Process for controlling contamination of nucleic acid amplification reactions
First Claim
1. A method for controlling contamination in sequential nucleic acid amplification processes comprising first and second nucleic acid amplification processes to amplify nucleic acid sequences in a first and a second sample, respectively, which comprises:
- carrying out said first nucleic acid amplification process on said nucleic acid sequence in said first sample in the presence of deoxyuridine triphosphate, to thereby generate a deoxyuracil-containing product of amplification; and
treating said deoxyuracil-containing product of amplification with uracil DNA glycosylase prior to carrying out said second amplification process on said nucleic acid sequence in said second sample.
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Abstract
In the process according to this invention, an amplification procedure is performed on a first sample in which one or more of the four normal ribonucleoside triphosphates (rNTPs) or deoxyribonucleoside triphosphates (dNTPs) is replaced with an exo-sample nucleotide. After amplification, any contaminating amplified product that may be remaining is subjected to a physical, chemical, enzymatic, or biological treatment which renders nucleic acid containing the exo-sample nucleotide substantially unamplifiable. The treatment may be done as a separate step or it may be done in the presence of a second sample containing nucleic acid sequences to be amplified. The amplified nucleic acid sequences derived from the first sample which contaminate the second sample are not further substantially amplified during amplification of nucleic acid sequences of the second sample.
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Citations
4 Claims
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1. A method for controlling contamination in sequential nucleic acid amplification processes comprising first and second nucleic acid amplification processes to amplify nucleic acid sequences in a first and a second sample, respectively, which comprises:
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carrying out said first nucleic acid amplification process on said nucleic acid sequence in said first sample in the presence of deoxyuridine triphosphate, to thereby generate a deoxyuracil-containing product of amplification; and treating said deoxyuracil-containing product of amplification with uracil DNA glycosylase prior to carrying out said second amplification process on said nucleic acid sequence in said second sample. - View Dependent Claims (2, 3, 4)
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Specification