Method and assembly for DNA isolation with dry reagents
First Claim
1. A method for DNA isolation while removing constituents that interfere with a subsequent PCR, the method comprising:
- integrating materials in a closed analysis single-use unit which allows a sample with DNA to enter;
releasing the DNA by using dry reagents stored in the unit in a form that is stable at room temperature;
isolating the released DNA using DNA-binding substrates, wherein the DNA-binding substrates are magnetic beads;
bringing a dry matrix, lying on a wall in a disintegration channel of the unit and including lysis reagents and the DNA-binding substrates, in contact with biological structures to disintegrate the biological structures containing the DNA, the magnetic beads being distributed in the dry matrix such that the DNAs released by contact with the lysis reagents are bound directly and simultaneously to the DNA-binding substrates; and
collecting the substrates with the bound DNAs and transporting the collected substrates to a site of the PCR.
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Accused Products
Abstract
A DNA isolation method by removal of constituents, interfering with a subsequent PCR is disclosed. According to an embodiment of the method, all substances and method steps are fully integrated into a closed unit (cartridge) for single use, which allows entry of a DNA-containing sample and DNA-binding substrates are used for isolating the released DNA. In particular, when the method is applied to DNA isolation from whole blood by disruption of white blood cells, the reagents, required for carrying out the cell disruption and other reactions, are stored in a form which is stable at room temperature. For disrupting the white blood cells and for DNA isolation, a dry stored lysis reagent is dissolved in an aqueous solution and brought into contact with the white blood cells. The corresponding assembly includes a unit, for housing DNA-containing biological containers and/or reagents, whereby at least one microchannel is provided to contain reagents, whereby the reagent is present in the microchannel as a dry mixture with a negligible vapor pressure, which forms a stable substance at room temperature.
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Citations
14 Claims
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1. A method for DNA isolation while removing constituents that interfere with a subsequent PCR, the method comprising:
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integrating materials in a closed analysis single-use unit which allows a sample with DNA to enter; releasing the DNA by using dry reagents stored in the unit in a form that is stable at room temperature; isolating the released DNA using DNA-binding substrates, wherein the DNA-binding substrates are magnetic beads; bringing a dry matrix, lying on a wall in a disintegration channel of the unit and including lysis reagents and the DNA-binding substrates, in contact with biological structures to disintegrate the biological structures containing the DNA, the magnetic beads being distributed in the dry matrix such that the DNAs released by contact with the lysis reagents are bound directly and simultaneously to the DNA-binding substrates; and collecting the substrates with the bound DNAs and transporting the collected substrates to a site of the PCR. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification