Isolation and amplification of nucleic acid materials
First Claim
1. A method for separating single stranded nucleic acid from double stranded nucleic acid, comprising the steps of:
- contacting a mixture comprising both single stranded nucleic acid and double stranded nucleic acid with a first liquid comprising a chaotropic agent and a nucleic acid binding solid phase, wherein the first liquid has a composition such that the double stranded nucleic acid binds to the solid phase;
separating the solid phase from a supernatant containing the single stranded nucleic acid; and
contacting the supernatant with a second nucleic acid binding solid phase, and a second liquid consisting essentially of material selected from the group consisting of;
a) a chaotropic agentb) a chaotropic agent and a chelating agent;
c) a chaotropic agent and divalent positive ions; and
d) a chaotropic agent, a chelating agent and divalent positive ions,wherein the second liquid has a composition such that the resulting mixture of supernatant and second liquid allows for binding of the single stranded nucleic acid to the second solid phase.
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Abstract
The invention relates to methods for easily separating single stranded nucleic acid material from double stranded nucleic acid material in a sample containing both. By the right choice of at lease one chaotropic agent, preferably a guanidine salt, at a selected concentration and other suitable conditions such a chelating agents, pH and the like, it is possible to bind double stranded material to a solid phase such as silica particles, whereas single stranded material will not bind under those circumstances. By separating the silica particles from the sample the double stranded nucleic acid material is removed. It can easily be eluted from the silica particles. In a second step the single stranded material may be bound to a solid phase by selecting a different set of conditions. The particles can again be separated from the sample and the single stranded material may now be eluted. For very efficent separations, the process may be repeated. Following the separation of the two kinds of nucleic acid, either kind may be amplified. Methods of amplification are provided which do not need sequence data of the material to be amplified. In these methods a primer will be provided with an amplification motif and a random hybridization motif.
22 Citations
14 Claims
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1. A method for separating single stranded nucleic acid from double stranded nucleic acid, comprising the steps of:
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contacting a mixture comprising both single stranded nucleic acid and double stranded nucleic acid with a first liquid comprising a chaotropic agent and a nucleic acid binding solid phase, wherein the first liquid has a composition such that the double stranded nucleic acid binds to the solid phase; separating the solid phase from a supernatant containing the single stranded nucleic acid; and contacting the supernatant with a second nucleic acid binding solid phase, and a second liquid consisting essentially of material selected from the group consisting of; a) a chaotropic agent b) a chaotropic agent and a chelating agent; c) a chaotropic agent and divalent positive ions; and d) a chaotropic agent, a chelating agent and divalent positive ions, wherein the second liquid has a composition such that the resulting mixture of supernatant and second liquid allows for binding of the single stranded nucleic acid to the second solid phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification