Method of detecting and characterizing a nucleic acid or reactant for the application of this method
First Claim
1. A detection method for detecting the presence or absence of a nucleic acid in a biological medium, the medium containing also other nucleic acids which are not sought to be detected, by means of a probe containing a nucleic acid complementary of said nucleic acid sought to be detected and by means of measurement on a substrate specific to an enzyme, which method comprises:
- hybridizing the nucleic acid sought to be detected with said probe having a complementary nucleic acid, thereby forming a hybridized product,separating excess non-hybridized probe from said hybridized product and the other nucleic acids,coupling the hybridized product with an enzyme, thereby forming an enzyme-bonded product,wherein either said probe is modified by a chemical group for coupling with the enzyme of said enzyme is modified by a chemical group for coupling with said probe,measuring the activity of the enzyme-bonded product on the subtrate specific to the enzyme in the presence of the other nucleic acids, thereby detecting whether or not the nucleic acid is present.
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Abstract
Method for detecting the possible presence of a DNA fragment, notably of a gene, in the midst of a complex sample of nucleic acids.
It comprises the hybridization of the sought fragment with a RNA probe, this being, prior or subsequent to the hybridization reaction, modified by an enzyme.
Application to seeking of particular genes or DNA fragments in the midst of a biological sample.
225 Citations
32 Claims
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1. A detection method for detecting the presence or absence of a nucleic acid in a biological medium, the medium containing also other nucleic acids which are not sought to be detected, by means of a probe containing a nucleic acid complementary of said nucleic acid sought to be detected and by means of measurement on a substrate specific to an enzyme, which method comprises:
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hybridizing the nucleic acid sought to be detected with said probe having a complementary nucleic acid, thereby forming a hybridized product, separating excess non-hybridized probe from said hybridized product and the other nucleic acids, coupling the hybridized product with an enzyme, thereby forming an enzyme-bonded product, wherein either said probe is modified by a chemical group for coupling with the enzyme of said enzyme is modified by a chemical group for coupling with said probe, measuring the activity of the enzyme-bonded product on the subtrate specific to the enzyme in the presence of the other nucleic acids, thereby detecting whether or not the nucleic acid is present. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A detection method for detecting the presence or absence of a nucleic acid in a biological medium, the medium containing also other nucleic acids which are not sought to be detected, by means of measurement on a substrate specific to a chemically-modified enzyme, which comprises:
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hybridizing the nucleic acid sought to be detected with a probe having a complementary nucleic acid, thereby forming a hybridized product, separating excess non-hybridized probe from said hybridized product and the other nucleic acids, coupling the hybridized product with an enzyme which is chemically-modified to bind to the probe of the hybridized product, thereby forming a chemically modified enzyme-coupled product, measuring the activity of the chemically-modified enzyme-coupled product on the substrate specific to the enzyme in the presence of the other nucleic acids, thereby detecting whether or not the nucleic acid is present. - View Dependent Claims (17)
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18. A composition of matter for detecting the presence or absence of a nucleic acid in a biological sample containing said nucleic acid and other nucleic acids, the presence or absence of which is not sought to be detected, said composition of matter comprising an enzyme, a probe modified by a chemical group for coupling with said enzyme and comprising a complementary nucleic acid sequence which is hybridizable with the nucleic acid sought to be detected to thereby form a hybridized product-enzyme complex, and
a substrate specific to the enzyme, for the detection of said hybridized product-enzyme complex.
- 22. A composition of matter which comprises a biological sample containing a nucleic acid sought to be detected and other nucleic acids, a probe which comprises a nucleic acid sequence complementary to the nucleic acid sought to be detected and hybridized therewith, which composition is substantially free of unhybridized probe and in which composition the hybridized probe is modified by a chemical group and said probe is bonded to an enzyme through said chemical group and which composition of matter is capable of acting on a substrate specific to the enzyme.
- 25. An article of manufacture for detecting the presence or absence of a nucleic acid in a biological sample containing other nucleic acids the presence or absence of which is not sought to be detected, which article comprises a probe which comprises a complementary nucleic acid sequence which is hybridizable with the nucleic acid sought to be detected, an enzyme and a substrate specific for the enzyme, and wherein either said probe is modified by a chemical group for coupling with the enzyme or said enzyme is modified by a chemical group for coupling with said probe.
Specification