Optimally fluorescent oligonucleotides
First Claim
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1. An oligonucleotide comprising a nucleotide repeat region having the formula:
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space="preserve" listing-type="equation">(N.sub.m N.sup.f)wherein N represents any nucleotide which is not conjugated to a fluorescent dye moiety, Nf represents a nucleotide conjugated to a fluorescent dye moiety, and m is an integer from 1 to 11, and wherein for each said repeat Nf and the fluorescent moiety are the same, and further wherein m and said fluorescent dye moiety are selected such that said oligonucleotide exhibits maximum specific fluorescence.
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Abstract
A method for the preparation of optimally fluorescent oligonucleotides wherein fluorescent dye-conjugated nucleotide triphosphates are incorporated into a nucleic acid sequence in a defined repetitive manner which allows for the optimal specific fluorescence of the oligonucleotide. The oligonucleotides of the present invention are useful in the assay of a wide variety of nucleic acid sequences, specifically wherever highly fluorescent nucleic acid probes are desired.
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14 Claims
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1. An oligonucleotide comprising a nucleotide repeat region having the formula:
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space="preserve" listing-type="equation">(N.sub.m N.sup.f)wherein N represents any nucleotide which is not conjugated to a fluorescent dye moiety, Nf represents a nucleotide conjugated to a fluorescent dye moiety, and m is an integer from 1 to 11, and wherein for each said repeat Nf and the fluorescent moiety are the same, and further wherein m and said fluorescent dye moiety are selected such that said oligonucleotide exhibits maximum specific fluorescence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An oligonucleotide containing a single fluorescent dye moiety and prepared by a method comprising:
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(a) preparing a primer; (b) preparing a template oligonucleotide, said template oligonucleotide containing a nucleotide sequence complementary to said primer, and a nucleotide repeat region downstream from said complementary nucleotide sequence, said nucleotide repeat region having the formula;
space="preserve" listing-type="equation">(N.sub.m N.sup.t)wherein m is an integer from 1 to 11, N is a nucleotide which cannot form a base pair with a fluorescent dye-conjugated nucleotide triphosphate, and Nt is a nucleotide which can form a base pair with the fluorescent dye-conjugated nucleotide triphosphate, wherein for each repeat, Nt is the same; (c) annealing the template and the primer in a reaction medium comprising a polymerase, unlabeled nucleotide triphosphates and a predetermined concentration of said fluorescent dye-conjugated nucleotide triphosphate, wherein said polymerase and m are chosen to cause said optimally fluorescent oligonucleotide to exhibit maximum specific fluorescence; (d) initiating synthesis of a complementary strand on the template which defines said optimally fluorescent oligonucleotide; and (e) isolating said oligonucleotide from the reaction medium, wherein m, said fluorescent dye moiety, and said polymerase are selected such that said oligonucleotide exhibits maximum specific fluorescence. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification