Method of detecting gene mutation
First Claim
1. A method of detecting a first sequence or a second sequence in a target region of DNA, comprising:
- (A) providing a double stranded DNA comprising a target region, the target region comprising either a first sequence or a second sequence differing at a mutation site;
(B) amplifying the double stranded DNA in a first reaction mixture by a DNA polymerase reaction comprising(i) a first DNA polymerase,(ii) a first primer complementary to a second strand of the double stranded DNA and labeled with a first labeling agent,(iii) a second primer complementary to a first strand of the double stranded DNA,(iv) a first hybridization probe labeled with a second labeling agent and designed not to inhibit the DNA amplification, the first hybridization probe comprisinga length of 10-15 mer,the first sequence mutation site, andfull complementarity to the first strand of the double stranded DNA comprising the first sequence and(v) a second hybridization probe not labeled with the second labeling agent and designed not to inhibit the DNA amplification, the second hybridization probe comprisinga length of 10-15 mer;
the second sequence mutation site, andfull complementarity to the first strand of the double stranded DNA comprising the second sequence,thereby obtaining a first amplified DNA comprising the first labeling agent; and
(C) hybridizing at 25°
C. the first amplified DNA in the first reaction mixture to the first hybridization probe or the second hybridization probe, wherein hybridizing occurs in the first reaction mixture and no addition of a reagent occurs between amplifying and hybridizing;
(D) applying the first reaction mixture after hybridization onto a first chromatography support; and
(E) amplifying the double stranded DNA in a second reaction mixture by a DNA polymerase reaction comprising(i) a second DNA polymerase,(ii) the first primer labeled with the first labeling agent,(iii) the second primer,(iv) the first hybridization probe not labeled with the second labeling agent, and(v) the second hybridization probe labeled with the second labeling agent,thereby, obtaining a second amplified DNA comprising the first labeling agent; and
(F) hybridizing at 25°
C. the second amplified DNA in the second reaction mixture to the first hybridization probe or the second hybridization probe, wherein hybridizing occurs in the second reaction mixture and no addition of a reagent occurs between amplifying and hybridizing;
(G) applying the second reaction mixture after hybridization onto a second chromatography support; and
(H) determining that the DNA comprises the first sequence by detecting a first hybrid via affinity chromatography on the first chromatography support, the first hybrid being fully complementary between (i) the first hybridization probe labeled with the second labeling agent and (ii) DNA comprising the first sequence labeled with the first labeling agent;
or(I) determining that the DNA comprises the second sequence by detecting a second hybrid via affinity chromatography on the second chromatography support, the second hybrid being fully complementary between (i) the second hybridization probe labeled with the second labeling agent and (ii) DNA comprising the second sequence labeled with the first labeling agent,wherein, a ligase enzyme is not required after hybridization.
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Accused Products
Abstract
DNA amplification and hybridization are successively carried out in a reaction system containing primers for the DNA amplification and hybridization probes, followed by detecting the hybrid in the reaction solution by affinity chromatography, wherein at least one of the primers to be used in the DNA amplification is labeled with a first labeling agent so that the amplified DNA will be labeled with the first labeling agent, a hybridization probe is labeled with a second labeling agent and contained in a reaction solution for effecting the DNA amplification, the base sequence of the hybridization probe is designed not to inhibit the DNA amplification, and a hybrid is detected by affinity chromatography with the use of the first and second labeling agents.
15 Citations
13 Claims
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1. A method of detecting a first sequence or a second sequence in a target region of DNA, comprising:
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(A) providing a double stranded DNA comprising a target region, the target region comprising either a first sequence or a second sequence differing at a mutation site; (B) amplifying the double stranded DNA in a first reaction mixture by a DNA polymerase reaction comprising (i) a first DNA polymerase, (ii) a first primer complementary to a second strand of the double stranded DNA and labeled with a first labeling agent, (iii) a second primer complementary to a first strand of the double stranded DNA, (iv) a first hybridization probe labeled with a second labeling agent and designed not to inhibit the DNA amplification, the first hybridization probe comprising a length of 10-15 mer, the first sequence mutation site, and full complementarity to the first strand of the double stranded DNA comprising the first sequence and (v) a second hybridization probe not labeled with the second labeling agent and designed not to inhibit the DNA amplification, the second hybridization probe comprising a length of 10-15 mer; the second sequence mutation site, and full complementarity to the first strand of the double stranded DNA comprising the second sequence, thereby obtaining a first amplified DNA comprising the first labeling agent; and (C) hybridizing at 25°
C. the first amplified DNA in the first reaction mixture to the first hybridization probe or the second hybridization probe, wherein hybridizing occurs in the first reaction mixture and no addition of a reagent occurs between amplifying and hybridizing;(D) applying the first reaction mixture after hybridization onto a first chromatography support; and (E) amplifying the double stranded DNA in a second reaction mixture by a DNA polymerase reaction comprising (i) a second DNA polymerase, (ii) the first primer labeled with the first labeling agent, (iii) the second primer, (iv) the first hybridization probe not labeled with the second labeling agent, and (v) the second hybridization probe labeled with the second labeling agent, thereby, obtaining a second amplified DNA comprising the first labeling agent; and (F) hybridizing at 25°
C. the second amplified DNA in the second reaction mixture to the first hybridization probe or the second hybridization probe, wherein hybridizing occurs in the second reaction mixture and no addition of a reagent occurs between amplifying and hybridizing;(G) applying the second reaction mixture after hybridization onto a second chromatography support; and (H) determining that the DNA comprises the first sequence by detecting a first hybrid via affinity chromatography on the first chromatography support, the first hybrid being fully complementary between (i) the first hybridization probe labeled with the second labeling agent and (ii) DNA comprising the first sequence labeled with the first labeling agent;
or(I) determining that the DNA comprises the second sequence by detecting a second hybrid via affinity chromatography on the second chromatography support, the second hybrid being fully complementary between (i) the second hybridization probe labeled with the second labeling agent and (ii) DNA comprising the second sequence labeled with the first labeling agent, wherein, a ligase enzyme is not required after hybridization. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification