Abstract
In this study, a novel electrochemical biosensor was constructed for ultrasensitive and locus-specific detection of N6-Methyladenine (m6A) in DNA using double-hindered replication and nucleic acid-coated methylene blue (MB)@Zr-MOF. Based on the combination of m6A-impeded replication and AgI-mediated mismatch replication, this mode could effectively stop the extension of the strand once DNA polymerase encountered m6A site, which specifically distinguish the m6A site from natural A site in DNA. Also, Zr-MOF with high porosity and negative surface potential features was carefully chose to load cationic MB, resulting a stable and robust MB@Zr-MOF electrochemical tag. As a result, the developed biosensor exhibited a wide linear range from 1 fM to 1 nM with detection limit down to 0.89 fM. Profiting from the high sensitivity and selectivity, the biosensing strategy revealed good applicability, which had been demonstrated by quantitating m6A DNA at specific site in biological matrix. Thus, the biosensor provides a promising platform for locus-specific m6A DNA analysis.Graphical
Highlights
Epigenetic modifications on nucleic acids could significantly regulate the long-term gene activity and expression [1,2,3]
We developed a novel electrochemical biosensor for ultrasensitive and site-specific detection of m6A DNA based on double-hindered replication and nucleic acid-functionalized methylene blue (MB)@Zr-Metal–organic frameworks (MOFs)
The linker probes (LP) was linked with MB@Zr-MOF through Zr–P bonds, forming LP@MB@ Zr-MOF electrochemical tag
Summary
Epigenetic modifications on nucleic acids could significantly regulate the long-term gene activity and expression [1,2,3]. MOF-based strategies have been developed for the detection of m 6A DNA [35, 36], these methods still face the problems: low sensitivity, high cost owing to the usage of antibody, and the failure of sensing specific m6A sites. Exploring MB@ Zr-MOF as electrochemical tag provides a new way for developing m6A DNA detection method.
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