ECHO probes: a concept of fluorescence control for practical nucleic acid sensing

Area of Science:

• Photophysics
• Molecular Biology
• Biotechnology

Background:

• Fluorescence-controlled nucleic acid sensing is crucial for molecular diagnostics.
• Excitonic interactions from dye aggregation offer novel sensing mechanisms.

Purpose of the Study:

• To review recent advancements in exciton-controlled hybridization-sensitive fluorescent oligonucleotide (ECHO) probes.
• To highlight the capabilities and applications of ECHO probes in nucleic acid detection.

Main Methods:

• Covalent linkage of two dye molecules (e.g., thiazole orange derivatives) to a nucleotide.
• Utilizing absorption shifts and emission switching of ECHO probes upon hybridization.
• Reviewing studies on ECHO probe modifications and applications.

Main Results:

• ECHO probes exhibit distinct spectral changes upon binding to target nucleic acids.
• The probes enable sensitive and specific detection of nucleic acid hybridization.
• Demonstrated applications include multicolor RNA imaging in living cells and gene polymorphism detection.

Conclusions:

• ECHO probes represent a significant advancement in fluorescence-based nucleic acid sensing.
• Their hybridization-sensitive fluorescence and adaptability facilitate diverse biological applications.
• Further modifications promise expanded utility in molecular diagnostics and research.