Protection of animals against devastating RNA viruses using CRISPR-Cas13s

Area of Science:

• Molecular Biology
• Biotechnology
• Virology

Background:

• CRISPR-Cas systems, originally bacterial immunity mechanisms, are now repurposed for gene editing and pathogen control in eukaryotes.
• CRISPR-Cas13 systems specifically target single-strand RNA, showing promise for antiviral applications.
• Foot-and-mouth disease virus (FMDV) is a significant animal pathogen with diverse strains and wide geographical distribution.

Purpose of the Study:

• To investigate the efficacy of various CRISPR-Cas13 orthologs in targeting and suppressing foot-and-mouth disease virus (FMDV).
• To compare the antiviral performance of CRISPR-Cas13 systems with RNA interference (RNAi) technology.
• To establish a flexible biotechnological strategy for combating animal infectious RNA viruses.

Main Methods:

• Application of different Cas13 orthologs from CRISPR system type VI (subtype A/B/D) for FMDV knockdown.
• Design of programmable CRISPR RNAs targeting conserved FMDV genome regions.
• Experimental comparison of CRISPR-Cas13 and RNAi silencing efficiencies using optimized short hairpin RNAs.

Main Results:

• All tested Cas13 orthologs successfully targeted and repressed multiple FMDV serotypes.
• The CRISPR-Cas13 approach demonstrated potential for broad-spectrum activity against FMDV strains by targeting ultra-conserved genomic regions.
• CRISPR-Cas13 achieved silencing efficiencies comparable to RNAi.

Conclusions:

• Various Cas13 enzymes are effective for suppressing FMDV, offering a flexible antiviral strategy.
• This study highlights the potential of CRISPR-Cas13 technology for controlling diverse animal RNA viruses.
• The findings contribute to an underdeveloped field in biotechnology, expanding options for animal disease management.