摘要:
The present teachings provide methods, compositions, and kits for detecting the presence of protein aggregates. In some embodiments, the protein aggregate is treated with a labeled precursor, and the labeled precursor is incorporated into the protein aggregate to form a labeled protein aggregate. The labeled protein aggregate is then measured, thus detecting the presence of the protein aggregate. In some embodiments, the labeled protein aggregate is detected by interaction of labeled precursors, for example by a proximity ligation assay.
摘要:
The present teachings provide methods, compositions, and kits for detecting micro RNAs (miRNAs). In some embodiments, the miRNAs are quantified from formalin-fixed paraffin-embedded tissue samples in which messenger RNA is degraded. The present teachings take advantage of the observation that most mature miRNAs in vivo are protected by degradation as a result of their association with RISC. Thus, novel methods of studying nucleic acids in archived tissues containing degraded messenger RNA are provided, wherein RISC-protected miRNAs are liberated, and analyzed.
摘要:
Binary probe and clamp compositions conduct methods for target hybridization detection. Where the probe is a substrate for exonuclease cleavage, the composition provides quantitation and detection of PCR products, by real-time and end-point measurements. Where the probe is an amplification primer, the composition provides an improved method for labelling and detection of PCR products. Probes and clamps may be labelled with fluorescent dyes, quenchers, hybridization-stabilizing moieties, chemiluminescent dyes, and affinity ligands. Clamps may be nucleic acid analogs, such as 2-aminoethylglycine PNA.
摘要:
The present teachings provide methods, compositions, and kits for reverse transcribing and amplifying small nucleic acids such as micro RNAs. High levels of multiplexing are provided by the use of a zip-coded stem-loop reverse transcription primer, along with a PCR-based pre-amplification reaction that comprises a zip-coded forward primer. Detector probes in downstream decoding PCRs can take advantage of the zip-code introduced by the stem-loop reverse transcription primer. In some embodiments, further amplification is achieved by cycling the reverse transcription reaction. The present teachings also provide compositions and kits useful for performing the reverse transcription and amplification reactions described herein.
摘要:
Binary probe and clamp compositions conduct methods for target hybridization detection. Where the probe is a substrate for exonuclease cleavage, the composition provides quantitation and detection of PCR products, by real-time and end-point measurements. Where the probe is an amplification primer, the composition provides an improved method for labelling and detection of PCR products. Probes and clamps may be labelled with fluorescent dyes, quenchers, hybridization-stabilizing moieties, chemiluminescent dyes, and affinity ligands. Clamps may be nucleic acid analogs, such as 2-aminoethylglycine PNA.
摘要:
The present invention is directed to methods, reagents, and kits for detecting the presence or absence of (or quantifying) target polynucleotide sequences and proteins in at least one sample using encoding and decoding reactions. When a particular target polynucleotide is present in a sample for example, a reaction product is formed in the encoding reaction that includes addressable primer portions. At least one labeling probe and at least one address primer can be employed in the decoding amplification reaction thereby providing a detectable signal value depending upon whether a sequence is present or absent. In some embodiments, the encoding comprises a ligation reaction with linker probes, and single nucleotide polymorphisms (SNPs) are analyzed.
摘要:
The present disclosure relates to methods of analyzing binding interactions between a binding component and a receptor component by translocating unbound and any bound components through a pore and detecting the unbound and bound components.
摘要:
Methods for amplifying polynucleotides, e.g., by PCR, in a sample comprising polynucleotide targets present at very low concentration, comprising: (a) applying amplification reactants to the surface of a substrate comprising reaction spots, wherein the reactants comprise the sample and an amplification reagent; (b) forming a sealed reaction chamber, having a volume less than about 120 nanoliters, preferably less than about 20 nanoliters, over each of said reaction spots; and (c) thermal cycling the substrate and reactants. In one embodiment, the forming step comprises loading a sealing fluid, e.g., mineral oil, on the surface so as to cover the reaction spots. The present invention also provides microplates, comprising: (a) a substrate having at least about 10,000 reaction spots, each comprising a primer and a droplet of reagent having a volume less than about 120 nanoliters, preferably less then about 20 nanoliters; and (b) a sealing liquid isolating each of the spots.
摘要:
The invention relates to insulating combinatorial nucleobase oligomers that comprise universal base analogs, where the oligomers are formed by the ligation of two or more oligomer “blocks” via a covalent linkage. Universal bases may serve to insulate specifically binding nucleobases from the effects of the covalent linker region joining two oligomer blocks together, so that the universal bases at least partially negate the Tm penalty caused by the covalent linkage, effective to reduce the required minimal length of the oligomer blocks and the combinatorial oligomer. The resulting insulating nucleobase combinatorial oligomers find use in any hybridization-based application, including use as probes and primers. The combinatorial oligomers of the present invention provide advantages over existing combinatorial oligomer systems currently known in the art.