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    A new light-activated CRISPR diagnostic system, Light-Uncaged Cas13a (LUCas), precisely controls Cas13a enzyme activity. This innovation enhances infectious disease detection sensitivity and enables multiplexed viral co-infection analysis.

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    Area of Science:

    • Molecular Biology
    • Biotechnology
    • Diagnostic Assays

    Background:

    • CRISPR diagnostics, particularly using Cas13a, offer sensitive, amplification-free RNA detection via collateral cleavage.
    • Limitations include background enzyme activity and reaction initiation variability, hindering assay sensitivity and interpretation.
    • A controllable 'start' mechanism for Cas13a is needed to overcome these challenges.

    Purpose of the Study:

    • To develop a light-controlled system for precise Cas13a activation, addressing limitations in CRISPR diagnostics.
    • To enhance assay sensitivity, interpretability, and expand design possibilities for Cas13a-based detection.
    • To demonstrate novel multiplexed detection strategies using light-gated Cas13a.

    Main Methods:

    • Introduction of Light-Uncaged Cas13a (LUCas), utilizing a photocleavable interfering guide RNA (pc-igRNA) to gate Cas13a activity.
    • UV illumination to release pc-igRNA suppression, restoring Cas13a's trans-cleavage activity.
    • Quantitative kinetic analysis, limit-of-detection prediction and validation, and demonstration of temporal barcoding for multiplexed detection.

    Main Results:

    • LUCas demonstrates approximately 100-fold suppression of Cas13a trans-cleavage activity prior to photo-activation.
    • The system effectively suppresses target-independent background activity, allowing predictive sensitivity determination.
    • Experimental validation confirmed the predicted limit-of-detection, and temporal barcoding enabled multiplexed viral co-infection detection.

    Conclusions:

    • LUCas provides a robust framework for light-based, mechanistically informed control of Cas13a activity in diagnostic applications.
    • This system significantly improves sensitivity and interpretability in CRISPR-based diagnostics.
    • LUCas enables advanced multiplexed detection strategies, expanding the utility of CRISPR diagnostics for complex biological samples.