CRISPR Sensor Detects Lung Biomarkers at Sub‑Attomolar
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- Shenzhen University researchers led by Han Zhang built a light‑based sensor that integrates DNA tetrahedrons, quantum dots, and CRISPR‑Cas12a to generate a second‑harmonic‑generation (SHG) optical signal.
- SHG sensor detects the lung‑cancer microRNA biomarker miR‑21 in human serum at sub‑attomolar concentrations, producing a clear measurable signal even when only a few molecules are present.
- CRISPR‑Cas12a cleaves the DNA strands anchoring quantum dots upon target binding, causing a drop in SHG intensity that serves as the detection readout without chemical amplification.
- DNA tetrahedrons precisely position quantum dots nanometer‑scale from a molybdenum disulfide (MoS₂) surface, boosting the local optical field and enhancing SHG signal strength.
- Programmable platform is capable of being reprogrammed to target other biomarkers, such as viruses, bacteria, environmental toxins, and Alzheimer's‑disease‑related molecules.
- Research team plans to miniaturize the optical system into a portable device for bedside, outpatient, or remote use.
Why it matters: Patients gain a faster, less invasive diagnostic tool that can reveal cancer when tumors are too small for CT scans, while clinicians obtain a high‑precision assay that sidesteps costly imaging and chemical amplification, potentially lowering treatment costs and improving outcomes.
