Method for analyzing gene expression patterns
First Claim
1. A method of constructing a subarray of distinct gene sequences whose expression levels are specifically related to differences between test cells relative to control cells, comprising:
- (a) obtaining and preparing reporter-labeled copies of messenger nucleic acid from said control cells in a population of control individuals, and from said test cells in a population of test individuals having a shared phenotype that is not present in control individuals, wherein the reporter is compatible with a fluorescence detection system,(b) applying the reporter-labeled nucleic acids from test and control cells to a microarray of distinct gene sequences, under conditions effective to hybridize the reporter-labeled nucleic acids to complementary genes sequences on the microarray, wherein the microarray comprises at least 1000 distinct gene sequences per cm2 and the distinct gene sequences at each position in the microarray correspond to a single nucleic acid molecule of interest and are at least 50 subunits in length, wherein the microarray has a hydrophobic surface formed by the support material or by a coating applied to the support, wherein each said position in the microarray is formed by applying a volume of aqueous reagent solution comprising a distinct gene sequence and wherein said hydrophobic surface prevents spreading of aqueous reagents applied to said surface via reagent bead formation,(c) comparing the pattern of reporter levels for nucleic acids from the test cells with that of nucleic acids from the control cells,(d) identifying those test-cell distinct gene sequences on the microarray which show a significant elevation or reduction in reporter levels, when compared with control reporter levels, and(e) forming a subarray of said test-cell distinct gene sequences.
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Abstract
A method and device for detecting or monitoring the treatment status of a selected physiological state or disease condition. The device has a subarray of genes which show a statistically significant change in gene expression level when compared with the control expression levels for that gene. The method involves applying a reporter-labeled messenger nucleic acid fraction to the array in the device, and comparing the pattern of gene expression on the array with that produced by labeled messenger nucleic acid from control cells. Also disclosed is a method of constructing the array.
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Citations
32 Claims
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1. A method of constructing a subarray of distinct gene sequences whose expression levels are specifically related to differences between test cells relative to control cells, comprising:
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(a) obtaining and preparing reporter-labeled copies of messenger nucleic acid from said control cells in a population of control individuals, and from said test cells in a population of test individuals having a shared phenotype that is not present in control individuals, wherein the reporter is compatible with a fluorescence detection system, (b) applying the reporter-labeled nucleic acids from test and control cells to a microarray of distinct gene sequences, under conditions effective to hybridize the reporter-labeled nucleic acids to complementary genes sequences on the microarray, wherein the microarray comprises at least 1000 distinct gene sequences per cm2 and the distinct gene sequences at each position in the microarray correspond to a single nucleic acid molecule of interest and are at least 50 subunits in length, wherein the microarray has a hydrophobic surface formed by the support material or by a coating applied to the support, wherein each said position in the microarray is formed by applying a volume of aqueous reagent solution comprising a distinct gene sequence and wherein said hydrophobic surface prevents spreading of aqueous reagents applied to said surface via reagent bead formation, (c) comparing the pattern of reporter levels for nucleic acids from the test cells with that of nucleic acids from the control cells, (d) identifying those test-cell distinct gene sequences on the microarray which show a significant elevation or reduction in reporter levels, when compared with control reporter levels, and (e) forming a subarray of said test-cell distinct gene sequences. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of determining the relative amounts of a polynucleotide in first and second mixtures of polynucleotides, comprising:
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(a) labeling the polynucleotides from the first and second mixtures with first and second reporters, respectively, where the first and second reporters are independently detectable and are compatible with a fluorescence detection system, (b) concurrently contacting both mixtures of labeled polynucleotides, under hybridization conditions, with a microarray of distinct polynucleotides located at discrete positions on the surface of a substrate comprising a density of about 1,000 or more positions per cm2, wherein the distinct polynucleotides at each position in the microarray correspond to a single nucleic acid molecule of interest and are at least 50 subunits in length, wherein the microarray has a hydrophobic surface formed by the support material or by a coating applied to the support, wherein each said position in the microarray is formed by applying a volume of aqueous reagent solution comprising a distinct gene sequence and wherein said hydrophobic surface prevents spreading of aqueous reagents applied to said surface via reagent bead formation, and (c) detecting fluorescence associated with the first and second reporters at each position in the microarray as a measure of the relative amounts of the corresponding polynucleotides in the first and second mixtures. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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Specification