Abstract:
Disclosed herein are methods for array assembly and detection. The methods can use an incubation chamber containing a suspension of nucleic acid targets, polymerase and a set of oligonucleotide probes bound to magnetic beads in a randomly dispersed state. Each probe can have a target binding domain that is complementary to a target nucleic acid, a closing domain with a sequence that is complementary to the sequence of the target binding domain, and a joining region between the binding domain and the closing domain, which is not complementary to the target nucleic acid. Method steps can include providing the incubation chamber, placing the incubation chamber in a magnetic trap, generating a magnetic field that induces the magnetic beads to migrate towards a substrate and, once in proximity to the substrate, to interact with each other repulsively and reorganize into arrays, and imaging the array.
Abstract:
This invention provides high unit density arrays of microparticles and methods of assembling such arrays. The microparticles in the arrays may be functionalized with chemical or biological entities specific to a given target analyte. The high unit density arrays of this invention are formed on chips which may be combined to form multichip arrays according to the methods described herein. The chips and/or multichip arrays of this invention are useful for chemical and biological assays.
Abstract:
This invention provides high unit density arrays of microparticles and methods of assembling such arrays. The microparticles in the arrays may be functionalized with chemical or biological entities specific to a given target analyte. The high unit density arrays of this invention are formed on chips which may be combined to form multichip arrays according to the methods described herein. The chips and/or multichip arrays of this invention are useful for chemical and biological assays.
Abstract:
Disclosed are methods of multiplexed analysis of oligonucleotides in a sample, including a method of preventing a significant reduction in duplexes detectable in a hybridization assay involving (i) selecting probe lengths for sets of oligonucleotide probes, wherein probes include different subsequences such that at least one subsequence is complementary to a subsequence in a cognate target; wherein probes for longer cognate targets are longer in length than probes for shorter cognate targets, (ii) selecting, for each set of probes, a density of oligonucleotides probes attached per unit area on a solid phase carrier which is below a limit at which the significant reduction in detectable duplexes is predicated to take place, (iii) producing the probes and affixing them to different solid phase carriers at the selected density, and (iv) annealing targets to the probes, wherein signal intensities of probes and targets of different lengths are about the same.
Abstract:
Disclosed are methods of multiplexed analysis of oligonucleotides in a sample, including a method of preventing a significant reduction in duplexes detectable in a hybridization assay involving (i) selecting probe lengths for sets of oligonucleotide probes, wherein probes include different subsequences such that at least one subsequence is complementary to a subsequence in a cognate target; wherein probes for longer cognate targets are longer in length than probes for shorter cognate targets, (ii) selecting, for each set of probes, a density of oligonucleotides probes attached per unit area on a solid phase carrier which is below a limit at which the significant reduction in detectable duplexes is predicated to take place, (iii) producing the probes and affixing them to different solid phase carriers at the selected density, and (iv) annealing targets to the probes, wherein signal intensities of probes and targets of different lengths are about the same.
Abstract:
Disclosed are methods of multiplexed analysis of oligonucleotides in a sample, including: methods of probe and target “engineering”, as well as methods of assay signal analysis relating to the modulation of the probe-target affinity constant, K by a variety of factors including the elastic properties of target strands and layers of immobilized (“grafted”) probes; and assay methodologies relating to: the tuning of assay signal intensities including dynamic range compression and on-chip signal amplification; the combination of hybridization-mediated and elongation-mediated detection for the quantitative determination of abundance of messages displaying a high degree of sequence similarity, including, for example, the simultaneous determination of the relative expression levels, and identification of the specific class of, untranslated AU-rich subsequences located near the 3′ terminus of mRNA; and a new method of subtractive differential gene expression analysis which requires only a single color label.
Abstract:
The present invention provides a method for the generation of novel libraries of encoded magnetic particles from sub-libraries of by the generation of novel sub-libraries of magnetic nanoparticles and encoded particles. The sub-libraries are functionalized on demand are useful in the formation of arrays. The present invention is especially useful for performing multiplexed (parallel) assays for qualitative and/or quantitative analysis of binding interations of a number of analyte molecules in a sample.
Abstract:
This invention provides high unit density arrays of microparticles and methods of assembling such arrays. The microparticles in the arrays may be functionalized with chemical or biological entities specific to a given target analyte. The high unit density arrays of this invention are formed on chips which may be combined to form multichip arrays according to the methods described herein. The chips and/or multichip arrays of this invention are useful for chemical and biological assays.
Abstract:
This invention provides high unit density arrays of microparticles and methods of assembling such arrays. The microparticles in the arrays may be functionalized with chemical or biological entities specific to a given target analyte. The high unit density arrays of this invention are formed on chips which may be combined to form multichip arrays according to the methods described herein. The chips and/or multichip arrays of this invention are useful for chemical and biological assays.
Abstract:
Disclosed are methods of multiplexed analysis of oligonucleotides in a sample, including a method of preventing a significant reduction in duplexes detectable in a hybridization assay involving (i) selecting probe lengths for sets of oligonucleotide probes, wherein probes include different subsequences such that at least one subsequence is complementary to a subsequence in a cognate target; wherein probes for longer cognate targets are longer in length than probes for shorter cognate targets, (ii) selecting, for each set of probes, a density of oligonucleotides probes attached per unit area on a solid phase carrier which is below a limit at which the significant reduction in detectable duplexes is predicated to take place, (iii) producing the probes and affixing them to different solid phase carriers at the selected density, and (iv) annealing targets to the probes, wherein signal intensities of probes and targets of different lengths are about the same.