489 results about "Molecular beacon" patented technology

A method for detecting compounds of interest in bodily fluids, including exhaled breath and blood. The present invention uses biosensors that mimic naturally occurring cellular mechanisms, including RNA oligonucleotide chains or “aptamers,” in combination with molecular beacons or nanotechnology to provide an effective and efficient method for diagnosing a condition and/or disease within a patient. The subject invention also provides a method for screening those analytes/biomarkers likely to be present in exhaled breath.

Provided are compositions that include an at least partially single-stranded nucleic acid, at least one first molecular beacon, and an enzyme comprising a helicase activity, which enzyme is capable of removing the first molecular beacon from the single-stranded nucleic acid wherein the first molecular beacon is hybridized to a first complementary subsequence of the nucleic acid. Also provided are methods of determining the sequence of a template nucleic acid that include removing molecular beacons that are hybridized to the template from the template in a sequential manner using an enzyme that exhibits a helicase activity, detecting a sequence of fluorescent signals that is produced by the removal of a molecular beacons, and converting the sequence of fluorescent signals into nucleotide sequence information. Sequencing systems in which compositions and methods of the invention can be used are also provided.

The invention belongs to the technical field of neoplastic disease diagnosis, and discloses a kit for early diagnosis of neoplastic disease, a method and applications of the kit. The kit includes a specific capturing and detecting system for a tumor exosome and a molecular beacon fluorescent detection system. The specific capturing and detecting system for the tumor exosome includes a solution ofa magnetic gold nanosphere composite modified by a tumor exosome specific ligand and adopting ferric ferrous oxide as a core, and a gold nanocage solution modified by the exosome specific ligand. Themolecular beacon fluorescent detection system includes a molecular beacon probe provided with a fluorescent group, fluorescent amplification substrate hybrid chains provided with fluorescent groups and a buffer liquid. The kit and the method combine tumor exosome specific capturing and analysis and a molecular beacon fluorescent detection method, and greatly increases accuracy and reliability of early diagnosis of tumor.

The invention discloses a cascading isothermal amplification based miRNA fluorescence detection kit and a miRNA fluorescence detection method. The target miRNA can specifically recognize and form a stable three-way crossing structure with a ternary probe through complementary hybridization of nucleic acids; a ternary primer in the three-way crossing structure performs strand displacement amplification (SDA) along a ternary template and generates a number of SDA template products; the SDA template product can open a difunctional hairpin probe to trigger nickase to perform signal amplification reaction finally; and a cyclophorase digestion molecular beacon can generate cascading amplified fluorescence signals. The kit can detect miRNA low to 100fM; and the detection method has superhigh specificity, can well distinguish highly homologous sequences at different mispairing positions and solves the difficult problem of false positive result caused by poor specificity in the existing detection method.

Methods and compositions for high-throughput identification of protein/nucleic acid binding pairs are provided. In the subject methods, a nucleic acid probe array, e.g., a molecular beacon probe array, is contacted with a target nucleic acid population to produce a hybridized array. The resultant hybridized array is then contacted with a population of proteins to produce a protein bound array. Any resultant array surface bound target nucleic acid/protein complexes are then detected to identify protein/nucleic acid binding pairs. In certain embodiments, the protein and/or nucleic acid members of the identified protein/nucleic acid binding pairs are further characterized. Also provided are systems and kits for use in practicing the subject methods. The subject invention finds use in a variety of different applications.

The present invention provides novel quencher composition comprising anthraquinone quencher moieties. The anthraquinone quencher moieties are useful as quencher labels when attached to biomolecules such as natural or modified polynucleotides, oligonucleotides, nucleosides, nucleotides, carbohydrates and peptides. For example, polynucleotides can be labeled at the 3′ terminus with fluorescence quencher solid support compositions, and polynucleotides can be labeled at internally or at the 5′ terminus. The detectable probes may have a format like molecular beacons, scorpion probes, sunrise probes, conformationally assisted probes and TaqMan probes.

The invention relates to an immunoliposome biochip, a preparation method thereof and an application thereof in biological detection. The immunoliposome provided by the invention is distributed on the chip in a micro-array way, and includes molecule probes, such as molecular beacon with fluorescence; and outside of the immunoliposome is loaded with various ligands. The immunoliposome biochip can specifically capture target cells in a cell mixture, and ensure messenger RNA and/or micromolecule RNA in the target cells without destroying biomarkers in the cells. In addition, the immunoliposome biochip provided by the invention can be used for capturing and selecting nanoparticles secreted by virus and cells, such as micro bubbles and exosomes. The immunoliposome biochip has advantages of simple operation, low cost, rapidness, sensitive and high selectivity, and can be used for molecular detection of various diseases, food safety and other fields.

Dual nucleic acid probes with resonance energy transfer moieties are provided. In particular, fluorescent or luminescent resonance energy transfer moieties are provided on hairpin stem-loop molecular beacon probes that hybridize sufficiently near each other on a subject nucleic acid, e.g. mRNA, to generate an observable interaction. The invention also provides lanthanide chelate luminescent resonance energy transfer moieties on linear and stem-loop probes that hybridize sufficiently near each other on a subject nucleic acid to generate an observable interaction. The invention thereby provides detectable signals for rapid, specific and sensitive hybridization determination in vivo. The probes are used in methods of detection of nucleic acid target hybridization for the identification and quantification of tissue and cell-specific gene expression levels, including response to external stimuli, such as drug candidates, and genetic variations associated with disease, such as cancer.

The invention discloses a transcription factor detection method based on DNA-Ag nanoclusters molecular beacons and exonuclease III cycle signal amplification. The novel nanomaterial DNA-Ag nanoclusters molecular beacon is applied as a fluorescent probe to transcription factor detection for the first time. Also, based on the characteristic that fluorescence adjustment of DNA-Ag nanoclusters molecular beacons is carried out by an enzyme cleavable DNA fragment, exonuclease III is added to participate in signal transformation and also participate in enhancement of the detection signal. The transcription factor detection method provided by the invention has the advantages of no label, high selectivity, low cost and high sensitivity, and can realize high throughput detection of transcription factors in biological samples.

The invention discloses a fluorescence chemical sensor and a method for simultaneously detecting diversified DNA (deoxyribonucleic acid) glycosylases on single-molecular levels and application of thefluorescence chemical sensor. The fluorescence chemical sensor, the method and the application have the advantages that the fluorescence chemical sensor is based on two different molecular beacons including a molecular beacon modified by 8-hydroxyl guanine and a molecular beacon modified by deoxygenated hypoxanthine, the tail end of the molecular beacon modified by the 8-hydroxyl guanine is labeled by cyanine 3 (Cy3) and quenching groups, the tail end of the molecular beacon modified by the deoxygenated hypoxanthine is labeled by cyanine 5 (Cy5) and quenching groups, the fluorescence chemicalsensor is used for detecting 8-hydroxyl guanine DNA glycosylases and N-methylpurine DNA glycosylases and is different from the traditional molecular beacons which can be severely affected by dynamicsand thermodynamics, signal restoration of the Cy3 and the Cy5 depends on molecular beacon splitting with the DNA glycosylases used as media, the DNA glycosylases can be simultaneously sensitively detected by the aid of the method without optional signal amplification, the activity of hOGG1 and hAAG can be detected by the aid of the method in an ultra-sensitive manner without optional signal amplification, the fluorescence chemical sensor can be easily, conveniently and quickly operated, and accurate and reliable test results can be obtained.

The invention discloses a detection kit for quickly identifying donkey skin, horse skin and mule skin, which is used for accurately identifying donkeys, horses, mules and jennets by creatively applying 16SrRNA genes of CKM (creatine kinase) karyogene (nDNA) and mitochondrial genome DNA (mtDNA) at the same time from genetic background of the horses, the donkeys and the mules. The kit adopts an molecular beacon probe (MB) method to carry out a quintuple multicolor fluorescence quantitative PCR (polymerase chain reaction) detection technology, and also can detect donkey, horse, mule and jennet components; and moreover, the kit is added with exogenous internal reference as an interior label, can detect and avoid false negative results produced by PCR inhibitor contained in a sample. The quintuple multicolor fluorescence quantitative PCR is used for detecting in the same tube without opening a cover, so that the detection kit is not easy to pollute, and is accurate and stable, simple to operate, extremely high in sensitivity, strong in specificity, and the like, and therefore, a novel way is explored for identifying the donkey skin, horse skin and mule skin.

Provided herein is a library that comprises a plurality of molecular beacons (MBs), each MB having a detectable label, a detectable label blocker and a modifier group. The library is used in conjunction with nanopore unzipping-dependent sequencing of nucleic acids.

The invention relates to the field of microorganism detection, in particular to a staphylococcus aureus methicillin resistant strain PCR (Polymerase Chain Reaction) detection kit. The invention has the technical scheme of amplifying and detecting a highly conservative specific nucleic acid sequence nuc gene in the staphylococcus aureus gene by using the polymerase chain reaction and molecular beacon and fluorescent probe technologies and simultaneously amplifying and detecting the drug resistant nucleic acid sequence mecA gene to judge whether the strain is a methicillin resistant strain of staphylococcus aureus. The invention also provides PCR amplification primers of the nuc gene and the mecA gene and the sequence of the probe. The kit is applicable to the rapid detection of the staphylococcus aureus methicillin resistant strain in a clinical specimen of a suspect staphylococcus aureus infector and has the advantages of high sensitivity, high specificity, stability, timeliness, convenience for operation and the like.

The invention provides modified molecular beacons detectable by surface enhanced Raman spectroscopy (SERS) and related materials, processes, and methods of use. Examples methods provide for the determination of the presence or absence of a target nucleotide sequence in a sample nucleic acid by (a) providing a detection agent, which agent comprises: (i) a probe comprising a target complement sequence (TCS) being complementary to the target sequence and flanking the TCS, first and second oligonucleotide arms, said first and second oligonucleotide arms forming a stem duplex, and said first arm incorporating a first label moiety being detectable by SERS (e.g. a fluoroscein dye) and said second arm terminating in a second label moiety being detectable by SERS, which second arm further includes a surface seeking group (SSG-e.g. an azo-benzotriazole) capable of promoting association of the second label onto an enhancing surface ii) associated with said probe via said SSG, an enhancing surface, such that said first and second label moieties are in close proximity to each other and to the enhancing surface (b) exposing the sample to the detection agent, (c) detecting hybridisation of the TCS to any target sequence present in the sample by a change in the SERS spectra of said agent.

According to epidemic disease and electrical mirror morphological analysis to ill fish, the cause of disease is iris virus. Definite the iris virus ATPase gene conservative area sequence as augmentation target sequence, and design and synthesize double specificity primers and a molecule beacon probe to quantitative detect fish iris virus. According to the quantitative calibration curve made by different concentration gradient positive plasmid, the logarithm of different gradient quantitative mold number is correlation with Ct, and the correlation coefficient is 0.998; at the same time, the detection method has high sensibility, and it can detect at least 70 virus particles. Detecting other virus and LYCIV genes express that the method has good specificity.

The invention relates to a multiple fluorescence PCR (polymerase chain reaction) kit capable of detecting five DNA (deoxyribonucleic acid) viruses of an aquatic animal simultaneously. The kit comprises a buffer solution, and also comprises five pairs of fluorescence PCR primers and five molecular beacon probes and a PCR primer, wherein the five pairs of fluorescence PCR primers and the five molecular beacon probes are respectively corresponding to channel catfish virus, epizootic haematopoietic necrosis virus, goldfish haematopoietic necrosis virus, fancy carp herpes virus and red porgy iridescent virus, the fluorescence PCR primers and the molecular beacon probes comprise nucleotide sequences shown in SEQ ID NO.3-17, and the PCR primer comprises nucleotide sequences shown in SEQ ID NO.1-2. The multiple fluorescence PCR kit capable of detecting five DNA viruses of the aquatic animal simultaneously can rapidly detect all the DNA viruses infecting the aquatic animals once, the sensitivity is increased, and the cost for detecting single sample is reduced.