Selecting nucleic acids for biosensor applications.

Area of Science:

• Biotechnology
• Molecular Biology
• Biosensor Technology

Background:

• Nucleic acids, through their secondary structures, can be engineered into functional molecules like aptamers (binding) and ribozymes (catalysis).
• Existing nucleic acid biosensors often rely on labeling or specific ligand-induced conformational changes for detection.

Purpose of the Study:

• To explore the potential of engineering nucleic acid-based biosensors (aptazymes) for broad molecular recognition.
• To investigate the development of homogeneous solution-based biosensors and array formats for detecting non-nucleic acid targets.

Main Methods:

• In vitro selection techniques to generate aptamers and ribozymes with specific molecular recognition capabilities.
• Engineering aptamers and ribozymes to exhibit ligand-dependent conformational changes for signaling.
• Development of automated methods for generating aptazymes responsive to diverse biological molecules.

Main Results:

• Successful generation of nucleic acid binding species (aptamers) and catalysts (ribozymes).
• Demonstrated ability to engineer aptamers and ribozymes into biosensors capable of detecting various molecules.
• Development of biosensors that report ligand presence in homogeneous solutions via conformational changes.

Conclusions:

• Nucleic acid engineering offers a powerful strategy for creating versatile biosensors.
• Aptazymes hold promise for detecting a significant portion of an organism's proteome and metabolome using automated methods.
• Nucleic acid biosensor arrays could be developed with similar ease to DNA chips for non-nucleic acid targets.