Fingerprinting Fluorescent In Situ Hybridization Enables Multiplexed Identification of Pathogenic Bacteria

Area of Science:

• Microbiology
• Molecular Biology
• Biotechnology

Background:

• Conventional Fluorescence in situ hybridization (FISH) offers specific pathogenic bacteria detection but suffers from low sensitivity and multiplexing limitations.
• These limitations hinder broader applications in clinical diagnostics and microbial studies.

Purpose of the Study:

• To develop a novel Fingerprinting FISH (FinFISH) strategy using DNA self-assembly for enhanced multiplexed pathogenic bacteria detection.
• To overcome the throughput bottleneck of conventional FISH and improve scalability.

Main Methods:

• FinFISH employs combinatorial labeling with three distinct fluorophores (FAM, Cy3, Cy5) to generate unique fluorescent fingerprints for each bacterial species.
• A custom-designed enclosed chip with multichannel reaction chambers facilitates parallel processing and simplifies operations.

Main Results:

• FinFISH successfully identified pathogenic bacteria in simulated sputum and urine samples, demonstrating applicability to clinical samples.
• The method provides semiquantitative insights into mixed infections and overcomes limitations of fluorescence channel numbers.

Conclusions:

• FinFISH represents a scalable and sensitive approach for multiplexed pathogenic bacteria detection, advancing beyond conventional FISH.
• Future integration with expanded probe design and AI analysis holds potential for improved clinical diagnostics and microbial research.