Functional nucleic acid entrapment in sol-gel derived materials.

Area of Science:

• Biochemistry
• Materials Science
• Biotechnology

Background:

• Functional nucleic acids (FNAs), including aptamers and deoxyribozymes/ribozymes, are versatile tools for molecular recognition and catalysis.
• Fluorescence-signaling FNAs show promise for biosensing, but their application in solid-phase assays is limited by RNA instability and nuclease susceptibility.
• Solid-phase immobilization methods are needed to enhance the stability and utility of FNAs in diagnostic and detection platforms.

Purpose of the Study:

• To present sol-gel entrapment as a method for immobilizing functional nucleic acids (FNAs) for solid-phase assays.
• To evaluate the stability and signaling capabilities of sol-gel entrapped FNAs, including DNA aptamers, RNA-cleaving deoxyribozymes, and RNA aptamers.
• To explore the potential of sol-gel derived materials for creating robust FNA-based biosensing devices.

Main Methods:

• Sol-gel entrapment was employed to immobilize various FNAs, including DNA aptamers, RNA-cleaving deoxyribozymes, and RNA aptamers.
• The stability of entrapped FNAs against nuclease degradation and chemical attack was assessed.
• The signaling capabilities of the immobilized FNAs within sol-gel matrices were maintained and evaluated.
• Diverse sol-gel composites, from silica to methylsilsesquioxane, were utilized to test the versatility of the entrapment method.

Main Results:

• Sol-gel entrapment successfully immobilized fluorescence-signaling DNA aptamers, RNA-cleaving deoxyribozymes, and RNA aptamers.
• The sol-gel method provided significant protection against nuclease degradation and enhanced chemical stability for the FNAs.
• Signaling capabilities of the FNAs were preserved after entrapment in various sol-gel materials.
• The method demonstrated compatibility with different sol-gel matrices, including polar silica and hydrophobic methylsilsesquioxane.

Conclusions:

• Sol-gel entrapment is an effective strategy for the solid-phase immobilization of functional nucleic acids (FNAs).
• This method enhances the stability of FNAs, overcoming limitations associated with RNA susceptibility to degradation.
• Sol-gel entrapped FNAs maintain their signaling functions, offering a promising platform for robust solid-phase biosensor development.