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Pyrococcus furiosus Argonaute-mediated nucleic acid detection.

Ruyi He1, Longyu Wang1, Fei Wang1

  • 1State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, Hubei, People's Republic of China. malixing@hubu.edu.cn chaozhai@hubu.edu.cn.

Chemical Communications (Cambridge, England)
|October 8, 2019
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Summary

Short DNA fragments from Pyrococcus furiosus Argonaute (PfAgo) trigger further DNA cleavage. This discovery enabled a sensitive diagnostic tool, PfAgo-mediated Nucleic acid Detection (PAND), for detecting DNA and mutations.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Biochemistry

Background:

  • Argonaute proteins are key players in RNA interference pathways.
  • The DNA-cleavage activity of Pyrococcus furiosus Argonaute (PfAgo) is well-established.
  • Understanding the full catalytic potential of PfAgo is crucial for novel applications.

Purpose of the Study:

  • To investigate the potential for short single-stranded DNA generated by PfAgo to initiate secondary cleavage events.
  • To develop a novel molecular diagnostic method based on this principle.
  • To evaluate the sensitivity, specificity, and multiplexing capabilities of the developed diagnostic method.

Main Methods:

  • Utilizing purified Pyrococcus furiosus Argonaute (PfAgo) enzyme.
  • Generating short single-stranded DNA fragments to assess secondary cleavage.
  • Establishing the PfAgo-mediated Nucleic acid Detection (PAND) assay.
  • Testing PAND with varying DNA concentrations, single-nucleotide mutants, and multiplexed targets.

Main Results:

  • Demonstrated that short single-stranded DNA produced by PfAgo can indeed initiate a second round of DNA cleavage.
  • Developed the PfAgo-mediated Nucleic acid Detection (PAND) assay, achieving attomolar sensitivity for DNA detection.
  • Showcased the ability of PAND to accurately distinguish between single-nucleotide mutants.
  • Successfully performed multiplexed detection of multiple DNA targets simultaneously.

Conclusions:

  • The catalytic activity of PfAgo extends to initiating secondary cleavage, offering a novel molecular mechanism.
  • PfAgo-mediated Nucleic acid Detection (PAND) represents a highly sensitive and specific platform for molecular diagnostics.
  • PAND has significant potential for applications in genetic analysis, disease detection, and beyond.