Digital counting of individual molecules by stochastic attachment of diverse labels
DCFirst Claim
1. A method of analyzing a sample comprising a plurality of nucleic acids, the method comprising:
- a. attaching a plurality of primers to the plurality of nucleic acids from the sample, wherein each primer of the plurality of primers comprises a different variable label region, and the plurality of nucleic acids comprises multiple occurrences of a target nucleic acid;
b. extending the plurality of primers attached to the plurality of nucleic acids to produce a plurality of labeled nucleic acids, wherein each one of the plurality of labeled nucleic acids comprises (i) a variable label region; and
(ii) a complementary copy of a nucleic acid that was attached to a primer; and
c. attaching a plurality of second primers to the plurality of labeled nucleic acids and extending the plurality of second primers to produce a plurality of double-stranded labeled nucleic acids.
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Abstract
Compositions, methods and kits are disclosed for high-sensitivity single molecule digital counting by the stochastic labeling of a collection of identical molecules by attachment of a diverse set of labels. Each copy of a molecule randomly chooses from a non-depleting reservoir of diverse labels. Detection may be by a variety of methods including hybridization based or sequencing. Molecules that would otherwise be identical in information content can be labeled to create a separately detectable product that is unique or approximately unique in a collection. This stochastic transformation relaxes the problem of counting molecules from one of locating and identifying identical molecules to a series of binary digital questions detecting whether preprogrammed labels are present. The methods may be used, for example, to estimate the number of separate molecules of a given type or types within a sample.
291 Citations
41 Claims
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1. A method of analyzing a sample comprising a plurality of nucleic acids, the method comprising:
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a. attaching a plurality of primers to the plurality of nucleic acids from the sample, wherein each primer of the plurality of primers comprises a different variable label region, and the plurality of nucleic acids comprises multiple occurrences of a target nucleic acid; b. extending the plurality of primers attached to the plurality of nucleic acids to produce a plurality of labeled nucleic acids, wherein each one of the plurality of labeled nucleic acids comprises (i) a variable label region; and
(ii) a complementary copy of a nucleic acid that was attached to a primer; andc. attaching a plurality of second primers to the plurality of labeled nucleic acids and extending the plurality of second primers to produce a plurality of double-stranded labeled nucleic acids. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification