Methods for blocking nonspecific hybridizations of nucleic acid sequences
First Claim
1. A method comprising:
- using a blocking reagent to reduce non-specific binding between a first nucleic acid sequence and a second nucleic acid sequence, wherein said blocking reagent comprises at least one modified nucleotide.
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Abstract
Methods are provided for blocking non-specific and specific hybridization of nucleic acid samples on a microarray. The method of the present invention comprises applying a blocking reagent to the microarray, wherein the blocking reagent comprises modified nucleotide bases, preferably LNA (Locked Nucleic Acid—modified bicyclic monomeric units with a 2′-O-4′-C methylene bridge). In further embodiments, the method includes applying a mixture including: a) a cDNA reagent obtained from mRNA of a target sample, the cDNA having a capture sequence; b) a dendrimer with a label for emitting a detectable signal and a second nucleotide sequence complementary to the capture sequence; and c) an blocking reagent containing LNA to a microarray, for producing a detectable signal from said label whereby a hybridization pattern is generated on the microarray.
56 Citations
36 Claims
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1. A method comprising:
using a blocking reagent to reduce non-specific binding between a first nucleic acid sequence and a second nucleic acid sequence, wherein said blocking reagent comprises at least one modified nucleotide. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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1) using a microarray wherein the microarray comprises a plurality of features, each of the features comprising a first set of molecules comprising first nucleotide sequences;
2) applying a sample to said microarray, wherein said sample comprises a second set of molecules comprising second nucleotide sequences for binding to any of said first nucleotide sequences on said microarray that are complementary;
3) using a blocking reagent to reduce non-specific binding between said first nucleotide sequences and said second nucleotide sequences, wherein said blocking reagent comprises a sequence of nucleic acids comprising at least one modified nucleotide. - View Dependent Claims (9, 10, 11)
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12. A method comprising the steps of:
contacting a microarray with a mixture containing an oligonucleotide comprising at least one residue of LNA (Locked Nucleic Acid—
modified bicyclic monomeric units with a 2′
-O-4′
-C methylene bridge), said microarray comprising a plurality of features, said features comprising a first set of nucleotide sequences.- View Dependent Claims (13, 14, 15, 16)
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17. A method comprising:
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1) using a microarray wherein the microarray comprises a plurality of features, said features comprising probe nucleotide sequences;
2) applying a sample to said microarray, wherein said sample comprises target molecules for binding to any of said probe nucleotide sequences on said microarray that are complementary to said target molecules; and
,3) using an LNA reagent as a blocking reagent to reduce non-specific binding between the target and probe molecules, wherein the LNA reagent is an oligonucleotide containing at least one residue of Locked Nucleic Acid, the Locked Nucleic Acid residues being modified bicyclic monomeric units with a 2′
-O-4′
-C methylene bridge. - View Dependent Claims (18, 19, 20, 21)
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22. A method, said method comprising the steps of:
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1) using a microarray comprising a plurality of features, said features comprising a first set of nucleotide sequences;
2) contacting said microarray with a mixture comprising;
a) a first component comprising a cDNA reagent obtained from mRNA of a target sample, said cDNA having a capture sequence;
b) a second component comprising a dendrimer having at least one first arm containing a label for producing a detectable signal and at least one second arm having a second nucleotide sequence complementary to said capture sequence; and
,c) a third component comprising an synthetic DNA oligonucleotide containing residues of LNA (Locked Nucleic Acid—
modified bicyclic monomeric units with a 2′
-O-4′
-C methylene bridge) for use as a blocking reagent on said microarray. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A method for detection and assay on a microarray, said method comprising the steps of:
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1) incubating a mixture including;
a) a first component comprising a cDNA reagent obtained from mRNA of a target sample, said cDNA having a capture sequence; and
b) a second component comprising a dendrimer having at least one first arm containing a label for producing a detectable signal and at least one second arm having a second nucleotide sequence complementary to the capture sequence, said mixture being incubated at a first temperature and for a time sufficient to induce the first component to bind to the second component and form a prehybridized cDNA-dendrimer complex;
2) contacting a microarray with said mixture, wherein said microarray comprises a plurality of features, said features comprising a first set of nucleotide sequences; and
,3) incubating said microarray and said prehybridized cDNA-dendrimer complex at a second temperature and for a time sufficient to induce said prehybridized cDNA-dendrimer complex to bind any of said set of first nucleotide sequences that are complementary to any sequences of said cDNA reagent, wherein such binding results in said feature emitting said detectable signal such that a hybridization pattern is generated on said microarray.
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31. An apparatus comprising:
a kit, said kit comprising a dendrimer and a blocking reagent, said blocking reagent comprising a modified nucleotide. - View Dependent Claims (32, 33, 34, 35, 36)
Specification