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Metal-organic framework-based molecular beacons for multiplexed DNA detection by synchronous fluorescence analysis
1Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P.R. China. zhkhe@whu.edu.cn.
The Analyst
|February 14, 2014
Summary
We developed a novel sensor using metal-organic frameworks (MOFs) and DNA to detect multiple DNA sequences simultaneously. This biosensor shows high sensitivity and specificity for detecting both Hepatitis B Virus (HBV) and Human Immunodeficiency Virus (HIV) DNA.
Area of Science:
- Materials Science
- Biotechnology
- Analytical Chemistry
Background:
- Metal-organic frameworks (MOFs) offer unique properties for sensor development.
- Oligonucleotide-based sensors provide high specificity for target detection.
- Multiplexed detection is crucial for comprehensive disease diagnostics.
Purpose of the Study:
- To develop a novel sensor for simultaneous, sequence-specific DNA detection.
- To utilize a two-dimensional MOF combined with hairpin-structured oligonucleotides.
- To demonstrate the sensor's feasibility for detecting Hepatitis B Virus (HBV) and Human Immunodeficiency Virus (HIV) DNA fragments.
Main Methods:
- Fabrication of a sensor platform (MOF-MBs) integrating N,N-bis(2-hydroxy-ethyl)dithiooxamidato copper(II) MOF with hairpin-structured fluorescent oligonucleotides.
- Design of specific oligonucleotide probes for HBV (T1) and HIV (T2) sequences.
- Utilizing the MOF as a nanoscaffold and nanoquencher, with fluorescence recovery upon target binding.
- Employing synchronous scanning fluorescence spectrometry for multiplexed detection.
Main Results:
- The MOF-MBs sensor successfully detected specific DNA targets (HBV T1 and HIV T2) with no cross-reactivity.
- Fluorescence intensity showed a linear dependence on target DNA concentration (1-10 nM).
- Achieved low detection limits: 0.87 nM for T1 and 0.22 nM for T2.
- Demonstrated successful simultaneous detection of multiplexed DNA as a proof of concept.
Conclusions:
- The developed MOF-MBs sensor platform enables sensitive and specific simultaneous detection of multiplexed DNA.
- This approach offers a promising strategy for advanced molecular diagnostics.
- The sensor design highlights the synergistic integration of MOFs and oligonucleotides for biosensing applications.
