Recombinase polymerase amplification
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Abstract
This disclosure describe three related novel methods for Recombinase-Polymerase Amplification (RPA) of a target DNA that exploit the properties of the bacterial RecA and related proteins, to invade double-stranded DNA with single stranded homologous DNA permitting sequence specific priming of DNA polymerase reactions. The disclosed methods has the advantage of not requiring thermocycling or thermophilic enzymes. Further, the improved processivity of the disclosed methods allow amplification of DNA up to hundreds of megabases in length.
34 Citations
90 Claims
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1-72. -72. (canceled)
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73. A method of recombinase-polymerase amplification of a target sequence polymer molecule, comprising:
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(a) contacting a recombinase agent with a first primer sequence molecule to form a first recombinase agent-primer pair and contacting a recombinase agent with a second primer sequence molecule to form a second recombinase agent-primer pair;
(b) contacting the first recombinase agent-primer pair with the target sequence polymer molecule to form a structure, wherein the first primer sequence molecule of the first recombinase agent-primer pair associates with the target sequence polymer molecule;
(c) extending the first primer sequence molecule along the target sequence polymer molecule with a polymerase molecule and monomers to be incorporated into the extended first primer sequence molecule, using the target sequence polymer molecule as a template;
(d) contacting the second recombinase agent-primer pair with the resulting molecule of step (c) to form a structure, wherein the second primer sequence molecule of the second recombinase agent-primer pair associates with the extended first primer sequence molecule;
(e) extending the second primer sequence molecule along the target sequence polymer molecule with a polymerase molecule and monomers to be incorporated into the extended second primer sequence molecule, using the extended first primer sequence molecule as a template; and
(f) repeating steps (b) though (e) until a desired degree of amplification is achieved, wherein the polymerase molecule is capable of displacing the recombinase agent during extension. - View Dependent Claims (76, 77, 78, 79, 80, 81, 82)
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74. A method of recombinase-polymerase amplification of a double-stranded target sequence polymer molecule, comprising:
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(a) contacting a recombinase agent with a first primer sequence molecule to form a first recombinase agent-primer pair and contacting a recombinase agent with a second primer sequence molecule to form a second recombinase agent-primer pair;
(b) contacting the first and second recombinase agent-primer pairs with the double-stranded target sequence polymer molecule to form a structure, wherein the first and second primer sequence molecules of the recombinase agent-primer pairs associate with the double-stranded target sequence polymer molecule;
(c) extending the first and second primer sequence molecules along the double-stranded target sequence polymer molecule with a polymerase molecule and monomers to be incorporated into the extended first and second primer sequence molecules, using the double-stranded target sequence polymer molecule as a template; and
(d) repeating steps (b) and (c) until a desired degree of amplification is achieved, wherein the polymerase molecule is capable of displacing the recombinase agent during extension.
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75. A method of recombinase-polymerase amplification of a double-stranded target sequence polymer molecule, comprising:
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(a) contacting a recombinase agent with a first primer sequence molecule to form a first recombinase agent-primer pair and contacting a recombinase agent with a second primer sequence molecule to form a second recombinase agent-primer pair;
(b) contacting the first and second recombinase agent-primer pairs with the double-stranded target sequence polymer molecule to form a structure, wherein the first and second primer sequence molecules of the recombinase agent-primer pairs associate with the double-stranded target sequence polymer molecule;
(c) extending the first and second primer sequence molecules along the double-stranded target sequence polymer molecule with a polymerase molecule and monomers to be incorporated into the extended first and second primer sequence molecules, using the double-stranded target sequence polymer molecule as a template;
(d) contacting the double-stranded target sequence polymer molecule with primosome assembly proteins, a clamp loader/polymerase III holoenzyme complex, a DNA polymerase III core, a DNA polymerase I, a primase, a helicase, and a ligase;
(e) replicating the strand of the double-stranded target sequence polymer molecule that is displaced by the recombinase agent-primer pair structures through lagging strand synthesis; and
(f) repeating steps (b) through (e) until a desired degree of amplification is achieved.
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- 83. A recombinase-polymerase amplification mixture of substantially purified components, comprising a target sequence polymer molecule, a recombinase agent, a primer sequence molecule, a polymerase molecule, wherein the polymerase molecule is capable of displacing the recombinase agent during an extension reaction.
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84. A recombinase-polymerase amplification mixture of substantially purified components, comprising a non-natural target sequence polymer molecule, a recombinase agent, a primer sequence molecule, and a polymerase molecule.
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85. A recombinase-polymerase amplification mixture of substantially purified components, comprising a target sequence polymer molecule, a recombinase agent, a primer sequence molecule, a polymerase molecule, primosome assembly proteins, a clamp loader/polymerase III holoenzyme complex, a DNA polymerase III core, a DNA polymerase I, a primase, a helicase, and a ligase.
Specification