Continuous amplification reaction
First Claim
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1. A method of amplifying a target nucleic acid comprising the steps of:
- providing a single-stranded nucleic acid containing a target region;
hybridizing the target region of said nucleic acid to a promoter-primer having a central promoter portion and two regions homologous to non-contiguous portions of the target region forming a circular hybrid;
trimming back single-stranded sequence 3'"'"'to the target region generating a flushed 3'"'"' end of said hybrid;
extending 3'"'"' ends of the target region and the promoter-primer forming a double-stranded intermediate; and
transcribing the double-stranded intermediate producing many RNA transcripts from each target region.
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Abstract
Continuous amplification reaction provide a method of amplifying a specific nucleic acid without the need to cycle a reaction. The method produces RNA transcripts which can be detected by a variety of methods. Amplification and detection kits are also provided.
218 Citations
26 Claims
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1. A method of amplifying a target nucleic acid comprising the steps of:
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providing a single-stranded nucleic acid containing a target region; hybridizing the target region of said nucleic acid to a promoter-primer having a central promoter portion and two regions homologous to non-contiguous portions of the target region forming a circular hybrid; trimming back single-stranded sequence 3'"'"'to the target region generating a flushed 3'"'"' end of said hybrid; extending 3'"'"' ends of the target region and the promoter-primer forming a double-stranded intermediate; and transcribing the double-stranded intermediate producing many RNA transcripts from each target region. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of detecting a nucleic acid containing a target region comprising the steps of:
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providing a single-stranded nucleic acid comprising said target region; hybridizing said nucleic acid to a single stranded promoter-primer having a 5'"'"' primer portion and a 3'"'"' promoter portion, said 3'"'"' primer portion comprising a sequence complementary to a 3'"'"' portion of said target region, said 3'"'"' primer portion further comprising at least one modified nucleotide or modified phosphodiester linkage to resist exonuclease activity, to form a hybrid; trimming back single-stranded sequence 3'"'"' to the target with an exonuclease activity, thereby generating a flushed 3'"'"' end of said hybrid; extending 3'"'"' ends of said target region and the promoter-primer forming a double-stranded intermediate; transcribing the double-stranded intermediate producing many RNA transcripts from each target region; and detecting RNA transcripts. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A kit for amplification of nucleic acid in a biological sample comprising:
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a promoter-primer having a central promoter portion and two regions homologous to non-contiguous sequences in the target region; a trimming back agent; a nucleic acid polymerase; an RNA polymerase; and a sample transport medium for stabilization of the biological sample. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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20. A kit for amplification of nucleic acid in a biological sample comprising:
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a promoter-primer having a 5'"'"' promoter portion and a 3'"'"' primer portion, said primer portion comprising a sequence complementary to a 3'"'"' portion of said target region, said promoter-primer further comprising at least one modified nucleotide or phosphodiester linkage to resist exonuclease activity; a trimming back agent comprising an exonuclease activity; a nucleic acid polymerase; a RNA polymerase; and a sample transport medium for stabilization of the biological sample.
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Specification