DNA nanodevices monitored with fluorogenic looped-out 2-aminopurine

Area of Science:

• Biochemistry
• Nanotechnology
• Molecular Biology

Background:

• DNA nanodevices offer precise molecular tools.
• Monitoring their behavior is crucial for applications.
• Existing methods have limitations in efficiency and quencher requirements.

Purpose of the Study:

• To develop a novel, efficient, and quencher-free method for monitoring DNA nanodevices.
• To utilize the unique fluorescence properties of looped-out 2-aminopurine (2-AP) for this purpose.
• To demonstrate the versatility of this approach in various DNA nanostructures.

Main Methods:

• Investigated the fluorescence intensity of looped-out 2-AP in different DNA structures (G-quadruplexes, triplexes, duplexes) compared to single- and double-stranded DNA.
• Exploited reduced base stacking in looped-out 2-AP environments to enhance fluorescence.
• Developed and tested DNA nanoplatforms for disease gene detection and a triplex nanoswitch using 2-AP as a reporter.

Main Results:

• Looped-out 2-AP consistently showed higher fluorescence intensity in G-quadruplexes, triplexes, and duplexes due to reduced base stacking and weaker quenching.
• The strategy successfully monitored the behavior of constructed DNA nanodevices, including gene detection platforms and a nanoswitch.
• 2-AP demonstrated good photostability and efficient quenching via base-pairing, functioning as a quencher-free reporter.

Conclusions:

• Fluorogenic looped-out 2-AP provides a powerful and versatile tool for monitoring diverse DNA nanodevices.
• This method offers an efficient, quencher-free alternative to conventional fluorescence labeling techniques.
• The approach holds significant promise for applications in molecular diagnostics and nanotechnology.