Methods for bead-based sequencing
First Claim
1. A method for determining information about a template sequence, the method comprising the steps of:
- (I) performing a sequencing reaction on a probe-template complex having a duplex portion, wherein the sequencing reaction comprises;
(a) contacting the complex with a collection of oligonucleotide probes, the collection comprising at least two probe families, wherein;
(i) a probe family is a group of one or more different probes that are identically labeled, and(ii) the probe families are labeled distinguishably from each other;
(b) extending the duplex portion by ligating an extendable terminus of the duplex portion with a labeled probe from the collection that has hybridized to the template;
(c) detecting the label of the ligated probe to identify its probe family , wherein the identity of the probe family eliminates one or more possibilities for the identity of at least one template sequence nucleotide but leaves at least two such possibilities open for that nucleotide; and
(d) repeating steps (a) to (c) for a desired number of cycles to obtain an ordered series of probe family names of successively ligated probes,(II) optionally performing at least one more sequencing reaction; and
(III) generating an ordered list of probe family names from at least one ordered series of probe family names from a sequencing reaction, wherein the ordered list provides information about the template sequence.
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Abstract
The present invention provides methods for determining a nucleic acid sequence by performing successive cycles of duplex extension along a single stranded template. The cycles comprise steps of extension, ligation, and, preferably, cleavage. In certain embodiments the methods make use of extension probes containing phosphorothiolate linkages and employ agents appropriate to cleave such linkages. The invention provides methods of determining information about a sequence using at least two distinguishably labeled probe families. In certain embodiments the methods acquire less than 2 bits of information from each of a plurality of nucleotides in the template in each cycle. In certain embodiments the sequencing reactions are performed on templates attached to beads. The invention further provides sets of labeled extension probes containing phosphorothiolate linkages. In addition, the invention includes performing multiple sequencing reactions on a single template by removing initializing oligonucleotides and extended strands and performing subsequent reactions using different initializing oligonucleotides.
99 Citations
20 Claims
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1. A method for determining information about a template sequence, the method comprising the steps of:
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(I) performing a sequencing reaction on a probe-template complex having a duplex portion, wherein the sequencing reaction comprises; (a) contacting the complex with a collection of oligonucleotide probes, the collection comprising at least two probe families, wherein; (i) a probe family is a group of one or more different probes that are identically labeled, and (ii) the probe families are labeled distinguishably from each other; (b) extending the duplex portion by ligating an extendable terminus of the duplex portion with a labeled probe from the collection that has hybridized to the template; (c) detecting the label of the ligated probe to identify its probe family , wherein the identity of the probe family eliminates one or more possibilities for the identity of at least one template sequence nucleotide but leaves at least two such possibilities open for that nucleotide; and (d) repeating steps (a) to (c) for a desired number of cycles to obtain an ordered series of probe family names of successively ligated probes, (II) optionally performing at least one more sequencing reaction; and (III) generating an ordered list of probe family names from at least one ordered series of probe family names from a sequencing reaction, wherein the ordered list provides information about the template sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification