Nucleic acid amplification using an RNA polymerase and DNA/RNA mixed polymer intermediate products
First Claim
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1. A method of amplifying a target nucleic acid in an aqueous solution with a first and a second primer, said method comprising:
- i.) transcribing an intermediate duplex with a phage-encoded RNA polymerase to form a sense transcription product having a 5′
end and a 3′
end,wherein said intermediate duplex comprises a double-stranded nucleic acid, wherein said double-stranded DNA molecule comprises a first and a second strand,wherein said first strand comprises in the following order from 5′
to 3′
;
a phage-encoded RNA polymerase recognition sequence,a first spacer sequence comprising a sequence of from 12 to 20 nucleotides that consists of one nucleotide type or two different nucleotide types, anda first target complementary sequence which can bind to a segment of said target nucleic acid,wherein said second strand comprises in the following order from 5′
to 3′
;
a second target complementary sequence which can bind to a segment of said target nucleic acid,a second spacer sequence comprising a sequence of from 12 to 20 nucleotides that consists of one nucleotide type or two different nucleotide types, anda phage-encoded RNA polymerase recognition sequence,wherein said transcribing takes place in the presence of Mn++, with all four dNTPs, and with those rNTPs represented in said first spacer sequence;
ii.) hybridizing said second primer to said sense transcription product to form a second primer-sense transcription product complex,wherein said second primer comprises in the following order from 5′
to 3′
;
a phage-encoded RNA polymerase recognition sequence,said second spacer sequence, andsaid second target complementary sequence which can bind to a 3′
segment of said target nucleic acid;
iii.) extending said second primer-sense transcription product complex with a Reverse Transcriptase that lacks RNAseH activity to form a first amplification duplex;
iv.) transcribing said first amplification duplex with a phage-encoded RNA polymerase, in the presence of Mn++, with all four dNTPs, and with those rNTPs represented in said second spacer sequence, to form an antisense transcription product;
v.) hybridizing said first primer to said antisense transcription product to form a first primer-antisense transcription product complex,wherein said first primer comprises in the following order from 5′
to 3′
;
a phage-encoded RNA polymerase recognition sequence,said first spacer sequence, andsaid first target complementary sequence which can bind to a 5′
segment of said target nucleic acid;
vi.) extending said first primer-antisense transcription product complex with a Reverse Transcriptase that lacks RNAseH activity to form a second amplification duplex; and
vii.) transcribing said second amplification duplex with a phage-encoded RNA polymerase, in the presence of Mn++, with all four dNTPs, and with those rNTPs represented in said first spacer sequence to form said sense transcription product.
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Abstract
This invention provides for a novel amplification procedure for nucleic acid. The method uses a wild type or mutant RNA polymerase designed to transcribe both deoxyribonucleotides and ribonucleotides.
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Citations
30 Claims
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1. A method of amplifying a target nucleic acid in an aqueous solution with a first and a second primer, said method comprising:
-
i.) transcribing an intermediate duplex with a phage-encoded RNA polymerase to form a sense transcription product having a 5′
end and a 3′
end,wherein said intermediate duplex comprises a double-stranded nucleic acid, wherein said double-stranded DNA molecule comprises a first and a second strand, wherein said first strand comprises in the following order from 5′
to 3′
;a phage-encoded RNA polymerase recognition sequence, a first spacer sequence comprising a sequence of from 12 to 20 nucleotides that consists of one nucleotide type or two different nucleotide types, and a first target complementary sequence which can bind to a segment of said target nucleic acid, wherein said second strand comprises in the following order from 5′
to 3′
;a second target complementary sequence which can bind to a segment of said target nucleic acid, a second spacer sequence comprising a sequence of from 12 to 20 nucleotides that consists of one nucleotide type or two different nucleotide types, and a phage-encoded RNA polymerase recognition sequence, wherein said transcribing takes place in the presence of Mn++, with all four dNTPs, and with those rNTPs represented in said first spacer sequence; ii.) hybridizing said second primer to said sense transcription product to form a second primer-sense transcription product complex, wherein said second primer comprises in the following order from 5′
to 3′
;a phage-encoded RNA polymerase recognition sequence, said second spacer sequence, and said second target complementary sequence which can bind to a 3′
segment of said target nucleic acid;iii.) extending said second primer-sense transcription product complex with a Reverse Transcriptase that lacks RNAseH activity to form a first amplification duplex; iv.) transcribing said first amplification duplex with a phage-encoded RNA polymerase, in the presence of Mn++, with all four dNTPs, and with those rNTPs represented in said second spacer sequence, to form an antisense transcription product; v.) hybridizing said first primer to said antisense transcription product to form a first primer-antisense transcription product complex, wherein said first primer comprises in the following order from 5′
to 3′
;a phage-encoded RNA polymerase recognition sequence, said first spacer sequence, and said first target complementary sequence which can bind to a 5′
segment of said target nucleic acid;vi.) extending said first primer-antisense transcription product complex with a Reverse Transcriptase that lacks RNAseH activity to form a second amplification duplex; and vii.) transcribing said second amplification duplex with a phage-encoded RNA polymerase, in the presence of Mn++, with all four dNTPs, and with those rNTPs represented in said first spacer sequence to form said sense transcription product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification