Method to minimize ozone effect on Cy5 fluorescent intensity in DNA microarrays

Area of Science:

• Biotechnology
• Molecular Biology
• Analytical Chemistry

Background:

• Cyanine 5 (Cy5) is a vital fluorescent dye for microarray analysis.
• Atmospheric ozone rapidly degrades Cy5 during post-hybridization washes, causing significant loss of fluorescent intensity.
• This degradation compromises the reliability and accuracy of microarray data.

Purpose of the Study:

• To develop a method to protect Cy5 dye from ozone-induced degradation during microarray post-hybridization washes.
• To enhance the stability of fluorescent signals in microarray experiments.
• To ensure consistent and reliable microarray results under varying atmospheric ozone conditions.

Main Methods:

• Microarray slides were coated with sodium dodecyl sulfate (SDS) solution during post-hybridization washes.
• Fluorescent intensities of Cy5 dye on coated and uncoated slides were compared.
• Microarray experiments were conducted over a year to assess the long-term effectiveness of the SDS coating against seasonal ozone variations.

Main Results:

• Coating microarray slides with SDS solution significantly stabilized Cy5 fluorescent intensities compared to uncoated slides.
• Consistent results were achieved throughout the year, demonstrating the effectiveness of the SDS coating despite seasonal fluctuations in atmospheric ozone levels.
• The SDS coating effectively mitigated the rapid degradation of Cy5 dye.

Conclusions:

• Sodium dodecyl sulfate (SDS) coating is an effective strategy to protect Cyanine 5 (Cy5) dye from atmospheric ozone degradation in microarray analysis.
• This method enhances the stability of fluorescent signals, leading to more reliable and reproducible microarray data.
• The protective measure ensures consistent performance of Cy5 dye in microarrays, regardless of environmental ozone levels.