摘要:
Nucleic acid analogues such as peptide-nucleic acids (PNAs) which hybridize strongly to nucleic acids are used to inhibit nucleic acid amplification procedures such as PCR. False positives in subsequent PCR assays are prevented by hybridizing a PNA to PCR amplification products. Assays capable of discriminating between single base mutants are conducted by using a PNA hybridizing to one of the two allelic forms to inhibit a PCR amplification of that form selectively. Asymmetric PCR amplifications are carried out by starting a PCR symmetrically using like quantities of forward and reverse primers, and, once the amplification is established, disabling one primer by hybridizing a PNA thereto.
摘要:
A novel class of compounds, known as peptide nucleic acids, bind complementary DNA and RNA strands more strongly than the corresponding DNA or RNA strands, and exhibit increased sequence specificity and solubility. The peptide nucleic acids comprise ligands selected from a group consisting of naturally-occurring nucleobases and non-naturally-occurring nucleobases attached to a polyamide backbone, and contain alkylamine side chains.
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:
An embodiment of an adaptor element for efficient target processing is described that comprises a semi-complementary double stranded nucleic acid adaptor comprising a non-complementary region and a complementary region, where the non-complementary region comprises a first amplification primer site and a second amplification primer site and the complementary region comprises a sequencing primer site and one or more inosine species.
摘要:
The present invention provides for a method of preparing a target nucleic acid fragments to produce a smaller nucleic acid which comprises the two ends of the target nucleic acid. Specifically, the invention provides cloning and DNA manipulation strategies to isolate the two ends of a large target nucleic acid into a single small DNA construct for rapid cloning, sequencing, or amplification.
摘要:
A method is disclosed for preparing novel PNA synthons having protecting groups capable of removal under mild conditions. The PNA synthons are prepared by coupling novel N-substituted nucleobase intermediates having carbamate protection of the exocyclic amino group of the heterocycle to an amino protected backbone or an amino protected backbone ester of the amino acid N-(2-aminoethyl)-glycine. By the method of this invention, the resultant PNA synthons can have orthogonal protection of the carbamate protected nucleobase and the amino protected backbone. The PNA synthons are useful in the synthesis of peptide nucleic acids (PNAs) and other oligomers such as PNA-DNA chimeras, and may be used in automated synthesizers. Novel compositions of matter are also disclosed. In addition, a guanine PNA synthon having selective carbamate protection of the exocyclic 2-amino group with the C6 carbonyl group unprotected is disclosed.
摘要:
The present invention provides for a method of preparing a target nucleic acid fragments to produce a smaller nucleic acid which comprises the two ends of the target nucleic acid. Specifically, the invention provides cloning and DNA manipulation strategies to isolate the two ends of a large target nucleic acid into a single small DNA construct for rapid cloning, sequencing, or amplification.
摘要:
The invention provides methods, kits, and compositions for ligation of PNA-DNA chimeric probes and oligonucleotides when they are hybridized adjacently to template nucleic acids using ligases and ligation reagents. Structural requirements of the chimeras for ligation include 5 to 15 contiguous PNA monomer units, 2 or more contiguous nucleotides, and a 3′ hydroxyl or 5′ hydroxyl terminus. The chimera and/or oligonucleotide may be labelled with fluorescent dyes or other labels. The methods include, for example, oligonucleotide-ligation assays (OLA) and single nucleotide polymorphism detection.
摘要:
The invention provides a collection of probes useful for hybridizing to a target nucleic acid. The probes associate with each other, binding with high affinity to the target nucleic acid, to form three-way junctions and other complexes. At least one of the probes in each collection includes a nucleic acid analog. Methods using the probes in hybridization and as primers are also provided.
摘要:
The invention provides methods and a kit for primer extension of PNA-DNA chimera from template nucleic acids using polymerases, nucleotide 5′-triphosphates, and primer extension reagents. Structural requirements of the chimera for primer extension include 5 to 15 contiguous PNA monomer units, 3 or more contiguous nucleotides, and a 3′ hydroxyl terminus. The chimera and/or a nucleotide is labelled with fluorescent dyes or other labels. The methods include DNA sequencing, DNA fragment analysis, reverse transcription, mini-sequencing, chromosome labelling, amplification, and single nucleotide polymorphism (SNP) detection.