DNAzyme-Amplified Label-Free Biosensor for the Simple and Sensitive Detection of Pyrophosphatase

Area of Science:

• Biochemistry
• Analytical Chemistry
• Biotechnology

Background:

• Pyrophosphatase (PPase) is a potential biomarker for various cancers and hyperthyroidism.
• Current PPase detection methods are complex, time-consuming, and lack sensitivity for early clinical diagnosis.

Purpose of the Study:

• To develop a sensitive and efficient DNAzyme-based biosensor for pyrophosphatase (PPase) detection.
• To overcome the limitations of existing methods for PPase analysis in clinical settings.

Main Methods:

• A DNAzyme-based fluorescent biosensor was engineered utilizing a specific substrate with an embedded fluorophore (ATMND).
• PPase activity triggers the cleavage of the DNAzyme/substrate complex, releasing the quenched fluorophore and restoring fluorescence.
• The released ATMND fluorescence intensity directly correlates with PPase activity.

Main Results:

• The developed biosensor demonstrated high sensitivity for PPase detection, with a lowest detectable concentration of 0.5 mU.
• The assay exhibited a wide linear range (0.5–1000 mU), suitable for quantitative analysis.
• The biosensor offers a single-step operation, enhancing its practicality for diagnostics.

Conclusions:

• This DNAzyme-amplified fluorescent biosensor provides a sensitive, rapid, and user-friendly platform for PPase activity detection.
• The developed method has the potential to significantly improve early clinical diagnosis for conditions associated with altered PPase levels.