Compositions and Methods of Use for Variant Csy4 Endoribonucleases

Tech ID: 19837 / UC Case 2010-028-0

Patent Status

Country Type Number Dated Case
United States Of America Issued Patent 9,708,646 06/18/2017 2010-028
United States Of America Issued Patent 9,605,246 03/28/2017 2010-028
United States Of America Issued Patent 9,115,348 08/25/2015 2010-028

Brief Description

DNA restriction enzymes transformed molecular biology in the 1970s by making it possible to cleave specific DNA sequences at will. Sequencing of RNA molecules currently entails copying the RNA into a DNA strand that is then sequenced by conventional methods. This approach, also known as RNASeq, is robust and can yield many millions of sequence reads. However, the necessity of generating cDNA introduces inherent bias due to sequence-dependent efficiencies of individual steps.

UC Berkeley researchers discovered variant Csy4 endoribonucleases, nucleic acids encoding the variant Csy4 endoribonucleases, and host cells genetically modified with the nucleic acids that can be used to detect the presence of a particular sequence in a polyribonucleotide, (e.g., to detect the presence of pathogen in a biological sample).  . The variant Csy4 endoribonucleases find use in a variety of applications, which are also provided. The present disclosure also provides methods of detecting a specific sequence in a target polyribonucleotide; and methods of regulating production of a target RNA in a eukaryotic cell. 

Suggested uses

  • Detect a target nucleotide (e.g., of a pathogen in a biological sample)
  • Purify a particular target RNA (or RNA protein complex) from within a complex mixture 
  • Delivery of modular components (e.g., effector domains) in conjunction with Cas9
  • Modulate expression of RNA molecules in eukaryotic cells
  • RNA processing enzyme 


  • Detects as few as a single copy of a target polyribonucleotide

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  • Doudna, Jennifer A.
  • Haurwitz, Rachel E.
  • Wiedenheft, Blake A.

Other Information


Csy4, Cas9, CRISPR, imaging

Categorized As

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