Arrays with modified oligonucleotide and polynucleotide compositions
First Claim
1. An array comprising a plurality of modified oligonucleotide compositions stably associated with the surface of a support, wherein each oligonucleotide composition is characterized by:
- an oligonucleotide backbone structure modified from that of a naturally occurring nucleotide polymer, comprising at least one p-ethoxy internucleoside linkage, wherein the oligonucleotides of the composition are characterized by a binding affinity greater than that of a corresponding, non-modified oligonucleotide, wherein the oligonucleotides are further characterized by a pH stability of at least one hour at 37°
C. at a pH range of about 0.5 to about 6.0; and
wherein the oligonucleotides of the composition selectively hybridize to DNA.
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Abstract
The present invention provides arrays having associated modified oligonucleotides that selectively bind to DNA or RNA, methods of making such arrays, assays for using such arrays, and the like. In one embodiment, the arrays of the invention exhibit an increased binding affinity with complementary nucleic acids, and in particular with complementary RNA. In another embodiment, the associated nucleic acids of the array of the invention exhibit substantial acid resistance, allowing the arrays to be treated with low pH solutions. In another embodiment, the modified associated nucleic acids of the array of the invention exhibit substantial resistance to nuclease degradation.
41 Citations
18 Claims
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1. An array comprising a plurality of modified oligonucleotide compositions stably associated with the surface of a support, wherein each oligonucleotide composition is characterized by:
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an oligonucleotide backbone structure modified from that of a naturally occurring nucleotide polymer, comprising at least one p-ethoxy internucleoside linkage, wherein the oligonucleotides of the composition are characterized by a binding affinity greater than that of a corresponding, non-modified oligonucleotide, wherein the oligonucleotides are further characterized by a pH stability of at least one hour at 37°
C. at a pH range of about 0.5 to about 6.0; and
wherein the oligonucleotides of the composition selectively hybridize to DNA. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 18)
a) contacting said sample with the array of claim 1;
b) allowing the DNA in the biological sample to hybridize to a modified sequence of the array; and
c) analyzing the results of the hybridizing.
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18. The method of claim 16 or 17 further comprising:
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d) removing sequences hybridized to sequences of the array using a removing agent selected from the group consisting of a solution having a pH of less than 6.0 and a nuclease which enzymatically destroys natural nucleic acid sequences; and
e) repeating (a), (b), (c) and (d) with a second biological sample.
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2. An array comprising a plurality of modified oligonucleotide compositions stably associated with the surface of a support, wherein each oligonucleotide composition is characterized by:
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an oligonucleotide backbone structure modified from that of a naturally occurring nucleotide polymer, comprising at least one 2′
-5′
-internucleoside linkage and one 3′
-O-methyl substituent,wherein the oligonucleotides of the composition are characterized by a binding affinity greater than that of a corresponding, non-modified oligonucleotide, wherein the oligonucleotides are further characterized by a pH stability of at least one hour at 37°
C. at a pH range of about 0.5 to about 6.0; and
wherein the oligonucleotides of the composition selectively hybridize to RNA. - View Dependent Claims (14, 15, 17)
a) contacting said sample with the array of claim 2;
b) allowing the DNA in the biological sample to hybridize to a modified sequence of the array; and
c) analyzing the results of the hybridizing.
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Specification