Method, test element and test kit for semi-quantitative detection of target nucleic acid
First Claim
1. A method for the semi-quantitative determination of a target nucleic acid comprising:
- A) contacting a target nucleic acid having a specific binding ligand bound thereto with a water-insoluble support having affixed thereon a multiplicity of detection deposits,each detection deposit comprising a mixture of water-insoluble first and second particles,said first particles having affixed thereto a capture probe which is specific to and hybridizable with said target nucleic acid, andsaid second particles being free of all capture probes,said multiplicity of detection deposits having a varying weight ratio of said first particles to said second particles, but all of said detection deposits having about the same total weight of polymeric particles and the same configuration,to capture said target nucleic acid strand on said detection deposits in proportion to the amount of said first particles in each detection deposit,B) contacting said captured target nucleic acid strand in said detection deposits with a receptor for said specific binding ligand, said receptor being labeled with a reporter molecule,to complex said reporter labeled receptor with said captured target nucleic acid strand and thereby capture said reporter labeled receptor on each of said detection deposits in proportion to the amount of captured ligand labeled target nucleic acid strand in each of said detection deposits, andC) detecting the reporter molecules on said detection deposits as a semi-quantitative determination of the presence of said target nucleic acid in a range of 0.08 to 1.25 pmol/ml nucleic acid.
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Accused Products
Abstract
A target nucleic acid can be detected in a semi-quantitative fashion by passing it over detection deposits in a test element. The detection deposits include particles affixed to the test element, some of which particles have capture probe attached thereto, and other particles having no capture probe. The deposits have varying amounts of capture probe so that the signal obtained when the target nucleic acid is captured thereon can be semi-quantitatively correlated to the amount of target nucleic acid in the specimen. This method of detection can be used in nucleic acid hybridization assays or following amplification methods, including polymerase chain reaction.
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Citations
20 Claims
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1. A method for the semi-quantitative determination of a target nucleic acid comprising:
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A) contacting a target nucleic acid having a specific binding ligand bound thereto with a water-insoluble support having affixed thereon a multiplicity of detection deposits, each detection deposit comprising a mixture of water-insoluble first and second particles, said first particles having affixed thereto a capture probe which is specific to and hybridizable with said target nucleic acid, and said second particles being free of all capture probes, said multiplicity of detection deposits having a varying weight ratio of said first particles to said second particles, but all of said detection deposits having about the same total weight of polymeric particles and the same configuration, to capture said target nucleic acid strand on said detection deposits in proportion to the amount of said first particles in each detection deposit, B) contacting said captured target nucleic acid strand in said detection deposits with a receptor for said specific binding ligand, said receptor being labeled with a reporter molecule, to complex said reporter labeled receptor with said captured target nucleic acid strand and thereby capture said reporter labeled receptor on each of said detection deposits in proportion to the amount of captured ligand labeled target nucleic acid strand in each of said detection deposits, and C) detecting the reporter molecules on said detection deposits as a semi-quantitative determination of the presence of said target nucleic acid in a range of 0.08 to 1.25 pmol/ml nucleic acid. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for the amplification and semi-quantitative determination of a target nucleic acid comprising:
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A) amplifying opposing strands of a target nucleic acid with a DNA polymerase, more than one dNTP and a set of two primers specific to and hybridizable with said opposing strands, one of said primers being labeled with a specific binding ligand, thereby providing at least one amplified ligand labeled strand of said target nucleic acid, B) contacting said amplified ligand labeled target nucleic acid strand with a water-insoluble support having affixed thereon a multiplicity of detection deposits, each detection deposit comprising a mixture of water-insoluble first and second particles, said first particles having affixed thereto a capture probe which is specific to and hybridizable with said ligand labeled target nucleic acid strand, and said second particles being free of all capture probes, said multiplicity of detection deposits having a varying weight ratio of said first particles to said second particles, but all of said detection deposits having about the same total weight of polymeric particles and the same configuration, to capture said ligand labeled target nucleic acid strand on said detection deposits in proportion to the amount of said first particles in each detection deposit, C) contacting said captured ligand labeled target nucleic acid strand in said detection deposits with a receptor for said specific binding ligand, said receptor being labeled with a reporter molecule, to complex said reporter labeled receptor with said captured ligand labeled target nucleic acid strand and thereby capture said reporter labeled receptor on each of said detection deposits in proportion to the amount of captured ligand labeled target nucleic acid strand in each of said detection deposits, and D) detecting the reporter molecules on said detection deposits as a semi-quantitative determination of the presence of said target nucleic acid in a range of 0.08 to 1.25 pmol/ml nucleic acid. - View Dependent Claims (8, 9, 10, 11)
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12. A test element comprising a water-insoluble support having affixed thereon a multiplicity of detection deposits,
each detection deposit comprising a mixture of water-insoluble first and second particles, said first particles having affixed thereto a capture probe which is specific to and hybridizable with a ligand labeled target nucleic acid, and said second particles being free of capture probes, said multiplicity of detection deposits having a varying weight ratio of said first particles to said second particles, but all of said detection deposits having about the same total weight of polymeric particles and the same configuration.
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17. A kit for the detection of a target nucleic acid labeled with a specific binding ligand comprising:
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a) either an amplification reagent, or a reporter labeled receptor for said specific binding ligand, and b) a test element comprising a water-insoluble support having affixed thereon a multiplicity of detection deposits, each detection deposit comprising a mixture of water-insoluble first and second particles, said first particles having affixed thereto a capture probe which is specific to and hybridizable with a ligand labeled target nucleic acid, and said second particles being free of capture probes, said multiplicity of detection deposits having a varying weight ratio of said first particles to said second particles, but all of said detection deposits having about the same total weight of polymeric particles and the same configuration. - View Dependent Claims (18, 19, 20)
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Specification