Functional nucleic acid biosensors utilizing rolling circle amplification

Area of Science:

• Biotechnology
• Biosensor Technology
• Molecular Diagnostics

Background:

• Functional nucleic acids (FNAs), such as DNA aptamers and DNAzymes, are crucial molecular recognition elements.
• Developing point-of-care (POC) sensors with FNAs faces challenges in detecting low analyte levels while maintaining speed and usability.
• Rolling circle amplification (RCA) is a key isothermal nucleic acid amplification technique for ultrasensitive detection.

Purpose of the Study:

• To review the design considerations for FNA-coupled biosensors utilizing RCA.
• To explore methods for regulating RCA with FNAs and detecting RCA outputs for non-nucleic acid targets.
• To summarize recent advancements in portable POC devices incorporating RCA and identify future challenges and opportunities.

Main Methods:

• Investigating FNA as input regulators for RCA.
• Examining diverse RCA amplification modes.
• Describing methods for detecting RCA reaction outputs.
• Reviewing portable optical and electrochemical POC devices integrating RCA.

Main Results:

• FNAs can effectively regulate RCA for sensitive detection of various targets.
• Combinations of FNA and RCA strategies allow for the detection of non-nucleic acid analytes.
• Progress has been made in developing portable POC devices that leverage RCA technology.

Conclusions:

• FNA-RCA coupling offers a powerful strategy for ultrasensitive analyte detection in POC settings.
• Optimized design of FNA-RCA systems is critical for achieving high performance in portable biosensors.
• Further development is needed to address challenges and capitalize on opportunities in FNA-RCA based POC diagnostics.