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Template-controllable rolling circle amplification for dual protein sensitive analysis.

Gang Wang1, Shi Tang2, Yixi Dong1

  • 1State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210023, P. R. China. xiangy@nju.edu.cn.

Journal of Materials Chemistry. B
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Summary
This summary is machine-generated.

This study introduces a novel method for detecting two protein biomarkers simultaneously using a direct template-controlled rolling circle amplification (RCA) technique. This advancement improves disease analysis accuracy, particularly for Alzheimer's disease biomarkers Tau and AβO.

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Area of Science:

  • Biomarker Discovery
  • Molecular Diagnostics
  • Nanotechnology

Background:

  • Conjoint analysis of multiple protein biomarkers enhances disease detection accuracy.
  • Current indirect primer-controlled rolling circle amplification (RCA) for protein detection has limitations in reaction efficiency due to probe-product binding dynamics.
  • There is a need for more efficient and sensitive methods for simultaneous detection of multiple protein biomarkers.

Purpose of the Study:

  • To develop a direct template-controlled RCA mode for simultaneous detection of two protein biomarkers.
  • To improve reaction efficiency and analytical performance compared to existing RCA methods.
  • To apply the developed method for the analysis of Alzheimer's disease biomarkers in clinical samples.

Main Methods:

  • A dual functional magnetic bead was designed for capturing two target proteins and releasing specific RCA templates.
  • Two-dimensional metal-organic framework (MOF) nanosheets were utilized as carriers and quenchers for fluorescent probes.
  • A direct template-controlled RCA reaction was employed where RCA products competed with probes on MOF nanosheets for hybridization, leading to fluorescence recovery.

Main Results:

  • The proposed method successfully achieved simultaneous detection of two protein biomarkers.
  • The direct template-controlled RCA mode demonstrated improved reaction efficiency.
  • The method exhibited excellent analytical performance and was validated for the detection of Tau and AβO in Alzheimer's disease patient cerebrospinal fluid samples.

Conclusions:

  • The developed direct template-controlled RCA method offers a sensitive and efficient approach for simultaneous protein biomarker detection.
  • This technique holds significant potential for improving the accuracy of disease diagnosis, particularly for neurodegenerative diseases like Alzheimer's.
  • The use of MOF nanosheets as carriers and quenchers is a key innovation enabling enhanced fluorescence signal recovery.