RAPID AND EFFICIENT CAPTURE OF DNA FROM SAMPLE WITHOUT USING CELL LYSING REAGENT
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Accused Products
Abstract
Nucleic acids can be made available for amplification or other treatment after admixture of a sample with specific weakly basic polymers to form a precipitate with the nucleic acids at acidic pH. After removing non-precipitated materials, the pH is then made basic, thereby releasing the nucleic acids from the polymer. This method for preparing specimen samples is simple and quite rapid, and the released nucleic acids can be further treated in hybridization assays or amplification procedures. No surfactant or other cell lysing reagents are employed. The weakly basic polymers are water-soluble and cationic at acidic pH, but neutral in charge at basic pH.
33 Citations
22 Claims
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1. (canceled)
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2. (canceled)
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3. (canceled)
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4. (canceled)
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5. (canceled)
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6. (canceled)
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7. A method for the amplification and detection of a target nucleic acid without the use of a cell lysing reagent, comprising:
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I) providing a sample suspected of containing a target nucleic acid, II) subjecting said sample containing the target nucleic acid to the steps of;
A) at a pH of less than 7, contacting said target nucleic acid with a water-soluble, weakly basic polymer comprised of recurring units derived by addition polymerization of;
1) from about 15 to 100 weight percent of a water-soluble, weakly basic ethylenically unsaturated polymerizable monomer having at least one group which can be protonated at acidic pH and which is selected from the group consisting of aminoalkyl, imidazolyl, isoxazolyl, pyridyl, piperidyl, piperazinyl, pyrazolyl, triazolyl, tetrazolyl, oxadiazolyl, pyridazinyl, pyrimidyl, pyrazinyl, quinolinyl and quinazolinyl, 2) from 0 to about 35 weight percent of a nonionic, hydrophilic ethylenically unsaturated polymerizable monomer, and 3) from 0 to about 85 weight percent of a nonionic, hydrophobic ethylenically unsaturated polymerizable monomer in an amount sufficient to form a water-insoluble precipitate of said weakly basic polymer with all nucleic acids present in said sample, including said target nucleic acid, B) separating said water-insoluble precipitate from said sample, and C) contacting said precipitate with a base to raise the solution pH to greater than 7, and thereby releasing said nucleic acids, including said target nucleic acid, from said weakly basic polymer, said weakly basic polymer comprising recurring units derived by addition polymerization of one or more ethylenically unsaturated polymerizable monomers having an amine group which can be protonated at acidic pH, III) without further adjustment of pH, amplifying said released target nucleic acid, and IV) detecting said amplified target nucleic acid. - View Dependent Claims (8, 9)
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10. A kit for detection of K-ras mutation in a biological sample, said kit comprising a diagnostic K-ras primer selected from the group consisting of:
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(a) TGAATATAAA CTTGTGGTAC CTGGACC T (5K15S) <
SEQ ID;
NO 1>
,(b) ATATAAACTT GTGGTACTTC CAGCTGGT (5K37) <
SEQ ID;
NO 2>
,(c) GAATTAGCTG TATCGTCAAG GCACTC (3K42) <
SEQ ID;
NO 3>
,(d) TCAGCAAAGA CAAGACAGGT A (5BK5) <
SEQ ID;
NO 4>
,(e) TATAGATGGT GAAACCTGTT TGTTGG (5N12A) <
SEQ ID;
NO 5>
,(f) CTTGCTATTA TTGATGGCAA CCACACAGA (3N13A) <
SEQ ID;
NO 6>(g) any combination of the foregoing.
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11. The oligonucleotide TGAATATAAA CTTGTGGTAC CTGGAGC T <
- SEQ ID;
NO 1>
.
- SEQ ID;
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12. The oligonucleotide ATATAAACTT GTGGTAGTTC CAGCTGGT <
- SEQ ID;
NO 2>
.
- SEQ ID;
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13. The oligonucleotide GAATTAGCTG TATCGTCAAG GCACTC <
- SEQ ID;
NO 3>
.
- SEQ ID;
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14. The oligonucleotide TCAGCAAAGA CAAGACAGGT A <
- SEQ ID;
NO 4>
.
- SEQ ID;
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15. The oligonucleotide TATAGATGGT GAAACCTGTT TGTTGG <
- SEQ ID;
NO 5>
.
- SEQ ID;
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16. The oligonucleotide CTTGCTATTA TTGATGGCAA CCACACAGA <
- SEQ ID;
NO 6>
.
- SEQ ID;
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17. A K-ras diagnostic primer comprising the oligonucleotide TGAATATAAA CTTGTGGTAC CTGGAGC T <
- SEQ ID;
NO 1>
.
- SEQ ID;
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18. A K-ras diagnostic primer comprising the oligonucleotide ATATAAACTT GTGGTAGTTC CAGCTGGT <
- SEQ ID;
NO 2>
,
- SEQ ID;
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19. A K-ras diagnostic primer comprising the oligonucleotide GAATTAGCTG TATCGTCAAG GCACTC <
- SEQ ID;
NO 3>
.
- SEQ ID;
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20. A K-ras diagnostic primer comprising the oligonucleotide TCAGCAAAGA CAAGACAGGT A <
- SEQ ID;
NO 4>
.
- SEQ ID;
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21. A K-ras diagnostic primer comprising the oligonucleotide TATAGATGGT GAAACCTGTT TGTTGG <
- SEQ ID;
NO 5>
.
- SEQ ID;
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22. A K-ras diagnostic primer comprising the oligonucleotide CTTGCTATTA TTGATGGCAA CCACACAGA <
- SEQ ID;
NO 6>
.
- SEQ ID;
Specification