Rapid, quantitative method for the mass spectrometric analysis of nucleic acids for gene expression and genotyping
First Claim
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1. A method of detecting a specific nucleic acid in a sample comprising:
- (a) contacting the nucleic acid with a first oligonucleotide linked to a selector tag and a second oligonucleotide linked to a peptoid detector tag, in a reaction mixture under conditions that allow the first and second oligonucleotides to specifically hybridize with the nucleic acid such that the first oligonucleotide is located immediately adjacent to the second oligonucleotide, thereby forming adjacently hybridized first and second oligonucleotides;
(b) ligating the adjacently hybridized first and second oligonucleotides to form a ligated oligonucleotide;
(c) de-linking the detector tag from the ligated oligonucleotide; and
(d) identifying the de-linked detector tag, thereby detecting a specific nucleic acid in a sample.
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Abstract
The invention provides methods of identifying one or more nucleic acids in a sample. The nucleic acids, for example, expressed genes in a cell, can be identified by contacting the nucleic acids with oligonucleotides having detector tags, and selector tags to form tagged oligonucleotides. Each nucleic acid can be uniquely identified by mass-spectrophotometric analysis of the detector tag.
25 Citations
33 Claims
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1. A method of detecting a specific nucleic acid in a sample comprising:
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(a) contacting the nucleic acid with a first oligonucleotide linked to a selector tag and a second oligonucleotide linked to a peptoid detector tag, in a reaction mixture under conditions that allow the first and second oligonucleotides to specifically hybridize with the nucleic acid such that the first oligonucleotide is located immediately adjacent to the second oligonucleotide, thereby forming adjacently hybridized first and second oligonucleotides;
(b) ligating the adjacently hybridized first and second oligonucleotides to form a ligated oligonucleotide;
(c) de-linking the detector tag from the ligated oligonucleotide; and
(d) identifying the de-linked detector tag, thereby detecting a specific nucleic acid in a sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 30, 31)
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8. A method of detecting a plurality of specific nucleic acids in a sample comprising:
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(a) contacting each specific nucleic acid with an oligonucleotide pair in a reaction mixture under conditions that allow the oligonucleotide pair to specifically hybridize to the nucleic acid such that the oligonucleotide pair members are located immediately adjacent to each other thereby forming an adjacently hybridized oligonucleotides pair, wherein each oligonucleotide pair comprises a first oligonucleotide linked to a selector tag and a second oligonucleotide linked to a peptoid detector tag;
(b) ligating each adjacently hybridized oligonucleotide pair to form one or more ligated oligonucleotides;
(c) de-linking the detector tag from the one or more ligated oligonucleotides; and
(d) identifying one or more de-linked detector tags. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 32, 33)
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18. A method of detecting a nucleic acid in a sample comprising:
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(a) amplifying the nucleic acid with a primer pair to form a dual-tagged amplification product in a reaction mixture, wherein the primer pair is a first oligonucleotide linked to a selector tag and a second oligonucleotide linked to a peptoid detector tag;
(b) de-linking the detector tag from the ligated oligonucleotide; and
(c) identifying the de-linked detector tag, thereby detecting the nucleic acid in a sample. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A method of detecting a nucleic acid in a sample comprising:
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(a) contacting the nucleic acid with an oligonucleotide linked to a peptoid detector tag under conditions that allow the oligonucleotide to specifically hybridize to the nucleic acid to form a mixture of hybridized oligonucleotide and unhybridized oligonucleotide;
(b) separating the hybridized oligonucleotide from the unhybridized oligonucleotide;
(c) de-linking the detector tag from the hybridized oligonucleotide; and
(d) identifying the de-linked detector tag, thereby detecting the nucleic acid. - View Dependent Claims (26, 27)
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28. A method of generating a double-tagged oligonucleotide duplex comprising:
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(a) contacting a single-stranded nucleic acid with a first oligonucleotide linked to a selector tag and a second oligonucleotide removably linked to a peptoid detector tag, under conditions that allow the first and second oligonucleotide to specifically hybridize to the nucleic acid such that the first oligonucleotide is located immediately adjacent to the second oligonucleotide thereby forming an adjacently hybridized oligonucleotide;
(b) ligating the first and second oligonucleotides thereby forming a duplex having detector and selector tags. - View Dependent Claims (29)
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Specification