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In vitro programmable DNA cleavage by a eukaryotic Argonaute.

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This study reveals that eukaryotic Argonautes (eAgos) can cleave DNA targets. The CsAgo protein efficiently degrades DNA and RNA, expanding applications for DNA manipulation and gene silencing.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Eukaryotic Argonautes (eAgos) typically use RNA guides for RNA targets in gene silencing.
  • The DNA-cleaving ability of eAgos has been unclear.
  • Understanding eAgo functions beyond RNA silencing is crucial for expanding their applications.

Purpose of the Study:

  • To characterize the DNA and RNA cleavage capabilities of CsAgo, an eAgo from a thermophilic eukaryote.
  • To explore CsAgo's potential in DNA manipulation and nucleic acid detection.
  • To expand the understanding of eAgo functions and applications.

Main Methods:

  • In vitro characterization of CsAgo activity with DNA and RNA guides and targets.
  • Assessing cleavage activity across a range of temperatures (20-90°C).
  • Development of a CsAgo-based nucleic acid detection assay.

Main Results:

  • CsAgo exhibits robust RNA cleavage activity (20-90°C) and ssDNA cleavage guided by RNA (20-50°C).
  • CsAgo effectively cleaves ssDNA, plasmid dsDNA, and linear dsDNA using DNA guides at ≥80°C.
  • A CsAgo-based detection method achieved high sensitivity (six copies/reaction).

Conclusions:

  • Eukaryotic Argonautes, like CsAgo, possess DNA-targeting and cleavage capabilities.
  • CsAgo's versatility in cleaving DNA and RNA expands its utility in molecular biology, including cloning and diagnostics.
  • This research broadens the scope of eAgos for DNA manipulation and highlights their potential in novel biotechnological applications.