522 results about "Virulent characteristics" patented technology

Various aspects and embodiments of the invention are directed to methods and compositions for reversing antibiotic resistance or virulence in and/or destroying pathogenic microbial cells such as, for example, pathogenic bacterial cells. The methods include exposing microbial cells to a delivery vehicle with at least one nucleic acid encoding an engineered autonomously distributed circuit that contains a programmable nuclease targeted to one or multiple genes of interest.

The present invention provides methods and compositions related to modulating the resistance of a cell against a target nucleic acid or a transcription product thereof. In some preferred embodiments, the present invention provides compositions and methods for the use of one or more cas genes or proteins for modulating the resistance of a cell against a target nucleic acid or a transcription product thereof. In some embodiments, the present invention provides methods and compositions that find use in the development and use of strain combinations and starter culture rotations. In additional embodiments, the present invention provides methods for labelling and/or identifying bacteria. In some preferred embodiments, the present invention provides methods for the use of CRISPR loci to determine the potential virulence of a phage against a cell and the use of CRISPR-cas to modulate the genetic sequence of a phage for increased virulence level. In still further embodiments, the present invention provides means and compositions for the development and use of phages as biocontrol agents.

The present invention is directed to mutant Salmonella sp. having a genetically modified msbB gene in which the mutant Salmonella is capable of targeting solid tumors. The present invention further relates to the therapeutic use of the mutant Salmonella for growth inhibition and/or reduction in volume of solid tumors.

A Candida albicans bloodstream infections cause significant morbidity and mortality in hospitalized patients. Filament formation and adherence to host cells are critical virulence factors of C. albicans. Multiple filamentation regulatory pathways have been discovered, however the downstream effectors of these regulatory pathways remain unknown. The cell surface proteins in the ALS group are downstream effectors of the filamentation regulatory pathway. Particularly, Als1p mediates adherence to endothelial cells in vitro and is required for virulence. The blocking of adherence by the organism is described resulting from the use of a composition and method disclosed herein. Specifically, a pharmaceutical composition comprised of a gene, gene product, or specific antibody to the ALS gene family is administered as a vaccine to generate an immune response capable of blocking adherence of the organism.

Attenuated mutant Salmonella bacteria containing inactivated virulence genes are provided for use in safe, efficacious vaccines.

The invention provides new strains of the Modified Vaccinia Virus Ankara (MVA) that have a strongly reduced virulence for most mammals, especially humans, but nevertheless grows in cells of a continuous cell line approved for the production of a therapeutic agent such as a vaccine. The invention also provides a method for producing said adapted MVA strains. The adapted MVA can be used e.g. for parenteral immunization, as a vector system, or in the active or inactivated from as an adjuvant or as a regulator of the unspecific components of the immune system.

The invention includes a chimeric virus for use in a vaccine preparation having a genome comprising nucleic acid sequences encoding at least one structural protein from one flavivirus and nucleic acid sequences encoding nonstructural protein from another flavivirus. The genome preferably includes mutations within the viral genome that reduce virus virulence and in a particularly preferred embodiment these vaccines are directed to flaviviruses such as dengue virus, tick-borne encephalitis virus and Japanese encephalitis virus. The invention also includes a baculovirus having a recombinant dengue cDNA sequence which encodes: (1) dengue virus capsid protein, pre-matrix protein, envelope glycoprotein and NS1 and NS2a nonstructural proteins or (2) dengue envelope glycoprotein or (3) dengue non-structural proteins NS1 and NS2a. The invention further includes a baculovirus having a recombinant Japanese B encephalitis virus cDNA sequence which encodes the Japanese B encephalitis virus capsid protein, pre-matrix protein, envelope glycoprotein and non-structural proteins NS1 and NS2a. The invention further includes a vaccine and a method to produce that vaccine.

An array of nucleic acid probes is described for simultaneously identifying or characterizing a pathotype of a microorganism and detecting antibiotic resistance of said microorganism. Methods are also described for detecting the presence of a microorganism in a sample, as well as determining its pathotype and its antibiotic resistance, using the array.

The present invention is directed to mutant Salmonella sp. having a genetically modified msbB gene in which the mutant Salmonella is capable of targeting solid tumors. The invention is also directed to Salmonella sp. containing a genetically modified msbB gene as well as an genetic modification in a biosynthetic pathway gene such as the purI gene. The present invention further relates to the therapeutic use of the mutant Salmonella for growth inhibition and/or reduction in volume of solid tumors.

Live-attenuated vaccines against Edwardsiella ictaluri or against Pasteurella piscicida are disclosed. Both vaccines are incapable of reversion to virulence, because both are made by deletion mutations in the aroA gene, the purA gene, or both. These vaccines may be used not only to vaccinate fish against Edwardsiella ictaluri or Pasteurela piscicida, but also to serve as vectors to present antigens from other pathogens to the fish, thereby serving as vaccines against other pathogens as well, with no risk of infection by reversion to the virulent form of the pathogen in which the antigen occurs naturally.

The present invention relates to the use of the cyclic dinucleotide c-di-GMP and cyclic dinucleotide analogues thereof in a method for attenuating virulence of a microbial pathogen or for inhibiting or reducing colonization by a microbial pathogen. This method further inhibits microbial biofilm formation and is capable of treating bacterial infections. The microbial colonization or biofilm formation inhibited or reduced may be on the skin or on nasal or mucosal surface. The microbial colonization or biofilm formation inhibited can also be on the surfaces of medical devices, especially those in close contact with the patient, as well on the surfaces of industrial and construction material where microbial colonization and biofilm formation is of concern.

The present invention provides nucleotide sequences, methods and compositions that enable the experimental determination as to whether any gene in the genome of Aspegillus fumigatus is essential, and whether that gene is required for virulence or pathogenicity. The methods involve the construction of genetic mutants in which a target gene is placed under conditional expression. The identification of essential genes and those genes critical to the development of virulent infections, provides a basis for the development of screens for new drugs against Aspergillus fumigatus. The present invention further provides Aspergillum fumigatus genes that are essential and are potential targets for drug screening. The nucleotide sequence of the target genes can be used for various drug discovery purposes, such as expression of the recombinant protein, hybridization assay and construction of nucleic acid arrays. The uses of proteins encoded by the essential genes, and genetically engineered cells comprising modified alleles of essential genes in various screening methods are also encompassed by the invention.

The invention discloses an HEK (human embryonic kidney) 293 cell line applicable to serum-free culture and an application thereof. According to the invention, the HEK 293 cell (293SF) applicable to serum-free culture is obtained by adopting a culture solution progressive substitution method, wherein the preservation number of the HEK 293 cell is CGMCC (China General Microbiological Culture Collection Center) No.5824. Detection shows that the 293SF cell has stable adenovirus proliferation capacity and foreign protein expressing ability; average lesion time is 97 hours and is reduced by 12.9% compared with the HEK 293 cell; virus virulence reaches up to 107.48TCID50/mL and is improved by 43.3% compared with the HEK293 cell; and stability is good while generation number is improved, and the state and susceptibility of the 293SF cell are not changed after the 293SF cell is continuous passage is carried out for sixteen times. The cell line disclosed by the invention can be used for serum-free production of an adenovirus vector vaccine.

The invention relates to the technical field of biological gene chips, and particularly relates to a gene chip for screening various ophthalmological hereditary diseases as well as preparation and a usage method of the gene chip. Specific oligonucleotide probes of gene sequences which are related to 261 ophthalmological hereditary diseases are fixed on the surface of a carrier of the gene chip for screening various ophthalmological hereditary diseases; and the gene chip which is related to the 261 ophthalmological hereditary diseases comprises the sequences of all coding region sequences of 954 related virulence genes or disease predisposing genes and introne sequences adjacent to the coding regions. As the specific oligonucleotide probes of the gene sequences which are related to 261 ophthalmological hereditary diseases and the sequences of all the coding region sequences of the related virulence genes or disease predisposing genes and the introne sequences adjacent to the coding regions are fixed on the surface of the carrier of the gene chip, the gene chip provided by the invention is capable of screening a plurality of ophthalmological hereditary diseases at the same time and then the efficiency is greatly improved.

African swine fever virus (ASFV) is the etiological agent of a contagious and often lethal viral disease of domestic pigs. Control of ASF has been hampered by the unavailability of vaccines. Experimental vaccines have been derived from naturally occurring, cell culture-adapted, or genetically modified live attenuated ASFVs; however, these vaccines are only successful when protecting against homologous viruses. Among viral genes reported to be involved in virulence are components of the multi gene family (MGF). Here we report the construction of a recombinant ΔMGF virus derived from the highly virulent ASFV Georgia 2007 (ASFV-G) isolate. In vivo, ASFV-G ΔMGF administered intramuscularly (IM) to swine at either 10² or 10⁴ HAD₅₀ are completely attenuated; the inoculated animals are completely asymptomatic. Animals infected with 10² or 10⁴ HAD50 of ASFV-G ΔMGF are protected against the presentation of clinical disease when challenged at 28 days post infection with the virulent parental strain Georgia 2007.

Disclosed are methods of increasing the virulence of a bacteriophage, comprising contacting a bacteriophage with a composition comprising a bacterium or bacterial extract; and a polymer. Also disclosed are methods of propagating and isolating therapeutic bacteriophages that involve use of dilute polymer compositions. Also disclosed are pharmaceutical compositions the bacteriophage for which virulence has been increased by the methods set forth herein or which have been isolated by the methods set forth herein.

The present invention relates to a detection chip for performing gene detection to various vibrio and its detection and applications. The invention provides 16S rRNA sequences corresponding to each vibrio of vibrio anguillarum, vibrio harveyi, vibrio alginolyticus, vibrio parahaemolyticus, brilliant vibrio and Fisher vibrio; heat shock protein hsp60 probe sequence; virulence gene probe sequence; 16S rRNA forward primer sequence; 16S rRNA reverse primer sequence; heat shock protein hsp60 forward primer sequence; heat shock protein hsp60 reverse primer sequence; virulence gene forward primer sequence and virulence gene reverse primer sequence. The present invention has specific, sensitive and high-throughput features, can simultaneously detect six kinds of bacteria virulence genes, and the invention will effectively guide the production as an important disease early-warning detection method used in clinical diagnosis of aquatic animals.

The invention discloses a fluorescent quantitative PCR kit for detecting the copy number of a virulence gene of human spinal muscular atrophy. The fluorescent quantitative PCR kit comprises amplimersand fluorescent probes, wherein the amplimers consist of a pair of shared primers for specific amplification of the seventh exon of SMN1 and SMN2 genes, a pair of shared primers for specific amplification of the eighth exon of the SMN1 and SMN2 genes, and a pair of specific primers for specific amplification of a reference gene, i.e., a CFTR gene; and the fluorescent probes consist of a fluorescent probe for specific detection of the seventh exon of the SMN1 gene, a fluorescent probe for specific detection of the eighth exon of the SMN1 gene, a fluorescent probe for specific detection of the seventh exon of the SMN2 gene, a fluorescent probe for specific detection of the eighth exon of the SMN2 gene and a fluorescent probe for specific detection of the reference gene CFTR. The fluorescentquantitative PCR kit for detecting the copy number of the virulence gene of human spinal muscular atrophy is directed at problems and insufficiencies in quantitative detection of the copy numbers of human motoneuron genes and is rapid and simple in detection and reliable in detection results.