Split light up aptamers as a probing tool for nucleic acids.

Area of Science:

• Biochemistry
• Molecular Biology
• Biotechnology

Background:

• Aptamers can be engineered into fluorescent sensors by binding non-fluorescent dyes, enhancing their fluorescence.
• Existing fluorescent sensors often require direct conjugation of dyes to nucleic acids, complicating assay design and increasing costs.

Purpose of the Study:

• To provide guidance for designing split (binary) light-up aptameric sensors (SLAS) for nucleic acid analysis.
• To highlight the advantages of SLAS over monolithic fluorescent sensors for improved assay optimization and selectivity.

Main Methods:

• SLAS utilize two separate RNA or DNA strands that hybridize to a target nucleic acid sequence.
• Upon hybridization, the two strands form a dye-binding pocket, which then binds a fluorogenic organic dye.
• The binding of the dye leads to a significant increase in fluorescence, signaling the presence of the target sequence.

Main Results:

• SLAS enable cost-efficient, label-free detection of nucleic acids without the need for dye-nucleic acid conjugation.
• The split design offers simpler assay optimization and enhanced selectivity compared to monolithic fluorescent sensors.
• RNA-based SLAS can be expressed intracellularly for real-time monitoring and imaging of biological molecules.

Conclusions:

• SLAS represent a versatile and efficient platform for nucleic acid detection and analysis.
• The design principles discussed facilitate the development of novel fluorescent aptameric sensors.
• SLAS hold promise for applications in diagnostics, research, and intracellular imaging.