POLYNUCLEOTIDE CAPTURE MATERIALS, AND METHODS OF USING SAME
First Claim
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1. A method for isolating polynucleotides from a cell-containing sample in a process tube, the method comprising:
- contacting the sample in the process tube with a lysis solution having a pH between 4 and 8, thereby releasing polynucleotides from the cells in the cell-containing sample;
contacting the sample in the process tube with a plurality of magnetic binding particles coated in PAMAM, wherein the polynucleotides becomes reversibly bound to the PAMAM, thereby creating binding particles bound with polynucleotides and a solution containing residual cellular material in the process tube;
compacting the binding particles bound with the polynucleotides in the process tube by positioning a magnet in communication with the binding particles;
removing the solution containing residual cellular material from the process tube;
washing the binding particles with a solution having a pH≦
9, thereby retaining the polynucleotides bound to the binding particles; and
contacting the binding particles bound with polynucleotides with a solution having a pH≧
9 to release the polynucleotides from the PAMAM on the binding particles, thereby isolating the polynucleotides from the cell-containing sample.
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Abstract
Methods for processing polynucleotide-containing biological samples, and materials for capturing polynucleotide molecules such as RNA and/or DNA from such samples. The RNA and/or DNA is captured by polyamindoamine (PAMAM (Generation 0)) bound to a surface, such as the surface of magnetic particles. The methods and materials have high efficiency of binding RNA and of DNA, and of release, and thereby permit quantitative determinations.
65 Citations
12 Claims
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1. A method for isolating polynucleotides from a cell-containing sample in a process tube, the method comprising:
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contacting the sample in the process tube with a lysis solution having a pH between 4 and 8, thereby releasing polynucleotides from the cells in the cell-containing sample; contacting the sample in the process tube with a plurality of magnetic binding particles coated in PAMAM, wherein the polynucleotides becomes reversibly bound to the PAMAM, thereby creating binding particles bound with polynucleotides and a solution containing residual cellular material in the process tube; compacting the binding particles bound with the polynucleotides in the process tube by positioning a magnet in communication with the binding particles; removing the solution containing residual cellular material from the process tube; washing the binding particles with a solution having a pH≦
9, thereby retaining the polynucleotides bound to the binding particles; andcontacting the binding particles bound with polynucleotides with a solution having a pH≧
9 to release the polynucleotides from the PAMAM on the binding particles, thereby isolating the polynucleotides from the cell-containing sample. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for separately isolating DNA and RNA from a cell-containing sample, the method comprising:
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contacting the sample with a lysis solution having a pH between 4 and 8, thereby releasing DNA and RNA from the cells in the cell-containing sample; contacting the sample with a plurality of binding particles, wherein the binding particles retain the DNA and RNA in the cell-containing sample; compacting the plurality of binding particles having the DNA and RNA bound thereto; releasing the RNA from the binding particles by contacting the compacted binding particles with a first release solution; removing the solution containing the released RNA, thereby isolating the RNA; and releasing the DNA from the binding particles by contacting the compacted binding particles with a second release solution, thereby isolating the DNA, wherein the pH of the second release solution is greater than the pH of the first release solution. - View Dependent Claims (9, 10, 11, 12)
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Specification