Iterative and regenerative DNA sequencing method
First Claim
1. A method for automated sequencing of double-strande DNA segments with nested single strand overhang templates, such method compromising the steps of:
- i) providing a support array having a plurality of sample holders arrayed in a matrix of positions on the support, and wherein the array is on a stage;
ii) immobilizing a plurality of double-stranded DNA segments at respective sample holders of said array, each DNA segment having an end compromising a single-strand overhang template sequence no longer than about twenty nucleotides in length, wherein said overhang sequence is created by a process including ligation of a strand of a recognition domain to each template and digestion by an enzyme that cuts at a site at least one nucleotide away from the recognition domain, and includes ligation of a DNA sequence that can be used to generate a primer annealing site during DNA amplification in vitro following ligation of the recognition domain and prior to generation of the DNA template;
iii) simultaneously treating all sample holders with one or more reagents which selectively react with at least one nucleotide of said single-strand overhang template to effectively label the material at each holder;
iv) reading said array by automated scan detection to thereby determine at least one nucleotide of said single-strand overhang template; and
v) reducing length of each strand of said DNA segment at each holder by a fixed number n>
1 at said overhang end to produce a homologously ordered array of shorter and nested DNA segments, each with a single-strand overhang template sequence, and further performing steps iii) and iv) to determine at least one nucleotide at each single-strand overhang sequence, wherein the steps of treating, reading and reducing the length of the strands of the DNA segment at each holder by a number of n>
1 nucleotides are iteratively performed as automated process steps to produce nested and progressively shorter DNA segments and to sequence the plurality of DNA segments immobilized at the array of sample holders in situ.
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Abstract
An iterative and regenerative method for sequencing DNA is described. This method sequences DNA in discrete intervals starting at one end of a double stranded DNA segment. This method overcomes problems inherent in other sequencing methods, including the need for gel resolution of DNA fragments and the generation of artifacts caused by single-stranded DNA secondary structures. A particular advantage of this invention is that it can create offset collections of DNA segments and sequence the segments in parallel to provide continuous sequence information over long intervals. This method is also suitable for automation and multiplex automation to sequence large sets of segments.
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Citations
39 Claims
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1. A method for automated sequencing of double-strande DNA segments with nested single strand overhang templates, such method compromising the steps of:
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i) providing a support array having a plurality of sample holders arrayed in a matrix of positions on the support, and wherein the array is on a stage;
ii) immobilizing a plurality of double-stranded DNA segments at respective sample holders of said array, each DNA segment having an end compromising a single-strand overhang template sequence no longer than about twenty nucleotides in length, wherein said overhang sequence is created by a process including ligation of a strand of a recognition domain to each template and digestion by an enzyme that cuts at a site at least one nucleotide away from the recognition domain, and includes ligation of a DNA sequence that can be used to generate a primer annealing site during DNA amplification in vitro following ligation of the recognition domain and prior to generation of the DNA template;
iii) simultaneously treating all sample holders with one or more reagents which selectively react with at least one nucleotide of said single-strand overhang template to effectively label the material at each holder;
iv) reading said array by automated scan detection to thereby determine at least one nucleotide of said single-strand overhang template; and
v) reducing length of each strand of said DNA segment at each holder by a fixed number n>
1 at said overhang end to produce a homologously ordered array of shorter and nested DNA segments, each with a single-strand overhang template sequence, and further performing steps iii) and iv) to determine at least one nucleotide at each single-strand overhang sequence, wherein the steps of treating, reading and reducing the length of the strands of the DNA segment at each holder by a number of n>
1 nucleotides are iteratively performed as automated process steps to produce nested and progressively shorter DNA segments and to sequence the plurality of DNA segments immobilized at the array of sample holders in situ.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for automated sequencing of double-stranded DNA segments, such method compromising the steps of:
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i) providing a support array having a plurality of sample holders arrayed in a matrix of positions on the support, wherein the array is on stage;
ii) immobilizing a plurality of double-stranded DNA segments at respective sample holders of said array, each DNA segment having an end compromising a single-strand overhang template sequence no longer than about twenty nucleotides in length;
iii) simultaneously treating all sample holders with one or more reagents which selectively react with at least one nucleotide of said single-strand overhang template to effectively label the material at each holder;
iv) reading said array by automated scan detection to thereby determine at least one nucleotide of said single-strand overhang template;
v) regenerating material at the respective sample holders by DNA amplification in vitro; and
vi) reducing length of each strand of said DNA segment at each holder by a fixed number n>
1 at said overhang end to produce a homologously ordered array of shorter DNA segments, each with a single-strand overhang template sequence, and further performing step iii) to determine at least one nucleotide at each single-strand overhang sequence, wherein the steps of treating, reading, reducing lengths and product regeneration are iteratively performed as automated process steps to produce progressively shorter DNA segments and to sequence the plurality of DNA segments immobilized at the array of sample holders in situ.- View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification