Abstract: A method for analyzing a target nucleotide sequence which exists in a first state or a different second state which makes the method particularly useful for determining point mutations. The method uses a first polynucleotide which is immobilized on a solid support and which is at least partially complementary to a first segment of the target nucleotide sequence. By means of a series of steps, a product of the first polynucleotide and a further polynucleotide that contains a detectable label can be obtained. When the state to be analyzed occurs in a rare population, amplification can be conducted so that substantially only amplification of the target nucleotide sequence in one of the states is attained. The method can be used to analyze multiple target sequences simultaneously. A kit which can be used in the method is also set forth.

Abstract: A process for amplifying nucleic acid sequences from a DNA or RNA template which may be purified, or may exist in a mixture of nucleic acids. The resulting nucleic acid sequences may be exact copies of the template, or may be modified. The process has advantages over prior art amplification processes in that it increases the fidelity of copying a specific nucleic acid sequence, and it allows one to more efficiently detect a particular point mutation in a single assay.

Abstract: The present invention relates to a method, reagent and kit for the determination of the presence of target nucleotide sequences by restriction amplification. In the process to detect nucleic acid sequences a target molecule containing a specific restriction site is hybridized with a labeled probe containing a sequence homologous to at least 28 bases of the target molecule. The probe is cleaved with a restriction enzyme that releases the probe for detection if the probe hybridizes to the specific target. Thus, the cleaved probe constantly regenerates and is highly detectable if the target sequence is present in the assay.

Abstract: The present invention relates to a method, reagent and kit for the determination of the presence of target nucleotide sequences by restriction amplification. In the process to detect nucleic acid sequences a target molecule containing a specific restriction site is hybridized with a labeled probe containing a sequence homologous to at least 28 bases of the target molecule. The probe is cleaved with a restriction enzyme that releases the probe for detection if the probe hybridizes to the specific target. A second oligonucleotide is present in the reaction that is homologous to the 3 prime end of the probe molecule and also conains 5 prime base or bases that will reconstitute the restriction enzyme site on the target. Thus, the cleaved probe constantly regenerates and is highly detectable if the target sequence is present in the assay.