Analytical application of host-guest chemistry using in vitro selection

Area of Science:

• Biochemistry
• Molecular Biology
• Assay Development

Background:

• Traditional immunoassays rely on antibodies for molecular detection.
• Developing alternative recognition elements is crucial for expanding assay capabilities.
• The need for specific and sensitive detection methods in diagnostics and research is ongoing.

Purpose of the Study:

• To describe a novel bioassay system utilizing oligodeoxyribonucleotides (DNA) as recognition elements.
• To demonstrate the selection and application of DNA aptamers for specific molecular targets.
• To establish a DNA-based detection system as an alternative to antibody-based assays.

Main Methods:

• In vitro selection (SELEX) was employed to isolate DNA sequences with high affinity for target molecules.
• Selected DNA aptamers were labeled with biotin or fluorescent molecules.
• The labeled DNA aptamers were utilized in a bioassay format for target molecule detection.

Main Results:

• Specific DNA aptamers were successfully selected for folic acid and thyroxine.
• The DNA aptamers demonstrated selective binding to their intended target molecules.
• The labeled DNA aptamers enabled the detection of target molecules in the assay system.
• The DNA aptamers exhibited strict recognition of target molecules with similar chemical structures.

Conclusions:

• Oligodeoxyribonucleotides can be effectively used as recognition elements in bioassays, replacing traditional antibodies.
• This DNA-based bioassay system provides a viable alternative for the detection of specific molecules.
• The system shows promise for applications requiring high specificity in molecular recognition.