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Heterogeneous assay for pyrophosphate detection

  • US 6,232,075 B1
  • Filed: 12/13/1999
  • Issued: 05/15/2001
  • Est. Priority Date: 12/14/1998
  • Status: Expired due to Term
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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