Designing a Simple Electrochemical Genosensor for the Detection of Urinary PCA3, a Prostate Cancer Biomarker

Area of Science:

• Biomedical Engineering
• Electrochemistry
• Molecular Diagnostics

Background:

• Prostate cancer diagnosis relies on accurate biomarker detection.
• Prostate Cancer Antigen 3 (PCA3) is a key biomarker for prostate cancer.
• Existing detection methods can be complex and time-consuming.

Purpose of the Study:

• To develop a simple and sensitive electrochemical genosensor for PCA3 fragment detection.
• To compare the efficacy of two different DNA probe locations for PCA3 recognition.
• To establish a reliable method for early prostate cancer screening using urine samples.

Main Methods:

• Immobilization of thiolated single-strand DNA probes on a gold surface.
• Electrochemical detection using square wave voltammetry without a redox probe.
• Comparative analysis of two DNA probe targeting sites (bases 1-40 and 47-86) for PCA3 hybridization.

Main Results:

• Achieved limits of detection of 2.2 ng/mL (Probe 1) and 1.6 ng/mL (Probe 2).
• Demonstrated high sensitivity with values of 0.09 ± 0.01 µA⁻¹·µg⁻¹·mL and 0.10 ± 0.01 µA⁻¹·µg⁻¹·mL for Probes 1 and 2, respectively.
• Confirmed excellent specificity, distinguishing complementary PCA3 targets from non-complementary sequences.

Conclusions:

• The developed electrochemical genosensor offers a feasible and sensitive platform for PCA3 detection.
• Probe 2 (targeting bases 47-86) exhibited superior analytical performance.
• This method shows promise for non-invasive, early prostate cancer diagnosis.