Abstract: The invention relates to methods for targeting an exogenous polynucleotide or exogenous complementary polynucleotide pair to a predetermined endogenous DNA target sequence in a eukaryotic cell by homologous pairing, particularly for altering an endogenous DNA sequence, such as a chromosomal DNA sequence, typically by targeted homologous recombination. In certain embodiments, the invention relates to methods for targeting an exogenous polynucleotide having a linked chemical substituent to a predetermined endogenous DNA sequence in a metabolically active eukaryotic cell, generating a DNA sequence-specific targeting of one or more chemical substituents in an intact nucleus of a metabolically active eukaryotic cell, generally for purposes of altering a predetermined endogenous DNA sequence in the cell.

Abstract: The invention relates to methods for targeting an exogenous polynucleotide or exogenous complementary polynucleotide pair to a predetermined endogenous DNA target sequence in a target cell by homologous pairing, particularly for altering an endogenous DNA sequence, such as a chromosomal DNA sequence, typically by targeted homologous recombination. In certain embodiments, the invention relates to methods for targeting an exogenous polynucleotide having a linked chemical substituent to a predetermined endogenous DNA sequence in a metabolically active target cell, generating a DNA sequence-specific targeting of one or more chemical substituents in an intact nucleus of a metabolically active target cell, generally for purposes of altering a predetermined endogenous DNA sequence in the cell.

Abstract: The invention relates to methods for targeting an exogenous polynucleotide or exogenous complementary polynucleotide pair to a predetermined endogenous DNA target sequence in a eukaryotic cell by homologous pairing, particularly for altering an endogenous DNA sequence, such as a chromosomal DNA sequence, typically by targeted homologous recombination. In certain embodiments, the invention relates to methods for targeting an exogenous polynucleotide having a linked chemical substituent to a predetermined endogenous DNA sequence in a metabolically active eukaryotic cell, generating a DNA sequence-specific targeting of one or more chemical substituents in an intact nucleus of a metabolically active eukaryotic cell, generally for purposes of altering a predetermined endogenous DNA sequence in the cell.

Abstract: The invention relates to methods for targeting an exogenous polynucleotide or exogenous complementary polynucleotide pair to a predetermined endogenous DNA target sequence in a eukaryotic cell by homologous pairing, particularly for altering an endogenous DNA sequence, such as a chromosomal DNA sequence, typically by targeted homologous recombination. In certain embodiments, the invention relates to methods for targeting an exogenous polynucleotide having a linked chemical substituent to a predetermined endogenous DNA sequence in a metabolically active eukaryotic cell, generating a DNA sequence-specific targeting of one or more chemical substituents in an intact nucleus of a metabolically active eukaryotic cell, generally for purposes of altering a predetermined endogenous DNA sequence in the cell.

Abstract: A method of identifying the presence of a known target sequence in nucleic acid contained in a fixed cellular or subcellular biological structure. By adding a stable, reporter-labeled RecA/single-stranded probe complex to the cellular or subcellular structure, the target sequence can be effectively labeled by in situ hybridization, allowing the target sequence to be visualized histologically and microscopically or detected by in situ cytometry or cell sorting flow techniques.

Abstract: The present invention describes the formation of RecA protein catalyzed double-stranded probe:duplex linear target DNA complexes that are stable to deproteinization. The uses of this stable probe:target complex in diagnostic/DNA detection systems in in vitro and in situ DNA hybridization reactions is discussed. The probe:target complexes are also useful for diagnostic application in RecA protein facilitated DNA amplification reactions.

Abstract: A method of identifying the presence of a known target sequence in double-stranded DNA contained in a fixed cellular or subcellular biological structure. By adding a stable, reporter-labeled RecA/single-stranded probe complex to the structure, the target sequence can be effectively labeled by in situ hybridization, allowing the target sequence to be visualized histologically and microscopically or detected by in situ cytometry or cell sorting flow techniques.

Abstract: The present invention describes the formation of RecA protein catalyzed double-stranded probe:duplex linear target DNA complexes that are stable to deproteinization. The uses of this stable probe:target complex in diagnostic/DNA detection systems in in vitro and in situ DNA hybridization reactions is discussed. The probe:target complexes are also useful for diagnostic application in RecA protein facilitated DNA amplification reactions.

Abstract: The present invention is directed to a method of achieving RecA protein facilitated amplification of a double-stranded DNA target sequence having first and second complementary strands, each strand with 5' and 3' ends. The method involves complexing a primer complementary to a 5' end region of the first strand and a primer complementary to a 5' end region of the second strand with RecA protein in the presence of ATP-.gamma.-S. The complexed primers are then reacted in a mixture also containing the target sequence, all four dNTPs, RecA protein and DNA polymerase. The reaction is conducted below the temperature required for thermal dissociation of the two target strands and continued until a desired degree of amplification of the target sequence is achieved.The present invention further includes the cloning and identification of the coding sequences for the RecA protein of Thermus aquaticus.