ClampFISH detects individual nucleic acid molecules using click chemistry-based amplification.

Area of Science:

• Molecular Biology
• Biotechnology
• Cell Biology

Background:

• Traditional fluorescence in situ hybridization (FISH) methods suffer from low signal intensity and non-specific probe binding.
• Detecting single nucleic acids in cells and tissues requires highly sensitive and specific molecular probes.

Purpose of the Study:

• To develop a novel fluorescence detection method for nucleic acids with high specificity and signal amplification.
• To overcome the limitations of existing FISH techniques for cellular and tissue analysis.

Main Methods:

• Developed click-amplifying FISH (clampFISH), utilizing 'C'-shaped probes that hybridize to target nucleic acid sequences.
• Employed bio-orthogonal click chemistry to ligate probe ends, locking them to the target and enabling iterative signal amplification.
• Demonstrated probe modularity for multiplexed RNA and DNA detection and stability in expansion microscopy.

Main Results:

• Achieved high-gain (>400-fold) signal amplification, surpassing conventional FISH sensitivity.
• Enabled detection of RNA species using low-magnification microscopy and RNA-based flow cytometry.
• Showcased successful application in diverse biological samples, including tissue specimens.

Conclusions:

• ClampFISH offers a powerful and versatile tool for sensitive and specific nucleic acid detection in various biological contexts.
• The method's high signal amplification and specificity open new avenues for molecular diagnostics and research.
• ClampFISH represents a significant advancement over traditional FISH techniques for visualizing nucleic acids in cells and tissues.