Novel fluorescent dyes for single DNA molecule techniques.

Area of Science:

• Biochemistry
• Molecular Biology
• Microscopy

Background:

• Nucleic acid fluorescent dyes are crucial for scientific and medical imaging.
• Existing dyes often lack the signal strength and stability for single-molecule techniques.
• Novel cyanine dyes were investigated for their potential in advanced imaging.

Purpose of the Study:

• To evaluate 12 novel monomeric and homodimeric cyanine dyes for single DNA molecule imaging.
• To assess their performance on a single-molecule level, beyond bulk solution assays.
• To compare their fluorescence intensity and photostability against established dyes like YOYO-1 and POPO-3.

Main Methods:

• Testing 12 novel cyanine dyes for single-molecule imaging applications.
• Intercalating dyes into single DNA molecules stretched on a silanized surface.
• Comparing fluorescence intensity and photostability with YOYO-1 and POPO-3.

Main Results:

• All 12 novel cyanine dyes demonstrated strong emission when intercalated into single DNA molecules.
• Their signal intensity was comparable to YOYO-1.
• The dyes allowed for red filter visualization and exhibited superior photostability compared to POPO-3.

Conclusions:

• The studied cyanine dyes are suitable for fluorescent microscopy imaging of single DNA molecules.
• They offer advantages over YOYO-1 and POPO-3, particularly for red filter visualization and photostability.
• These dyes represent a promising choice for solid surface single-molecule applications requiring yellow to red DNA fluorescence.