Programmable Inhibition and Detection of RNA Viruses Using Cas13

Catherine A. Freije, Cameron Myhrvold, Chloe K. Boehm, Aaron E. Lin, Nicole L. Welch, Amber Carter, Hayden C. Metsky, Cynthia Y. Luo, Omar O. Abudayyeh, Jonathan S. Gootenberg, Nathan L. Yozwiak, Feng Zhang, Pardis C. Sabeti

Research output: Contribution to journalArticlepeer-review

255 Scopus citations


The CRISPR effector Cas13 could be an effective antiviral for single-stranded RNA (ssRNA) viruses because it programmably cleaves RNAs complementary to its CRISPR RNA (crRNA). Here, we computationally identify thousands of potential Cas13 crRNA target sites in hundreds of ssRNA viral species that can potentially infect humans. We experimentally demonstrate Cas13's potent activity against three distinct ssRNA viruses: lymphocytic choriomeningitis virus (LCMV); influenza A virus (IAV); and vesicular stomatitis virus (VSV). Combining this antiviral activity with Cas13-based diagnostics, we develop Cas13-assisted restriction of viral expression and readout (CARVER), an end-to-end platform that uses Cas13 to detect and destroy viral RNA. We further screen hundreds of crRNAs along the LCMV genome to evaluate how conservation and target RNA nucleotide content influence Cas13's antiviral activity. Our results demonstrate that Cas13 can be harnessed to target a wide range of ssRNA viruses and CARVER's potential broad utility for rapid diagnostic and antiviral drug development. Freije et al. demonstrate that Cas13 can be programmed to target and destroy the genomes of diverse mammalian single-stranded RNA viruses. They identify design principles for efficient Cas13 targeting of viral RNA and create companion Cas13-based diagnostics to rapidly measure the effects of Cas13 targeting.

Original languageEnglish (US)
Pages (from-to)826-837.e11
JournalMolecular Cell
Issue number5
StatePublished - Dec 5 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Cell Biology


  • Arenavirus
  • Cas13
  • Cas13-based detection
  • RNA interference
  • RNA viruses
  • antiviral
  • crRNA design
  • influenza virus
  • multiplexing


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