Multifunctional microfluidic chip for optical nanoprobe based RNA detection - application to Chronic Myeloid Leukemia

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Molecular Diagnostics

Background:

• Late-stage disease detection limits treatment options, increasing fatality rates.
• Point-of-care (POC) devices are crucial for accessible healthcare due to their portability, speed, and cost-effectiveness.
• Early diagnostics for diseases like chronic myeloid leukemia (CML) are vital for effective treatment.

Purpose of the Study:

• To develop and test a multifunctional microfluidic chip for rapid, amplification-free RNA optical detection.
• To demonstrate the chip's capability for early-stage screening of chronic myeloid leukemia (CML).
• To establish a proof-of-concept for advanced optical genosensors in POC applications.

Main Methods:

• A microfluidic chip was designed for passive mixing of samples, target RNA, and gold nanoprobes.
• Colorimetric properties of the mixture were analyzed using an optical fiber network to detect RNA.
• The system was validated for the rapid detection of CML RNA without requiring molecular amplification.

Main Results:

• The developed chip achieved accurate RNA detection within 3 minutes.
• High signal-to-noise ratios (up to 9 dB) were obtained.
• The method proved to be at least 10 times faster than current CML screening techniques.

Conclusions:

• The multifunctional chip enables rapid, amplification-free RNA detection for POC diagnostics.
• This technology significantly accelerates CML screening, offering a substantial improvement over existing methods.
• The study lays the groundwork for developing more sophisticated optical genosensors for various diagnostic applications.