain the single cell transcriptome sequencing library. The Tn5 transposase is used for directly performing enzyme digestion on the double-stranded cDNA, and PCR pre-amplification on the cDNA is not needed, so that the library preference can be reduced, and more accurate transcriptome information can be obtained; and meanwhile, by using the Tn5 transposase, the library establishment efficiency can be improved, and the library establishment time can be shortened. The method is simple in library establishment steps, more genes can be detected, and the proportion of low and medium abundance gene dropout is effectively reduced. Therefore, library establishment time and costs are reduced, and more detailed research on the single cell level is facilitated.

The present invention relates to the field of bioinformatics, and specifically provides a method for constructing a low-initial-quantity PCR-free high-throughput sequencing library. The method includes the following steps: (1) extracting cfDNA from plasma, carrying out terminal repair and 5' terminal phosphorylation, and purifying and recovering terminal repair products with magnetic beads; (2) adding "A" bases to 3' terminal of the purified terminal repair products to be integrated into one system with a joint connection system, and carrying out a reaction; and (3) purifying joint products with magnetic beads to obtain the sequencing library. The constructing method has the advantages of low cost, short time-consuming, no need of PCR amplification for library construction, maintained stable data output and low requirements for the initial DNA quantity. Only 1-2ng of cfDNA can meet the needs of library construction, and the method can be used for effective sequencing, and has very broad application prospects in high-throughput sequencing, non-invasive diagnosis and other research.

A group decision support server includes a project creation unit configured to register a first group of drafts including at least one or more draft and create a project for evaluating the drafts; a first evaluation configured to yield a first evaluation result based on evaluation information of a first preference base inputted from the participant when the participant participates in the project; a second evaluation unit configured to select a final draft that has the most favorable evaluation based on the first evaluation result and an evaluation information of a second weighted value base inputted from the participant.

The invention discloses a method for constructing a whole genome high-throughput sequencing library. The method comprises the following steps: 1) extracting a sample gDNA; 2) carrying out enzyme digestion fragmentation on the sample gDNA, filling in the tail end, and adding A to obtain gDNA added with A; 3) connecting the gDNA added with A with a linker combination to obtain a connection product,the linker combination comprising two parts: a Y-shaped reverse linker and a high GC splint linker; 4) purifying the connection product to obtain a purified product, and 5) performing fragment screening on the purified product to obtain the sequencing library. The invention also discloses a kit for constructing the whole genome high-throughput sequencing library.

The invention discloses a carbon catabolism regulation protein CcpA mutant I42A, and belongs to the technical field of protein engineering. A CcpA gene cloned from a bacillus licheniformis genome is mutated to obtain a carbon catabolism regulation protein CcpA mutant I42A, wherein the amino acid sequence of the mutant I42A is as shown in SEQ ID NO.2, and the nucleotide sequence of the gene for encoding the mutant I42A is as shown in SEQ ID NO.1. According to the invention, a recombinant expression vector containing the CcpA mutant I42A gene is constructed, and the constructed expression vectoris transformed into a bacillus licheniformis CcpA gene defective strain to obtain recombinant bacillus licheniformis. The obtained recombinant bacillus licheniformis can obviously change the carbon catabolism repression phenomenon caused by the existence of glucose, and can reduce the preference of bacillus licheniformis to xylose.

The invention discloses a carbon catabolism regulatory protein CcpA mutant K31A, and belongs to the technical field of protein engineering. A CcpA gene cloned from a bacillus licheniformis genome is mutated to obtain the carbon catabolism regulatory protein CcpA mutant K31A, the amino acid sequence of the carbon catabolism regulatory protein CcpA mutant K31A is shown as SEQ ID NO.2, and the nucleotide sequence of the gene encoding the carbon catabolism regulatory protein CcpA mutant K31A is shown as SEQ ID NO. 1. A recombinant expression vector containing the gene encoding the CcpA mutant K31Ais constructed, and the constructed expression vector is transformed into a bacillus licheniformis CcpA gene defect strain to obtain recombinant bacillus licheniformis. The obtained recombinant bacillus licheniformis can obviously change the carbon catabolism repression phenomenon caused by the existence of glucose, and the preference of the bacillus licheniformis to xylose can be reduced.

The invention provides a method for constructing a prokaryote RNA sequencing library. According to the method, an extension sequence can be added to prokaryote mRNA, and prokaryote RNA can be efficiently called and reversely transcribed by using the extension sequence; meanwhile, according to the method, a molecular tag can be marked for each prokaryote original mRNA molecule, so that the influence of PCR preference on the detection accuracy is avoided, and a prokaryote mRNA sequencing library with low preference and high accuracy is obtained. Compared with a traditional prokaryote RNA sequencing library construction method, the method has the advantages that the constructed library is low in preference, meanwhile, the method is easy and convenient to operate, the success rate is high, and the method is also suitable for detection of samples with extremely low initial quantity (smaller than 2ng total RNA).

The invention belongs to the technical field of single nucleotide polymorphism upper detection, and discloses a multi-task high-order SNP upper detection method and a system, a storage medium and equipment. The multi-task high-order SNP upper detection method comprises the following steps: reading PED and MAP format data from a VCF file by using Plink software, converting a bit binary format file,and arranging the bit binary format file into a sample matrix; setting search algorithm parameters according to the sizes of the SNP sites and the sample size in the data; reading in SNP sample data,and preparing first-stage search; carrying out high-order SNP upper combination detection by utilizing a multi-task and multi-harmony memory bank harmony search (HS) algorithm. According to the multi-task harmony search detection method provided by the invention, a plurality of harmony memory banks are adopted, SNP combinations of different orders are respectively stored, and a multi-task technology is applied, so that high-order SNP upper detection of a plurality of different orders can be carried out at the same time, mutual learning among individuals in a population is promoted, the diversity of the population is enhanced, and the global search capability is further improved.