Programmable Split DNAzyme Modulators via Allosteric Cooperative Activation for mRNA Electrochemiluminescence...

Area of Science:

• Biotechnology and Biosensing
• Molecular Biology
• Nanotechnology

Background:

• DNAzymes offer programmability and stability for signal transduction but face challenges in catalytic efficiency and unintended activation.
• Existing DNAzyme modulators often rely on single effector activation, limiting specificity and sensitivity in complex biological matrices.
• Accurate detection of biomarkers like interleukin-6 (IL-6) mRNA is crucial for understanding biological processes and disease states.

Purpose of the Study:

• To develop a novel DNAzyme modulator, STATER, employing an allosteric cooperative activation strategy for enhanced biosensing.
• To achieve sensitive and accurate electrochemiluminescence (ECL) detection of IL-6 mRNA by overcoming limitations of conventional DNAzyme systems.
• To establish an activation threshold for IL-6 mRNA detection, reducing nonspecific activation in complex biological samples.

Main Methods:

• Designed a STATER utilizing a DNA tetrahedron scaffold with T-shaped hairpin probes (TP) and helper hairpin probes (HP).
• Incorporated apurinic/apyrimidinic endonuclease 1 (APE1) recognition sites and IL-6 mRNA binding regions into the TP.
• Implemented an allosteric cooperative activation mechanism involving toehold exchange displacement for partzyme assembly and ECL signal generation on a gold nanocluster platform.

Main Results:

• The STATER demonstrated sensitive and selective detection of IL-6 mRNA via an ECL biosensor.
• The biosensor exhibited a linear detection range from 1 × 10^-13 to 1 × 10^-7 M for IL-6 mRNA.
• Achieved a low limit of detection of 3.26 × 10^-14 M, indicating high sensitivity and specificity.

Conclusions:

• The allosteric cooperative activation strategy effectively enhances DNAzyme modulator performance for specific analyte detection.
• The developed STATER-based ECL biosensor shows significant potential for sensitive and accurate IL-6 mRNA quantification in complex biological systems.
• This approach provides a robust platform for developing advanced biosensors for various biological analytes.