Electrochemical detection of nucleic acid sequences
DCFirst Claim
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1. A method of detecting a target molecule having at least one selected nucleic acid or protein segment, comprising:
- (a) interacting a bioreporter molecule attached to a working electrode surface with the target molecule to form a complex;
(b) adding a reporter molecule that can be electrochemically oxidized or reduced upon interaction with said complex;
(c) applying a pulse of potential to the working electrode that electrochemically oxidizes or reduces the reporter molecule;
(d) repeating step (c); and
(e) measuring the current close to the end of step (c) wherein said current is indicative of the presence of the target molecule.
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Abstract
An electrochemical detection system which specifically detects selected nucleic acid segments is described. The system utilizes biological probes such as nucleic acid or peptide nucleic acid probes which are complementary to and specifically hybridize with selected nucleic acid segments in order to generate a measurable current when an amperometric potential is applied. The electrochemical signal can be quantified.
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Citations
27 Claims
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1. A method of detecting a target molecule having at least one selected nucleic acid or protein segment, comprising:
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(a) interacting a bioreporter molecule attached to a working electrode surface with the target molecule to form a complex;
(b) adding a reporter molecule that can be electrochemically oxidized or reduced upon interaction with said complex;
(c) applying a pulse of potential to the working electrode that electrochemically oxidizes or reduces the reporter molecule;
(d) repeating step (c); and
(e) measuring the current close to the end of step (c) wherein said current is indicative of the presence of the target molecule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
(a) incubating the target molecule and the bioreporter molecule under conditions to form a primer extended molecule; and
(b) detecting the presence of the primer extended molecule.
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20. The method of claim 19 wherein the primer extended molecule is labeled.
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21. The method of claim 19 wherein a single primer is used.
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22. The method of claim 19 wherein the bioreporter is extended before binding to the working electrode.
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23. The method of claim 15 wherein the bioreporter has a blocked 3′
- -end.
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24. The method of claim 15 wherein the detector probe comprises a 3′
- -hydroxyl group.
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25. The method of claim 1 or claim 8 wherein the target molecule is a nucleic acid obtained from a DNA sequence comprising a deletion, insertion or single base alteration.
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26. The method of claim 19 wherein the primer extended molecule is formed by enzyme catalysis.
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27. The method of claim 26 wherein the enzyme is a DNA polymerase, an RNA polymerase or a reverse transcriptase.
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8. A method of detecting a target molecule having at least one selected nucleic acid or protein segment, comprising:
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(a) interacting a bioreporter molecule attached to a working electrode surface with the target molecule to form a complex;
(b) adding a reporter molecule that can be electrochemically reduced or oxidized upon interaction with said complex;
(c) applying a first potential to the working electrode at or close to the open circuit potential;
(d) measuring current close to the end of step (c);
(e) applying a second potential or potential pulse to the working electrode that electrochemically oxidizes or reduces the reporter molecule at or near the electrode surface;
(f) measuring a current close to the end of step (e); and
(g) determining a signal by subtracting the current measured in step (d) from the current measured in step (f);
wherein the signal indicates the presence of said target molecule. - View Dependent Claims (9, 10, 11, 12)
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Specification