Electrochemical sensor using intercalative, redox-active moieties
First Claim
1. A composition comprising:
- a first single stranded nucleic acid hybridized to a second single stranded nucleic acid forming a nucleic acid duplex, said nucleic acid duplex containing one or more electron donor moieties and one or more electron acceptor moieties combined therewith, wherein one of the electron donor or acceptor moieties is an electrode and the other electron donor or acceptor moiety is an intercalating intercalative, redox-active moiety, wherein said nucleic acid duplex comprises one or more base stacking perturbations, and wherein the presence of the one or more base stacking perturbations reduces charge transport between the intercalator and the electrode, as compared to the charge transport that occurs in the absence of the base stacking perturbations.
3 Assignments
0 Petitions
Accused Products
Abstract
Compositions and methods for electrochemical detection and localization of genetic point mutations and other base-stacking perturbations within oligonucleotide duplexes adsorbed onto electrodes and their use in biosensing technologies are described. An intercalative, redox-active moiety (such as an intercalator or nucleic acid-binding protein) is adhered and/or crosslinked to immobilized DNA duplexes at different separations from an electrode and probed electrochemically in the presence or absence of a non-intercalative, redox-active moiety. Interruptions in DNA-mediated electron-transfer caused by base-stacking perturbations, such as mutations or binding of a protein to its recognition site are reflected in a difference in electrical current, charge and/or potential.
-
Citations
19 Claims
-
1. A composition comprising:
a first single stranded nucleic acid hybridized to a second single stranded nucleic acid forming a nucleic acid duplex, said nucleic acid duplex containing one or more electron donor moieties and one or more electron acceptor moieties combined therewith, wherein one of the electron donor or acceptor moieties is an electrode and the other electron donor or acceptor moiety is an intercalating intercalative, redox-active moiety, wherein said nucleic acid duplex comprises one or more base stacking perturbations, and wherein the presence of the one or more base stacking perturbations reduces charge transport between the intercalator and the electrode, as compared to the charge transport that occurs in the absence of the base stacking perturbations. - View Dependent Claims (2, 3, 4, 5, 16, 17)
-
6. A sensor comprising:
-
(a) an electrode;
(b) a nucleic acid duplex deposited onto at least one surface of said electrode, wherein said nucleic acid duplex is comprised of a first single-stranded nucleic acid hybridized to a second single-stranded nucleic acid forming a nucleic acid duplex which comprises one or more base-stacking perturbations; and
(c) an intercalating intercalative, redox-active moiety contacting said nucleic acid duplex, wherein the presence of the one or more base stacking perturbations reduces charge transport between the intercalator and the electrode, as compared to the charge transport that occurs in the absence of the base stacking perturbations. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 18, 19)
-
Specification