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Substrate Generation for Endonucleases of CRISPR/Cas Systems
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Functionally diverse type V CRISPR-Cas systems.

Winston X Yan1, Pratyusha Hunnewell1, Lauren E Alfonse1

  • 1Arbor Biotechnologies, Cambridge, MA 02139, USA.

Science (New York, N.Y.)
|December 8, 2018
PubMed
Summary
This summary is machine-generated.

Researchers explored novel Type V CRISPR-Cas systems, identifying Cas12c, Cas12g, Cas12h, and Cas12i. These systems show diverse DNA and RNA targeting capabilities, expanding the CRISPR toolbox for molecular biology applications.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Type V CRISPR-Cas systems utilize a single effector protein, Cas12, for RNA-guided DNA targeting.
  • While Cas12a and Cas12b are well-characterized, other Cas12 subtypes remain unexplored, hinting at functional diversity.
  • Distinct domain architectures and RuvC sequences in uncharacterized Cas12 proteins suggest novel activities.

Purpose of the Study:

  • To identify and characterize novel Cas12 proteins from Type V CRISPR-Cas systems.
  • To investigate the functional diversity and enzymatic activities of newly identified Cas12 subtypes.
  • To expand the repertoire of CRISPR-Cas tools for genome editing and molecular applications.

Main Methods:

  • Bioinformatic identification of uncharacterized Cas12 proteins.
  • Biochemical characterization of Cas12c, Cas12g, Cas12h, and Cas12i.
  • Assays to determine RNA-guided DNA interference, RNase, and DNase activities.

Main Results:

  • Cas12c, Cas12h, and Cas12i exhibit RNA-guided double-stranded DNA (dsDNA) interference.
  • Cas12i demonstrates preferential cleavage of the complementary strand, leading to dsDNA nicking.
  • Cas12g functions as an RNA-guided ribonuclease (RNase) with collateral RNase and single-strand DNase activities.

Conclusions:

  • The study reveals significant functional diversity within Type V CRISPR-Cas systems, driven by distinct evolutionary paths.
  • Newly characterized Cas12 proteins expand the capabilities of CRISPR technology.
  • These findings provide novel tools for diverse applications in molecular biology and biotechnology.