54 results about "Phylogenetic relationship" patented technology

The present invention relates to methods and algorithms that can be used to identify sequence motifs that are either under- or over-represented in a given nucleotide sequence as compared to the frequency of those sequences that would be expected to occur by chance, or that are either under- or over-represented as compared to the frequency of those sequences that occur in other nucleotide sequences, and to methods of scoring sequences based on the occurrence of these sequence motifs. Such sequence motifs may be biologically significant, for example they may constitute transcription factor binding sites, mRNA stability/instability signals, epigenetic signals, and the like. The methods of the invention can also be used, inter alia, to classify sequences or organisms in terms of their phylogenetic relationships, or to identify the likely host of a pathogenic organism. The methods of the present invention can also be used to optimize expression of proteins.

The invention relates to fast identification of a powdery mildew resistance gene of carica papaya l, relating to subject knowledge including plant comparative genomics, genetics, bioinformatics and the like, belonging to the field of plant biotechnology sciences. Application of the invention mainly comprises the steps: 1) downloading complete genome sequence of the carica papaya l and acquiring MLO-type genes; 2) identifying the MLO-type genes; 3) researching phylogenetic relationships of the MLO-type genes; and 4) comparing MLO-type powdery mildew resistance genes. The invention has the advantages that discovery period of the powdery mildew resistance gene of the carica papaya l is effectively shortened, which assists in fast identification of the powdery mildew resistance gene; that identified candidate powdery mildew resistance genes are developed with corresponding co-segregation functional markers (SNP, SCAR, etc.), which can be used in fast auxiliary selection of molecular markers of the powdery mildew resistance gene with high accuracy; that other molecular markers of resistance genes can be combined to formulate multi-resistance breeding materials, which shortens breeding years and improves breeding yields; and that a foundation is laid to illustrate the powdery mildew resistance gene of the carica papaya l.

The present invention is rapid identification of a powdery mildew gene of Medicago truncatula, relates to discipline knowledge of plant comparative genomics, genetics and bioinformatics and belongs to the technical field of plant biotechnology. The invention mainly comprises the following steps: 1) download of Medicago truncatula genome sequence and collection of an MLO gene; 2) identification of MLO type gene; 3) MLO gene phylogenetic relationship; and 4) comparison of MLO type powdery mildew gene. The invention effectively shortens a mining cycle of the powdery mildew gene of Medicago truncatula and facilitates the rapid identification of the powdery mildew gene. The identified candidate powdery mildew genes can be used to develop corresponding coseparation functional markers (SNP and SCAR, etc.), and can also be used quickly for molecular marker assisted selection of powdery mildew resistant gene, and has high accuracy. Combined with other disease resistant gene molecular markers, the identified candidate powdery mildew genes can be used in development of multiresistance breeding material, so as to shorten the breeding period and improve breeding efficiency. The invention lays foundation to elaborate molecular mechanism of powdery mildew resistance of Medicago truncatula.

The present invention is a method for rapidly identifying an orange MLO powdery mildew resistance gene, relating to plant comparative genomics, genetics, bioinformatics and other disciplines of knowledge, and belonging to the field of plant biotechnology science. The method in the invention mainly comprises the following steps of: 1) download of an orange full genome sequence and collection of an MLO gene; 2) identification of the MLO gene; 3) identification of a candidate MLO powdery mildew gene through phylogenetic relationship of the MLO gene; and 4) comparison of the MLO powdery mildew gene. The method in the invention can effectively shorten a mining cycle of the orange powdery mildew gene, facilitating rapid identification of the powdery mildew gene; the method can develop corresponding cosegregation functional markers (SNP, SCAR and the like) through the identified candidate powdery mildew gene and can also be used in fast molecular marker-assisted selection of the powdery mildew resistance gene with high accuracy; the method can also create multiple breeding materials with resistance property through combination of other resistance gene molecular markers, shortening a breeding period and improving breeding efficiency; the method can further lays a foundation for describing an orange powdery mildew resistance molecular mechanism.

The invention provides a tracing method of cronobacter spp. in infant formula milk powder. The method comprises the steps that by means of a multiple-locus sequence typing technology, molecular typing research is conducted on the cronobacter spp. of PIF raw materials, semi-finished products, finished products and processing environments thereof, population characteristics of the cronobacter spp. are revealed, a phylogenetic relationship of the cronobacter spp. is confirmed, phylogenetic analysis is conducted on the cronobacter spp. through bioinformatics, and therefore genetic characteristics of the cronobacter spp. in the above-mentioned environments are revealed systematically; on the basis of cronobacter spp. MLST typing, correlation analysis is conducted by taking ST of pathogenic bacteria and environmental sources as variables, key links which are most prone to pollute the cronobacter spp. in the PIF processing process and distribution rules are determined, and therefore the source of the cronobacter spp. in the infant formula milk powder is traced. The purpose of fundamentally monitoring the PIF production process and ensuring the PIF quality are achieved.

The invention discloses a method for quickly identifying a manihot esculenta mildew-resistance locus (MLO) gene, relates to knowledge of plant comparative genomics, genetics, bioinformatics and the like and belongs to the field of plant biotechnology science. The method mainly comprises the following steps of: 1) downloading a manihot esculenta whole genome sequence, and collecting the MLO gene; 2) identifying the MLO gene; 3) identifying the MLO gene according to the MLO gene phylogenetic relationship; and 4) comparing the MLO genes. By the method, the discovery cycle of the manihot esculenta MLO gene is shortened effectively, and the MLO gene can be quickly identified; corresponding coseparation functional markers (single nucleotide polymorphism (SNP) and specific combining ability (SCA)) can be developed by the identified candidate MLO gene, and the method can be quickly used for molecular marker auxiliary selection of the MLO gene, and is high in accuracy; by combining other disease-resistant gene molecular markers, multiresistance breeding materials can be prepared, the breeding cycle is shortened, and the breeding efficiency is improved; and the foundation is laid for elaborating a manihot esculenta MLO gene molecular mechanism.

To produce high-performance specific gene amplification primers for detecting, quantifying, or identifying Vibrio cholerae and Vibrio mimicus, having low risk of misidentification and practically sufficient amplification efficiency and amplification specificity. We have determined partial nucleotide sequences of rpoD and gyrB genes of Vibrio cholerae, Vibrio mimicus, and closely related species, revealed their phylogenetic relationship, and then identified nucleotides characteristic of Vibrio cholerae and Vibrio mimicus, respectively. Thus, we have made it possible to design probes having high specificity and gene amplification primers having high specificity and excellent amplification efficiency, both of which contain the characteristic nucleotides.

The invention relates to rapid identification of a pear powdery mildew resistance gene, and relates to the subject knowledge of plant comparative genomics, genetics and bioinformatics, belonging to the field of science of biotechnology. The rapid identification of the pear powdery mildew resistance gene comprises the following main steps of: 1) downloading of a complete genome sequence of a pear and collection of an MLO gene; 2) identification of the MLO gene; 3) MLO gene phylogenetic relationship; and 4) comparison of an MLO powdery mildew gene. The rapid identification of the pear powdery mildew resistance gene, provided by the invention, has the advantages of effectively shortening the pear powdery mildew gene mining period, and being favorable for the rapid identification of the powdery mildew gene; corresponding co-segregation functional markers (SNP, SCAR and the like) can be developed through the identification of candidate powdery mildew genes, and the co-segregation functional markers can be rapidly used for the molecular marker-assisted selection of the powdery mildew resistance gene, so that the accuracy is high; by combining other powdery mildew resistance gene molecular markers, a multi-resistance breeding material can be created, the breeding period can be shortened, and the breeding efficiency can be improved; a foundation is laid for explaining a pear powdery mildew resistance molecular mechanism.

A method is described for efficiently searching non-coding DNA for known control elements. Short conserved DNA sequences can be identified among 3 or more species by selecting DNA sequences from species having a total genetic distance larger than one substitution per site at a neutrally evolving region and calculating the total substitutions using pair-wise genetic distances, with the pairs for comparison selected based on phylogenetic relationships.

The invention relates to rapid identification of MLO (Mycoplasma Like Organism) powdery mildew resistant genes of a melon, relates to comparative genomics of plants, genetics, bioinformatics and other disciplinary knowledge, and belongs to the field of biotechnology science of plants. The rapid identification is mainly carried by the following steps: 1) downloading the whole genome sequence of the melon, and acquiring MLO genes; 2) identifying the MLO genes; 3) obtaining the phylogenetic relationship of MLO genes; 4) comparing MLO powdery mildew resistant genes. By virtue of adopting the rapid identification, the powdery mildew resistant genes mining cycle of the melon can be effectively reduced, which is beneficial to the rapid identification of powdery mildew resistant genes; the identified candidate powdery mildew resistant genes are utilized to develop corresponding coseparation functional markers (such as SNR and SCAR) and can also be quickly used for assistant selection of molecular markers resistant to powdery mildew resistant genes, and the accuracy is high; in combination with other anti-disease gene molecular markers, a plurality of resistive breeding materials can be created, the breeding periods can be reduced, and the breeding efficiency can be increased; the foundation is provided for describing a powdery mildew resistant molecular mechanisms of the melon.

The invention belongs to the technical field of gene detection, and discloses amphibian mitochondria general macro bar code amplification primers and an application method thereof. The amplification primers comprise a primer pair formed by combining at least one forward primer and one reverse primer. Products obtained by PCR amplification through combination of Am312-F1 and Am312-R1, combination of Am246-F2 and Am246-R2, combination of Am250-F3 and Am250-R3.1, combination of Am250-F3 and Am305-R3.2 and combination of Am250-F3 and Am387-R3.3 meet the requirements of next-generation sequencing and can be used for species identification and diversity analysis of amphibians; through flexible combination of the above primer pairs, the research purposes of amphibian species classification, phylogenetic relationship, systematic geography and the like can be achieved.

To produce a high-performance specific gene amplification primer for detecting, quantifying, or identifying Vibrio vulnificus, having low risk of misidentification and practically sufficient amplification efficiency and amplification specificity. We have determined partial nucleotide sequences of gyrB, rpoD, and recA genes of Vibrio vulnificus and the closely related species, revealed their phylogenetic relationship, and then identified nucleotides characteristic to Vibrio vulnificus. Thus, we have made it possible to design a probe having high specificity and a gene amplification primer having high specificity and excellent amplification efficiency, both of which contain the characteristic nucleotides.

The invention discloses a prunus verecunda chloroplast genome for the first time, applies the prunus verecunda chloroplast genome to prunus verecunda system growth research, and analyzes the prunus verecunda growth status in prunus. According to the prunus verecunda chloroplast genome, molecular systematics and phylogeny genomics method are used for establishing phylogenetic relationship of subgenus cerasus species through the chloroplast genome, on the basis, the whole chloroplast genome is taken as a super DNA bar code of subgenus cerasus and used for identifying sakura varieties, technicalsupports for protecting of sakura germplasm resources and species identification are provided, and great significances on breeding typical subgenus cerasus plants, and the evaluation, protection and utilization of genetic diversity are brought.

The invention discloses a method for researching polymorphism of different geographical populations cpDNatnT-trnL of Snowfox Crested wheatgrass. The method includes the steps: collecting a plurality of tender leaves of the Snowfox Crested wheatgrass in a wheatgrass population; extracting the total DNA of each tender leaf of the Snowfox Crested wheatgrass; amplifying the trnT-trnL fragment of the cpDNA of each tender leaf of the Snowfox Crested wheatgrass to obtain a plurality of amplification products; carrying out sequencing to obtain a nucleotide sequence of a trnT-trnL amplified fragment ofthe cpDNA of each tender leaf of the Snowfox Crested wheatgrass; analyzing the sequence data by adopting software; and according to data analysis, obtaining cpDNAtrnT-trnL polymorphism information ofthe Snowfox Crested wheatgrass in different geographical populations, including sequence variation, genetic diversity, genetic structure of populations and phylogenetic relationship information amongthe populations. The method for researching polymorphism of different geographical populations cpDNatnT-trnL of Snowfox Crested wheatgrass can accurately obtain the polymorphism information of different geographical populations of the Snowfox Crested wheatgrass, and can provide a scientific basis for species protection.

The invention provides rapid identification of powdery mildew resistant gene of Chinese cabbage, relates to knowledge in the disciplines of plant comparative genomics, genetics and bioinformatics, and belongs to the scientific field of plant biotechnology. The invention includes the steps of: 1) downloading the whole genome sequence of Chinese cabbage and acquiring MLO type gene; 2) identifying the MLO genotype; 3) identifying MLO gene phylogenetic relationship; and 4) comparing MLO-type powdery mildew gene. The invention effectively shortens the gene mining cycle for Chinese cabbage powdery mildew, and is conducive to the rapid identification of powdery mildew resistant gene; corresponding coseparation functional markers (SNP, SCAR, etc.) are developed through the identified candidate powdery mildew genes, and the identified candidate powdery mildew genes can also be used for fast molecular marker assisted selection of powdery mildew resistant genes and have high accuracy; combined with other resistant gene molecular markers, multi-resistance breeding material can be created, so as to shorten the breeding period and improve breeding efficiency. Therefore, the invention lays foundation for the explanation of powdery mildew resistant molecular mechanism of Chinese cabbage.

The invention discloses specific SSR primers for malus sieversii and the cultivated apple and applications of the specific SSR primers. Based on the whole genome sequence of the cultivated apple, a functional gene sequence relevant to the stress resistance of apple is adopted as a template, and 15 pairs of SSR primers amplifying SSR target bands with specificity, stability and polymorphism in malus sieversii and the cultivated apple are screened, wherein the nucleotide sequences of the SSR primers are as shown in SEQ ID No.1-30. 8 pairs of SSR primers only capable of amplifying SSR target bands in the cultivated apple with specificity are also screened. The protein products coded by the target bands amplified by the SSR primers are known, and the SSR primers can be used for carrying out genetic diversity, polymorphis or phylogenetic analysis on the malus sieversii and cultivated apple, thus disclosing the genetic diversity and phylogenetic relationship of the malus sieversii and cultivated apple and the influences of the obtained genetic variation on the malus sieversii and cultivated apple in the aspects including the biological function.

The invention discloses a prunus takasagomontan chloroplast genome for the first time. The prunus takasagomontan chloroplast genome is applied to the phylogenetic study of prunus takasagomontan to analyze the phylogenetic status of the prunus takasagomontan in prunus. According to the study, molecular systematics and phylogenetic genomics methods are utilized, a phylogenetic relationship of subgenus cerasus species is established through the prunus takasagomontan chloroplast genome, and on this basis, the whole chloroplast genome is utilized as a super DNA bar code of the subgenus cerasus foridentifying varieties of cerasus, which provides technical support for protection and species identification of cerasus germplasm resources and is of great significance for breeding, genetic diversityevaluation, protection and utilization of typical subgenus cerasus plants.

The invention discloses a method for filtering, evolving and classifying proteome and a system thereof. The method comprises the following steps of: an original data acquiring step: acquiring the genome data and the proteome data (S110) of species to be classified; a predicting step: predicting a transversal transfer gene (S120) in a genome sequence based on the genome data; a filtering step: filtering a proteome sequence (S130) corresponding to the transversal transfer gene in the proteome based on the proteome data and the transversal transfer gene; a calculating step: calculating the evolving distance (S140) between the species with the filtered proteome sequence; and an inferring step: inferring a phylogeny relation (S150) between the species by utilizing the evolving distance between the species. According to the invention, existing interference information which is caused by transversal gene transfer during deducing a biogenesis process can be eliminated so that the deduced biogenesis process is more accurate to provide a more reliable classification basis for biological evolution and classification.

The invention provides quick identification of a powdery mildew resistant gene for barley, relates to subject knowledge of plant comparative genomics, genetics, bioinformatics and the like and belongs to the field of plant biotechnology science. The quick identification mainly comprises the following steps: (1) downloading a barley whole-genome sequence and acquiring an MLO gene; (2) identifying the MLO gene; (3) establishing a phylogenetic relationship of the MLO gene; and (4) comparing an MLO powdery mildew gene. According to the quick identification, the mining period of the barley powdery mildew gene is effectively shortened to facilitate quick identification of the powdery mildew gene; the corresponding coseparation functional markers (SNP, SCAR and the like) are developed through the identified candidate powdery mildew gene and quickly used for molecular marker auxiliary selection of the powdery mildew resistant gene, and the accuracy is high; through combination with other anti-disease gene molecular markers, creation of a multi-resistant breeding material can be carried out, the breeding period is shortened, and the breeding efficiency is improved; and a foundation is laid for stating the barley powdery mildew resistance molecular mechanism.

The invention discloses a microsatellite primer for macrobrachium nipponensis diversity analysis. The microsatellite primer for macrobrachium nipponensis diversity analysis comprises eleven pairs of microsatellite primers, which are respectively MN01, MN02, MN03, MN04, MN05, MN06, MN07, MN08, MN09, MN10 and MN11; meanwhile, the invention also provides application of the microsatellite primer in macrobrachium nipponensis population genetic structure analysis through a following method comprising the steps: (a) extracting genome DNA (Deoxyribose Nucleic Acid) to be analyzed; (b) adopting the genome DNA as a template, and adopting the microsatellite primer for carrying out PCR (Polymerase Chain Reaction) molecular marker detection; (c) carrying out genetic structure analysis. The microsatellite primer provided by the invention has the characteristics of stable PCR amplification results, high polymorphism and the like, can be used to utilize molecular markers for carrying out genetic diversity analysis, population genetic structure analysis, genetic map construction, gene mapping, variety identification, germplasm preservation, quantitative trait gene analysis, evolution and phylogenetic relationship research and the like, and has a better application value.

Novel isolated cDNA encoding the precursor of the novel gonadotropin-releasing hormones in four species of the fish lamprey is disclosed. The use of such cDNA's in studying the phylogenetic relationship of various species of fish and vertebrates overall; and the use of such cDNA's for controlling the gonadal development and spawning of fish, including inducing and inhibiting maturation, spawning and reproduction, is also described. Methods by which the novel peptides may be administered to fish to control their reproduction are also described.