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Labeling DNA Probes

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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
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Quantum Dot and Nucleic Acid Optical Readout for Cell-Free Biosensing.

Era Srivastava¹, Sara Desai¹, Meghna Thakur^2,3

¹Department of Biochemistry, Case Western Reserve University, Cleveland, Ohio 44106, United States.

ACS Nanoscience Au

|February 23, 2026

Summary

Cell-free biosensors now detect cadmium using a novel quantum dot reporter system. This quantum dot-peptide-PNA DNA dye (QD-PDD) reporter offers a more sensitive and versatile alternative to traditional fluorescent biomolecules.

Keywords:

allosteric transcription factors cadmium cell-free sensors fluorescence nucleic acids quantum dots

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Compact Quantum Dots for Single-molecule Imaging

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Published on: October 9, 2012

Area of Science:

Biotechnology
Biosensor Technology
Nanotechnology

Background:

Cell-free biosensors utilize in vitro transcription-translation systems for analyte detection, offering portability and shelf stability.
Current optical readouts, often fluorescent RNA aptamers or proteins, have limitations in multiplexing capability and low quantum yield.
Semiconductor quantum dots (QDs) offer high quantum yield and compatibility with cell-free systems.

Purpose of the Study:

To investigate the integration of a quantum dot-peptide-PNA DNA dye (QD-PDD) reporter system with cell-free heavy-metal biosensors.
To demonstrate the feasibility of using QD-PDD as a downstream reporter for analyte-triggered gene expression in cell-free systems.
To assess the performance of the QD-PDD reporter in detecting cadmium ions.

Main Methods:

Developed a QD-PDD reporter system leveraging Förster resonance energy transfer (FRET) changes triggered by expressed restriction enzymes.
Engineered a cell-free system by connecting a cadmium-sensitive operon to the expression of the restriction enzyme BamHI.
Validated the system's ability to detect cadmium ions in aqueous solutions.

Main Results:

Successfully demonstrated a FRET change in the QD-PDD reporter upon expression of BamHI, controlled by the cadmium-sensitive operon.
The integrated cell-free biosensor system effectively detected cadmium ions in cadmium chloride solutions.
Achieved a proof-of-concept for QD-PDD reporters replacing traditional fluorescent biomolecules in cell-free biosensing applications.

Conclusions:

The QD-PDD reporter system is compatible with cell-free transcription-translation systems and can be effectively coupled to analyte-responsive operons.
This QD-PDD based approach overcomes the limitations of traditional fluorescent reporters, enabling enhanced sensitivity and potential for multiplexing.
The developed system represents a significant advancement in cell-free biosensor technology for environmental monitoring and diagnostics.