Nucleic acid separation and amplification
First Claim
1. A nucleic acid separation method, comprising:
- exposing a sample comprising cells containing nucleic acid to an aqueous mixture comprising a lytic reagent and one or more beads capable of binding the nucleic acid released from said cells to form a nucleic acid-bead complex; and
passing the nucleic acid-bead complex through an immiscible liquid layer to separate the nucleic acid from the aqueous mixture,wherein the one or more beads are magnetic, and the nucleic acid-bead complex is passed through and separated from the immiscible liquid layer with an applied magnetic field.
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Abstract
The present invention relates to methods for the extraction of nucleic acids from cells, the amplification of segments of nucleic acid and the detection of nucleic acids, all in a convenient and portable manner. In one embodiment, a sample comprising cells containing nucleic acid is exposed to an aqueous mixture comprising a lytic reagent and one or more beads capable of binding the nucleic acid released from said cells to form a nucleic acid-bead complex. The nucleic acid-bead complex is passed through an immiscible liquid layer to separate the nucleic acid from the aqueous mixture. The one or more beads are magnetic, and the nucleic acid-bead complex is passed through and separated from the immiscible liquid layer with an applied magnetic field. The invention is particularly suited for use in point-of-care medical diagnostics testing.
86 Citations
52 Claims
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1. A nucleic acid separation method, comprising:
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exposing a sample comprising cells containing nucleic acid to an aqueous mixture comprising a lytic reagent and one or more beads capable of binding the nucleic acid released from said cells to form a nucleic acid-bead complex; and passing the nucleic acid-bead complex through an immiscible liquid layer to separate the nucleic acid from the aqueous mixture, wherein the one or more beads are magnetic, and the nucleic acid-bead complex is passed through and separated from the immiscible liquid layer with an applied magnetic field. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of transferring nucleic acid, comprising:
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contacting nucleic acid at a first location with one or more beads to form a nucleic acid-bead complex in a liquid; and transporting the nucleic acid-bead complex to a second location separated from the first location by an intermediary layer, wherein said intermediary layer is immiscible with the liquid, wherein the one or more beads are magnetic, and the nucleic acid-bead complex is passed through and separated from the intermediary layer with an applied magnetic field. - View Dependent Claims (8)
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9. A nucleic acid separation method, comprising:
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introducing a sample comprising biological cells through a first layer to a second layer comprising magnetic beads, wherein said first layer is contiguous with said second layer; incubating the sample for sufficient time to permit lysis of the cells and form a nucleic acid-bead complex in said second layer; and applying a magnetic field in proximity to the complex sufficient to move said complex from said second layer through said first layer, thereby separating the complex from the first layer and effectively filtering said complex. - View Dependent Claims (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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31. A method for extracting and amplifying nucleic acid, comprising:
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introducing a sample comprising biological cells through a first layer to a second layer comprising magnetic beads, wherein said first layer is contiguous with said second layer; incubating the sample for sufficient time to permit lysis of the cells and form a nucleic acid-bead complex in said second layer; applying a magnetic field in proximity to the complex sufficient to move said complex from said second layer through and separated from said first layer, thereby removing said complex from said second and first layers; and introducing said complex to a vessel containing a polymerase chain reaction (PCR) cocktail, wherein at least a portion of the nucleic acid elutes off said magnetic beads during a first heating cycle of the PCR. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification