Development of Electrochemical Biosensor for miR204-Based Cancer Diagnosis

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Analytical Chemistry

Background:

• Global cancer burden necessitates early diagnostic tools.
• Delayed diagnosis significantly impacts patient survival rates.
• MicroRNA-204 (miR-204) is a promising biomarker dysregulated across various cancers.

Purpose of the Study:

• To develop and characterize an electrochemical biosensor for sensitive and early detection of miR-204.
• To utilize gold nanoparticles for enhanced biosensor performance.
• To establish a cost-effective and rapid diagnostic method for cancer screening.

Main Methods:

• Fabrication of a carbon screen-printed electrode modified with gold nanoparticles.
• Immobilization of a single-stranded DNA probe specific to miR-204.
• Characterization of gold nanoparticles using UV-visible spectroscopy and transmission electron microscopy.
• Electrochemical detection of miR-204 using cyclic voltammetry in fetal bovine serum.

Main Results:

• Synthesized spherical gold nanoparticles with sizes ranging from 7-28 nm.
• Achieved high sensitivity of 8.86 µA/µg/µL/cm² for miR-204 detection.
• Demonstrated a wide detection range from 15.5 aM to 15.5 nM.
• Established a low detection limit suitable for early cancer diagnosis.

Conclusions:

• The developed gold nanoparticle-based electrochemical biosensor offers a highly sensitive platform for miR-204 quantification.
• This technology holds significant potential for early cancer diagnosis and screening.
• The biosensor's performance characteristics support its application in clinical settings for improved patient outcomes.