Method for rapid base sequencing in DNA and RNA
First Claim
1. A method for DNA and RNA base sequencing, comprising the steps of:
- isolating a single fragment of DNA or RNA;
introducing said single fragment into a moving sample stream;
sequentially cleaving the end base from the DNA or RNA fragment with exonuclease to form a train of said bases; and
detecting said bases in said train in sequential passage through a detector which detects single molecules.
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Accused Products
Abstract
A method is provided for the rapid base sequencing of DNA or RNA fragments wherein a single fragment of DNA or RNA is provided with identifiable bases and suspended in a moving flow stream. An exonuclease sequentially cleaves individual bases from the end of the suspended fragment. The moving flow stream maintains the cleaved bases in an orderly train for subsequent detection and identification. In a particular embodiment, individual bases forming the DNA or RNA fragments are individually tagged with a characteristic fluorescent dye. The train of bases is then excited to fluorescence with an output spectrum characteristic of the individual bases. Accordingly, the base sequence of the original DNA or RNA fragment can be reconstructed.
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Citations
21 Claims
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1. A method for DNA and RNA base sequencing, comprising the steps of:
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isolating a single fragment of DNA or RNA; introducing said single fragment into a moving sample stream; sequentially cleaving the end base from the DNA or RNA fragment with exonuclease to form a train of said bases; and detecting said bases in said train in sequential passage through a detector which detects single molecules. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for base sequencing of DNA or RNA fragments, comprising the steps of:
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forming said fragments with bases having identifiable characteristics; sequentially cleaving single identifiable bases from a single one of said fragments to form a train of said identifiable bases; and identifying said single, cleaved bases in said train. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method for DNA or RNA base sequencing, comprising the steps of;
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modifying each nucleotide effective for DNA or RNA synthesis to attach a fluorescent dye characteristic of that nucleotide with a linker arm effective to enable DNA or RNA synthesis and exonuclease cleavage; synthesizing from said modified nucleotides a strand of DNA complementary to a DNA or RNA strand having a base sequence to be determined; cleaving each said modified nucleotide sequentially from a single fragment containing said complementary DNA strand; and fluorescing each said characteristic dye to identify said sequence of nucleotides. - View Dependent Claims (19, 20, 21)
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Specification