Method for reducing carryover contamination in an amplification procedure
First Claim
1. A method for reducing DNA carryover contamination in a first test sample which may contain amplification product from a previously amplified DNA target-containing test sample comprising:
- (a) amplifying said DNA target of said previous test sample in the presence of at least one modified amplification probe or primer to generate a modified amplification product having an enzyme recognition site or chemically cleavable site not present in said target; and
,(b) contacting said first test sample with a means for cleaving said modified amplification product to reduce the amount of modified amplification product from said previous test sample thereby reducing DNA carryover contamination present in said first test sample.
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Abstract
The present invention provides an efficient and economical method for reducing carryover contamination in an amplification procedure. The method of the present invention enables background caused by contaminant amplification product to be reduced or eliminated through the incorporation of at least one modification into the amplification product. The modified amplification product is readily distinguishable from the target sequence in a test sample. Prior to amplifying the target in a new test sample, the sample may be treated to selectively cleave the contaminant amplification product so that it cannot be amplified in the new sample.
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Citations
21 Claims
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1. A method for reducing DNA carryover contamination in a first test sample which may contain amplification product from a previously amplified DNA target-containing test sample comprising:
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(a) amplifying said DNA target of said previous test sample in the presence of at least one modified amplification probe or primer to generate a modified amplification product having an enzyme recognition site or chemically cleavable site not present in said target; and
,(b) contacting said first test sample with a means for cleaving said modified amplification product to reduce the amount of modified amplification product from said previous test sample thereby reducing DNA carryover contamination present in said first test sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A kit for reducing DNA carryover contamination in a polymerase chain reaction type of amplification procedure comprising:
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(a) at least one modified amplification primer which is capable of incorporating at least one modification into a PCR-derived amplification product such that the resulting modified PCR-derived amplification product has a remote cutting restriction enzyme recognition site not present in said target sequence; and
,(b) a remote cutting restriction enzyme. - View Dependent Claims (13)
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14. A kit for reducing DNA carryover contamination in a ligase chain reaction type of amplification procedure comprising:
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(a) at least one upper strand and at least one lower strand modified amplification probe which are capable of incorporating at least one upper strand and at least one lower strand modification into a remote cutting restriction LCR-derived amplification product such that the resulting modified LCR-derived amplification product has an enzyme recognition site not present in said target sequence; and
,(b) a remote cutting restriction enzyme. - View Dependent Claims (15)
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16. A method for reducing DNA carryover contamination in a method for amplifying a target sequence comprising the steps of:
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(a) hybridizing at least two amplification primers to said target sequence in the presence of an excess of deoxynuclcoside triphosphates and a polymerizing agent, wherein at least one of said amplification primers is a modified amplification primer having a modification selected from the group consisting of an enzyme recognition site and a chemically cleavable site; (b) extending said amplification primers with said deoxynucleoside triphosphates and said polymerizing agent to generate amplification product such that modified amplification product is generated from extension of each modified amplification primer; (c) separating said modified amplification product from said target sequence; (d) repeating steps (a) through (c); and (e) cleaving said modified amplification product thereby reducing DNA carryover contamination in a method for amplifying a target sequence. - View Dependent Claims (17, 18)
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19. A method for reducing DNA carryover contamination in a method for amplifying a denatured double-stranded target sequence comprising the steps of:
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(a) contiguously hybridizing at least two pairs of amplification probes to said denatured double stranded target sequence, wherein at least one upper strand and at least one lower strand of said pairs of amplification probes is a modified amplification probe having a modification selected from the group consisting of an enzyme recognition site and a chemically clearable site; (b) ligating said contiguously hybridized amplification probes to generate modified amplification product thereby reducing DNA carryover contamination in a method for amplifying a denatured double stranded target sequence; (c) separating said modified amplification product from said target sequence; (d) repeating steps (a) through (c); (e) cleaving said modified amplification product. - View Dependent Claims (20, 21)
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Specification