Global HCV Burden and Detection Challenges

Over 170 million people worldwide are infected with the Hepatitis C Virus (HCV), a single-stranded positive-sense RNA virus. Chronic infection often leads to severe liver diseases, including chronic hepatitis, cirrhosis, and liver cancer. Currently, the most common HCV detection methods—fluorescence quantitative PCR and ELISA—are widely used in China. However, these techniques are complex, time-consuming, and expensive, limiting their accessibility for large-scale screening and real-time monitoring.

G-Quadruplex – A New Target for HCV Detection

Recent studies have identified a functional nucleic acid topological structure—the G-quadruplex—within the highly conserved region of the HCV RNA genome. This discovery opens new avenues for functional nucleic acid-based viromics research and the development of innovative HCV detection strategies. G-quadruplex fluorescent dyes are designed to selectively bind to these structures and produce enhanced fluorescence signals. However, traditional G-quadruplex probes suffer from poor cell membrane permeability, making them unsuitable for direct live-cell imaging applications.

Development and Imaging Capabilities of ThT-NE

Professor Zhou Nie's team at Hunan University developed a novel live-cell G-quadruplex-targeting fluorescent probe—named ThT-NE. This probe targets G-quadruplex structures to enable highly sensitive imaging of single-stranded RNA viruses (such as HCV) within host living cells. ThT-NE allows direct visualization of the spatiotemporal dynamics of viral RNA, helping researchers monitor viral replication and intercellular infection processes in real time

Key Features and Application Value of ThT-NE

The ThT-NE probe offers three key advantages for live-cell imaging:

• High Specificity: Exhibits strong fluorescence lighting ability specifically for nucleic acid G-quadruplex structures in living cells, with fluorescence enhancement up to 1,700-fold;

• Excellent Cell Membrane Permeability: Effectively crosses cell membranes to enable intracellular targeting;

• Outstanding Signal-to-Noise Ratio: Delivers clear and reliable imaging results for real-time viral RNA tracking.

ThT-NE represents a breakthrough in live-cell viral RNA imaging, providing researchers with a powerful tool to study HCV infection dynamics and develop better detection methods.

Prof. Zhou Nie Professor Zhou Nie currently serves as Deputy Dean of the Graduate School and Director of the Academic Degree Office at Hunan University. He is also the Director of the Hunan Provincial Key Laboratory of Biomacromolecular Chemical Biology. His research focuses on fundamental life analytical chemistry, systematically developing biomolecular tools and their applications in life analysis to address key mechanisms in biomedicine.

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