摘要:
The present teachings are generally directed to methods for normalizing at least one species of small nucleic acid that is present in a population of small nucleic acid species, wherein the relative concentration of at least one small nucleic acid species is substantially greater than the relative concentration of at least one other small nucleic acid species in the population. At least one small nucleic acid species is normalized using a multiplicity of primers comprising degenerate sequences. In some embodiments, a small nucleic acid species is identified by inserting at least part of an extension product from a normalized population into a vector and subsequently sequencing the insert. In some embodiments, a small nucleic acid species is identified by determining the sequence of at least part of an extension product.
摘要:
The present invention is directed to methods, reagents, kits, and compositions for identifying and quantifying target polynucleotide sequences. A linker probe comprising a 3′ target specific portion, a loop, and a stem is hybridized to a target polynucleotide and extended to form a reaction product that includes a reverse primer portion and the stem nucleotides. A detector probe, a specific forward primer, and a reverse primer can be employed in an amplification reaction wherein the detector probe can detect the amplified target polynucleotide based on the stem nucleotides introduced by the linker probe. In some embodiments a plurality of short miRNAs are queried with a plurality of linker probes, wherein the linker probes all comprise a universal reverse primer portion a different 3′ target specific portion and different stems. The plurality of queried miRNAs can then be decoded in a plurality of amplification reactions.
摘要:
Disclosed are methods and kits for detecting or quantifying one or more target polynucleotide sequences in a sample. Embodiments of the invention employ a first ligation reaction, a subsequent optional amplification reaction, and a second ligation reaction. Embodiments of the invention combine the specificity of both hybridization and ligation reactions along with universal probe polynucleotide sequences to achieve specific and multiplexed detection of a plurality of target polynucleotide sequences.
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:
The present teachings provide novel methods, compositions, and kits for analyzing mature micro RNAs (miRNAs). By taking advantage of the observation that most mature miRNAs in cells are tightly associated with RISCs, the present teachings provide approaches for studying mature miRNAs without the complications of additional nucleic acids. For example, in some embodiments the present teachings provide a method of purifying mature miRNAs comprising heating a sample to form a lysate, and, degrading the additional nucleic acids. The resulting mixture lacks the additional nucleic acids, and contains mature miRNAs associated with RISCs. Liberating the mature miRNAs from RISCs, for example by a protease, a detergent, and/or heat, can result in a pure collection of mature miRNAs.
摘要:
Compositions, methods, and kits for identifying and for quantitating polynucleotide targets are disclosed. These compositions, methods, and kits are particularly useful when the polynucleotide target is a small RNA molecule, including without limitation microRNA (miRNA), small interfering RNA (siRNA), and certain other classes of non-coding RNA molecules. The forward and reverse primers of the disclosed first primer sets comprise unusually short target-binding portions that are 6-10 nucleotides long. Certain of the disclosed methods employ one or more multiplex reaction steps to identify, quantitate, or identify and quantitate, a multiplicity of target polynucleotides.
摘要:
The present invention relates to the detection of target sequences. The present description discloses compositions and methods involving analog nucleic acids, such as PNA and L-DNA, for the detection of nucleic acids. Additionally, hybrid detectable markers are provided.