Development of fluorescence-based nucleic acid blot hybridization method using Cy5.5 labeled DNA probes

Area of Science:

• Molecular Biology
• Biotechnology
• Biochemistry

Background:

• Near-infrared (NIR) fluorophores offer advantages for bioimaging, including deep tissue penetration and reduced autofluorescence.
• DNA probes are essential tools for detecting specific nucleic acid sequences.

Purpose of the Study:

• To develop and validate NIR fluorescent cyanine dye Cy5.5-labeled DNA probes for nucleic acid blot hybridization.
• To assess the specificity and sensitivity of these probes in genetic analysis.

Main Methods:

• Labeling DNA probes with the NIR fluorescent cyanine dye Cy5.5.
• Performing Southern blot and Northern blot hybridizations.
• Utilizing cellulolytic bacterium Ruminiclostridium cellulolyticum as a model organism.

Main Results:

• Demonstrated high specificity and sensitivity of Cy5.5-labeled DNA probes in Southern and Northern blot analyses.
• Successfully identified gene disruption via ClosTron, analyzed differential gene transcription, and confirmed RNA cleavage.
• Cy5.5-labeled probes showed superior simplicity, economy, and versatility compared to other nonradioactive probes.

Conclusions:

• Cy5.5-labeled DNA probes are effective and advantageous for nucleic acid blot hybridization.
• This method provides a simple, economical, and versatile alternative for genetic analysis and bioimaging applications.