DNA polymerase having ability to reduce innate selective discrimination against fluorescent dye-labeled dideoxynucleotides
First Claim
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1. A method of sequencing a DNA strand comprising the steps of:
- i) hybridizing a primer to a DNA template to be sequenced;
ii) extending the primer using a modified DNA polymerase in the presence of adequate amounts of nucleotide bases dATP, dGTP, dCTP and dTTP, or their analogs, and fluorescent dye-labeled dideoxynucleotide terminators, wherein the modified DNA polymerase during DNA sequencing effectively incorporates fluorescent dye-labeled dideoxynucleotide terminators ddCTP, ddATP, ddTTP and ddGTP, and their analogs, and reduces selective discrimination against incorporation of fluorescent dye-labeled dideoxynucleotide terminators ddCTP and ddATP, which DNA polymerase in its unmodified state selectively discriminates against incorporation of fluorescent dye-labeled dideoxynucleotide terminators ddCTP and ddATP but does not discriminate against incorporation of fluorescent dye-labeled dideoxynucleotide terminators ddTTP and ddGTP, under such conditions that the DNA strand is sequenced.
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Abstract
The invention relates to genetical modification of DNA polymerase to reduce its innate selective sequence-related discrimination against incorporation of fluorescent dye-labeled ddCTP and ddATP in the enzymatic reaction for preparation of samples for automated florescent dye-labeled terminator DNA sequencing. The modified DNA polymerases are more resistant to heat inactivation and are more effective in dideoxynucleotide incorporation than current DNA polymerases.
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Citations
26 Claims
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1. A method of sequencing a DNA strand comprising the steps of:
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i) hybridizing a primer to a DNA template to be sequenced;
ii) extending the primer using a modified DNA polymerase in the presence of adequate amounts of nucleotide bases dATP, dGTP, dCTP and dTTP, or their analogs, and fluorescent dye-labeled dideoxynucleotide terminators, wherein the modified DNA polymerase during DNA sequencing effectively incorporates fluorescent dye-labeled dideoxynucleotide terminators ddCTP, ddATP, ddTTP and ddGTP, and their analogs, and reduces selective discrimination against incorporation of fluorescent dye-labeled dideoxynucleotide terminators ddCTP and ddATP, which DNA polymerase in its unmodified state selectively discriminates against incorporation of fluorescent dye-labeled dideoxynucleotide terminators ddCTP and ddATP but does not discriminate against incorporation of fluorescent dye-labeled dideoxynucleotide terminators ddTTP and ddGTP, under such conditions that the DNA strand is sequenced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of dye-labeled primer sequencing of a DNA strand comprising the steps of:
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i) hybridizing a fluorescent dye-labeled primer to a DNA template to be sequenced;
ii) extending the primer using a modified DNA polymerase in the presence of adequate amounts of nucleotide bases dATP, dGTP, dCTP and dTTP, or their analogs, and dideoxynucleotide terminators, wherein the modified DNA polymerase during DNA sequencing effectively incorporates fluorescent dye-labeled dideoxynucleotide terminators ddCTP, ddATP, ddTTP and ddGTP, and their analogs, and reduces selective discrimination against incorporation of fluorescent dye-labeled dideoxynucleotide terminators ddCTP and ddATP, which DNA polymerase in its unmodified state selectively discriminates against incorporation of fluorescent dye-labeled dideoxynucleotide terminators ddCTP and ddATP but does not discriminate against incorporation of fluorescent dye-labeled dideoxynucleotide terminators ddTTP and ddGTP, under such conditions that the DNA strand is sequenced. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method of ralioiostope-labeled sequencing a DNA strand comprising the steps of:
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i) providing four separate tubes, each containing DNA template to be sequenced, a primer, dATP, dTTP, dCTP and dGTP, wherein one of dATP, dTTP, dCTP or dGTP is labeled with a radioisotope, and a modified DNA polymerase which during DNA sequencing effectively incorporates fluorescent dye-labeled dideoxynucleotide terminators ddCTP, ddATP, ddTTP and ddGTP, and their analogs, and reduces selective disc nation against incorporation of fluorescent dye-labeled dideoxynucleotide terminators ddCTP and ddATP, which DNA polymerase in its unmodified state selectively discriminates against incorporation of fluorescent dye-labeled dideoxynucleotide terminators ddCTP and ddATP but does not discriminate against incorporation of fluorescent dye-labeled dideoxynucleotide terminators ddTTP and ddGTP, wherein each tube contains an appropriate amount of one of dATP, dTTP, dCTP or dGTP;
ii) allowing DNA sequencing of the DNA template to be carried out; and
iii) determining the sequence of the DNA template. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification