Analytical chemistryMar 30, 2026

Controlled Activation of CRISPR/Cas12a Using a Programmable DNA Switch for Electrochemical Detection of Genetic Variations

CRISPR Gene Editing Weekly Brief ↗PubMed ↗DOI ↗

Updated Mar 31, 2026

Abstract

The platform achieved reliable discrimination of mutation abundances down to 0.1%.

A programmable DNA dumbbell probe regulates CRISPR/Cas12a activation by acting as a conformational energy-barrier regulator.
The closed-loop dumbbell design effectively shields the crRNA-activating sequence, raising the activation threshold to suppress nonspecific triggering.
Precise SNP hybridization leads to a conformational change that activates the CRISPR system.
Nucleic acid-functionalized FeCo nanozymes enhance analytical sensitivity and reliability as catalytic signal transducers.
The approach is validated with soybean genomic DNA samples, demonstrating its robustness and practical applicability.

Simplified

Single-nucleotide polymorphism (SNP) genotyping is crucial for genetic research and precision medicine, yet reliable discrimination of single-base variants in complex genomic backgrounds remains analytically challenging. Although CRISPR/Cas12a-based biosensing offers high sequence specificity, its intrinsic mismatch tolerance often leads to nonspecific activation by wild-type sequences, thereby compromising SNP fidelity. Herein, we report a highly sensitive electrochemical sensing platform based on a programmable DNA dumbbell (Dum) probe that functions as a conformational energy-barrier regulator of CRISPR/Cas12a activation. The closed-loop dumbbell architecture sterically shields the crRNA-activating sequence, establishing a high activation threshold that suppresses nonspecific Cas12a triggering. Only precise SNP hybridization induces a thermodynamically favorable conformational rearrangement, releasing the mediator and transitioning the CRISPR system from an inactive to an active state. To further enhance analytical sensitivity and reliability, nucleic acid-functionalized FeCo nanozymes were incorporated as catalytic signal transducers, enabling a self-validating dual-mode signal electrochemical readout through intrinsic metal redox and HOelectrocatalysis. The resulting platform achieved reliably discriminates mutation abundances down to 0.1%. Validation using soybean genomic DNA samples demonstrates the robustness and practical applicability of the proposed strategy. This work establishes a conformational energy-barrier-regulated CRISPR activation paradigm, providing a generalizable analytical framework for high-fidelity SNP genotyping in molecular breeding and clinical diagnostics. 2 2

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Controlled Activation of CRISPR/Cas12a Using a Programmable DNA Switch for Electrochemical Detection of Genetic Variations

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