Heterogeneous assay for pyrophosphate detection
First Claim
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1. A heterogeneous assay method for detecting pyrophosphate cleavage, the components of the assay comprising a labeled NTP, a target nucleic acid, a primer nucleic acid and a polymerase, said method comprising:
- (a) flowing said labeled nucleotide triphosphate (NTP) consisting of a γ
-phosphate with a fluorophore moiety attached thereto and a quencher moiety sufficiently proximal to said fluorophore moiety to prevent fluorescence of said fluorophore moiety past an immobilized component selected from the group consisting of said polymerase and said target nucleic acid;
(b) incorporating said NTP on a primer strand hybridized to said target nucleic acid using said polymerase and releasing said γ
-phosphate with said fluorophore moiety attached thereto; and
(c) detecting said fluorescent moiety thereby detecting pyrophosphate cleavage.
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Abstract
Nucleotide triphosphate probes containing a fluorophore attached to the β-phosphate and a quencher moiety sufficiently proximal to the fluorophore moiety for use in pyrophosphate detection assays are disclosed. These probes exhibit distinguishable fluorescence characteristics when the fluorophore is attached to the nucleotide through the γ-phosphate and when it is unattached to the nucleotide. The present invention also provides kits and integrated systems for practicing the assays described herein.
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Citations
30 Claims
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1. A heterogeneous assay method for detecting pyrophosphate cleavage, the components of the assay comprising a labeled NTP, a target nucleic acid, a primer nucleic acid and a polymerase, said method comprising:
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(a) flowing said labeled nucleotide triphosphate (NTP) consisting of a γ
-phosphate with a fluorophore moiety attached thereto and a quencher moiety sufficiently proximal to said fluorophore moiety to prevent fluorescence of said fluorophore moiety past an immobilized component selected from the group consisting of said polymerase and said target nucleic acid;
(b) incorporating said NTP on a primer strand hybridized to said target nucleic acid using said polymerase and releasing said γ
-phosphate with said fluorophore moiety attached thereto; and
(c) detecting said fluorescent moiety thereby detecting pyrophosphate cleavage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A nucleotide triphosphate (NTP) probe, said NTP probe consisting of:
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a NTP having a γ
-phosphate with a fluorophore moiety attached thereto;
a quencher moiety sufficiently proximal to said fluorophore moiety to prevent fluorescence of said fluorophore moiety;
wherein said fluorophore moiety exists quenched with at least about a 5 fold quenching efficiency when said γ
-phosphate is attached to said NTP and unquenched when said γ
-phosphate is detached from said NTP.- View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A kit for assaying pyrophosphate cleavage, said kit comprising:
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(a) a plurality of NTPs each cosisting of a γ
-phosphate with a distinguishing fluorophore moiety attached thereto and each having a quencher moiety sufficiently proximal to said distinguishing fluorophore moiety to prevent fluorescence of said distinguishing fluorophore moiety;
wherein said distinguishing fluorophore moiety exists quenched with at least about a 5 fold quenching efficiency when said γ
-phosphate is attached to each of said plurality of dNTP moieties and each is unquenched when said γ
-phosphate is detached from each of said plurality of dNTP moieties; and
(b) a polymerase. - View Dependent Claims (30)
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Specification