摘要:
Streptavidin-metallothionein chimeric proteins with biological recognition specificity in which the streptavidin moiety provides high affinity biotin binding and the metallothionein moiety provides a high affinity metal binding. The binding affinity of the streptavidin-metallothionein chimeric protein both for biotin and heavy metal ions allows specific incorporation into, conjugation with, or labelling of any biological material containing biotin with various heavy metal ions.
摘要:
The present invention is directed to a method for detecting and quantifying rare mutations in a nucleic acid sample. The nucleic acid molecules under investigation can be either DNA or RNA. The rare mutation can be any type of functional or non-functional nucleic acid change or mutation, such as deletion, insertion, translocation, inversion, one or more base substitution or polymorphism. Therefore, the methods of the present invention are useful in detection of rare mutations in, for example, diagnostic, prognostic and follow-up applications, when the targets are rare known nucleic acid variants mixed in with the wildtype or the more common nucleic acid variant(s).
摘要:
The present invention provides a method for determining nucleic acid sequences of a template nucleic acid that requires no prior knowledge of the nucleic acid sequence present in the template nucleic acid. The method is based on combining information about the mass of a fragment, the mass of any one nucleotide and the combinations thereof, and the sequence specificity of a nucleotide cutter, either enzymatic or chemical cutter, to determine a sequence of a nucleic acid fragment. This method allows for de novo detection of sequences in a target nucleic acid without requiring any prior sequence information. This method is called Partial Sequencing by Fragmentation (PSBF) and it works by fragmenting a target into oligo- or polynucleotides whose masses or lengths are uniquely associated with known sequences. The identities of these sequences are determined solely by the specific fragmentation method used, and are always independent of the target. PSBF can be implemented using electrophoresis, mass spectrometry or any other method that can be used to distinguish the size of the cut nucleic acid sequence fragments.
摘要:
The present invention provides a method for determining nucleic acid sequences of a template nucleic acid that requires no prior knowledge of the nucleic acid sequence present in the template nucleic acid. The method is based on combining information about the mass of a fragment, the mass of any one nucleotide and the combinations thereof, and the sequence specificity of a nucleotide cutter, either enzymatic or chemical cutter, to determine a sequence of a nucleic acid fragment. This method allows for de novo detection of sequences in a target nucleic acid without requiring any prior sequence information. This method is called Partial Sequencing by Fragmentation (PSBF) and it works by fragmenting a target into oligo- or polynucleotides whose masses or lengths are uniquely associated with known sequences. The identities of these sequences are determined solely by the specific fragmentation method used, and are always independent of the target. PSBF can be implemented using electrophoresis, mass spectrometry or any other method that can be used to distinguish the size of the cut nucleic acid sequence fragments.
摘要:
The invention provides methods for dispensing tools that can be employed to generate multi-element arrays of sample material on a substrate surface. The substrates surfaces can be flat or geometrically altered to include wells of receiving material. The tool can dispense a spot of fluid to a substrate surface by spraying the fluid from the pin, contacting the substrate surface or forming a drop that touches against the substrate surface. The tool can form an array of sample material by dispensing sample material in a series of steps, while moving the pin to different locations above the substrate surface to form the sample array. The invention then passes the prepared sample arrays to a plate assembly that disposes the sample arrays for analysis by mass spectrometry. To this end, a mass spectrometer is provided that generates a set of spectra signal which can be understood as indicative of the composition of the sample material under analysis.
摘要:
Methods and kits that use nucleotide analogs to confer increased accuracy and improved resolution in the analysis and sequencing of oligonucleotide mixtures are provided.
摘要:
The invention relates to bis-protein-DNA conjugates. A protein having a specific ligand binding activity is covalently linked to each end of a derivatized DNA molecule. These bis-protein-DNA conjugates can be used for immunoassays, PCR assays and measuring distances between proteins at up to 3.4 A resolution. The invention also relates to methods of synthesizing these bis-protein-DNA conjugates. Synthesis of the conjugates entails derivatizing the 5' or 3' end of a DNA oligonucleotide and covalently linking that DNA to a protein. The DNA can be conjugated to the proteins, including antibodies or Fab' fragments, using disulfide bond linkage.
摘要:
This invention is directed to methods for determining a nucleotide sequence of a nucleic acid using positional sequencing by hybridization, and to the creation of nucleic acids probes which may be used with these methods. This invention is also directed to diagnostic aids for analyzing the nucleic acid composition and content of biological samples, including samples derived from medical and agricultural sources.
摘要:
Described herein are products and processes for nucleic acid quantification, which are in part useful for detecting and determining the nucleotide sequence of rare nucleic acids (i.e., low copy number nucleic acids) in a sample. Such products and processes are useful for reducing the dynamic range among different nucleic acid species.
摘要:
Provided herein are compositions and methods for analysis of nucleic acids, including, methods and compositions for genotyping, haplotyping, sequencing and performing other genetic and epigenetic analysis on nucleic acids, for example. In some embodiments, methods and compositions suitable for whole-genome sequencing on single molecules of nucleic acid are provided. In some embodiments, analysis of single molecules of nucleic acid are performed in conjunction with nanopores and/or nanopore devices.