Abstract:
The present invention provides nucleic acid amplification methods that desirably reduce or eliminate false positive amplification signals resulting from contaminating biological material, e.g., nucleic acid, that may be present in one or more reagents used in an amplification reaction and/or that may be present in the environment in which an amplification reaction is performed. The invention offers the further advantage of requiring less stringent purification and/or sterility efforts than conventionally needed in order to ensure that enzymes and other reagents used in amplification reactions, and the environment in which an amplification reaction is performed, are free of bacterial or other nucleic acid contamination that may yield false positive results.
Abstract:
The present invention is directed to novel methods of synthesizing multiple copies of a target nucleic acid sequence which are autocatalytic (i.e., able to cycle automatically without the need to modify reaction conditions such as temperature, pH, or ionic strength and using the product of one cycle in the next one). In particular, the present invention discloses a method of nucleic acid amplification which is robust and efficient, while reducing the appearance of side-products. The method uses only one primer, the "priming oligonucleotide," a 3'blocked promoter oligonucleotide and optionally, a means for terminating a primer extension reaction, to amplify RNA or DNA molecules in vitro, while reducing or eliminating the formation of side-products. The method of the present invention minimizes or eliminates the emergence of side-products, thus providing a high level of specificity. Furthermore, the appearance of side-products can complicate the analysis of the amplification reaction by various molecular detection techniques. The present invention minimizes or eliminates this problem, thus providing an enhanced level of sensitivity.
Abstract:
Methods for efficiently capturing a target nucleic acid from a sample by using a mixture that contains a capture probe specific for the target nucleic acid, the target nucleic acid, and a denaturant chemical, which mixture is incubated at elevated temperature for a short time, are disclosed. Compositions that include a capture probe that specifically binds to a target nucleic acid and a denaturant chemical, which when mixed with the target nucleic acid and incubated at elevated temperature for a short time, promote efficient hybridization of the capture probe and target nucleic acid are disclosed.
Abstract:
Methods for detecting and identifying individual nucleic acid base phosphoramidites in a sample solution by matching fluorescent excitation and/or emission spectra to similar spectra of known phosphoramidites are disclosed. Methods of determining the accuracy of nucleic acid synthesis by analyzing fluorescent spectra of samples (influent, effluent, reaction mixtures) associated with individual coupling steps that use nucleic acid base phosphoramidites andidentifying the phosphoramidite contained in each sample are disclosed.
Abstract:
Compositions, reaction mixtures, kits and methods used in amplifying and detecting nucleic acids from various species of the class Mollicutes. In certain aspects and embodiments, particular regions of the 23S rRNA or gene encoding said rRNA have been identified as preferred targets for nucleic acid amplification reactions of a sample suspected containing at least one species of Mollicutes. Some oligomers comprise tag regions. Some oligomers comprise target closing regions, promoter sequences, and/or binding moieties, such as homopolymeric and heteropolymeric nucleotide sequences. Samples can be from any source suspected of containing a species of the class Mollicutes. Preferred sample sources include bioreactors, cell lines, cell culture wares and pharmaceutical manufacturing wares, to name a few.
Abstract:
Disclosed are compositions, kits and methods for a selective hybridization and capture of a specific target nucleic acid in a heterogeneous mixture of nucleic acids The target nucleic acids are then used in subsequent analysis The method offers the advantage of requiring less stringent purification and/or sterility efforts than conventionally needed in order to ensure a suitable environment for using enzymes and other reagents in subsequent analysis
Abstract:
The present invention provides compositions, kits and methods for the selective hybridization and capture of a specific target nucleic acid. The specific target nucleic acid may be present in a heterogeneous mixture of nucleic acids. Selective hybridization and capture provides a target nucleic acid that is substantially free of non-target and/or contaminating nucleic acids. Target nucleic acids that have been selectively hybridized and captured using the current invention are then used in subsequent analysis, wherein the presence of non-target and/or contaminating nucleic acids that interfere with said subsequent analysis have been substantially reduced or eliminated, thereby providing improved analysis results. The invention offers the further advantage of requiring less stringent purification and/or sterility efforts than conventionally needed in order to ensure that enzymes and other reagents used in subsequent analysis, or present in the environment in which an assay is performed, are free of bacterial or other contaminating nucleic acids.
Abstract:
Methods and compositions are described for isothermal nucleic acid amplification of a nucleic acid template strand by using an oligonucleotide primer that includes an AT-rich nucleotide sequence and a polymerase having strand displacement activity.
Abstract:
The present invention features "molecular torches" and the use of molecular torches for detecting the presence of a target nucleic acid sequence. Molecular torches contain a target binding domain, a target closing domain, and a joining region. The target binding domain is biased towards the target sequence such that the target binding domain forms a more stable hybrid with the target sequence than with the target closing domain under the same hybridization conditions. The joining region facilitates the formation or maintenance of a closed torch.
Abstract:
Compositions, reaction mixtures, kits and methods used in amplifying and detecting nucleic acids from various species of the class Mollicutes. In certain aspects and embodiments, particular regions of the 23S rRNA or gene encoding said rRNA have been identified as preferred targets for nucleic acid amplification reactions of a sample suspected containing at least one species of Mollicutes. Some oligomers comprise tag regions. Some oligomers comprise target closing regions, promoter sequences, and/or binding moieties, such as homopolymeric and heteropolymeric nucleotide sequences. Samples can be from any source suspected of containing a species of the class Mollicutes. Preferred sample sources include bioreactors, cell lines, cell culture wares and pharmaceutical manufacturing wares, to name a few.