Process for identifying nucleic acids and triple helices formed thereby
First Claim
1. A process for identifying the presence of a subregion within a large double-helical nucleic acid, comprising the steps of:
- (a) contacting a double-helical nucleic acid comprising first and second strands with an oligonucleotide under conditions which permit the formation of a triple-helix when said subregion is present in said double-helical nucleic acid, wherein said oligonucleotide contains at least one nucleoside to which is attached at least one moiety capable of being detected when bound to said subregion, wherein when said oligonucleotide is bound in a parallel orientation to said first strand, said oligonucleotide comprises a T or a C+ bound to an A or G respectively, on said first strand; and
(b) detecting said moiety as an indication of the presence of said subregion within said double-helical nucleic acid.
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Abstract
Probes and processes for their use for specific recognition and/or cleavage of double-stranded DNA or RNA at sequence specific desired loci through the intermediacy of a triple helix are disclosed. These probes may also be used as diagnostic chemotherapeutic agents through incorporation of a radiolabeled, fluorescing, or otherwise detectable molecule. Preferred assay conditions are also provided for recognition of homopurine-homopyrimidine double-helical tracts within large DNA by triple helix formation under physiological conditions. Hybridization probes for double-stranded recognition with binding site sizes that range >8 base pairs are also provided.
39 Citations
34 Claims
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1. A process for identifying the presence of a subregion within a large double-helical nucleic acid, comprising the steps of:
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(a) contacting a double-helical nucleic acid comprising first and second strands with an oligonucleotide under conditions which permit the formation of a triple-helix when said subregion is present in said double-helical nucleic acid, wherein said oligonucleotide contains at least one nucleoside to which is attached at least one moiety capable of being detected when bound to said subregion, wherein when said oligonucleotide is bound in a parallel orientation to said first strand, said oligonucleotide comprises a T or a C+ bound to an A or G respectively, on said first strand; and (b) detecting said moiety as an indication of the presence of said subregion within said double-helical nucleic acid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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- 12. Nucleic acid comprising a large double-helical nucleic acid comprising first and second strands, and an oligonucleotide bound to a double helical subregion of said nucleic acid to form a triple-helix, wherein when said oligonucleotide is bound in a parallel orientation to said first strand, said oligonucleotide comprises a T or a C+ bound to an A or G respectively, on said first strand, said oligonucleotide comprising at least one modified nucleotide containing a moiety capable of being detected when bound to said subregion.
- 21. A triple helix comprising a large double-helical nucleic acid comprising first and second strands and an oligonucleotide bound to a specific sequence within said nucleic acid, wherein when said oligonucleotide is bound in a parallel orientation to said first strand, said oligonucleotide comprises a T or a C+ bound to an A or G respectively, on said first strand.
- 30. A process for forming a triple helix comprising contacting a large double-helical nucleic acid comprising first and second strands with an oligonucleotide under conditions which permit the formation of a triple-helix wherein said oligonucleotide is bound to a specific sequence within said double-helical nucleic acid, and wherein when said oligonucleotide is bound in a parallel orientation to said first strand, said oligonucleotide comprises a T or a C+ bound to an A or G respectively, on said first strand.
Specification