Subcellular Tandem-Activated Signal Amplification for Spatially Precise Molecular Imaging in Mitochondria

Area of Science:

• Molecular Imaging
• Cellular Biology
• Biotechnology

Background:

• Current DNA-based signal amplification methods for live-cell imaging lack subcellular resolution due to poor spatial precision.
• Accurate localization of molecular signals within specific cellular compartments is crucial for understanding complex biological processes.

Purpose of the Study:

• To develop a spatially selective signal amplification technology for high-resolution molecular imaging within subcellular compartments, such as mitochondria.
• To enable in situ monitoring of adenosine triphosphate (ATP) dynamics and correlated imaging of microRNA in live cells.

Main Methods:

• Integration of ribosomal RNA (rRNA)-activated target-aptamer recognition with enzyme-mediated cascade signal amplification.
• Development of a tandem-regulated system for spatially controlled signal amplification.
• Re-engineering the sensor for correlated imaging of mitochondrial ATP and microRNA.

Main Results:

• Demonstrated in situ imaging of ATP within defined subcellular compartments (mitochondria) and membraneless regions (cytosol) with enhanced spatial precision.
• Successfully monitored ATP dynamics during drug intervention, showcasing improved sensitivity.
• Achieved correlated imaging of mitochondrial ATP and microRNA using the re-engineered cascade-regulated sensor.

Conclusions:

• The developed technology provides a powerful and modular tool for precise molecular imaging at the subcellular level.
• This platform significantly enhances the study of energy metabolism and regulatory networks in various cellular environments.
• The approach offers improved spatial resolution and sensitivity for live-cell molecular imaging applications.