Suppression of Borna Disease Virus Replication during Its Persistent Infection Using the CRISPR/Cas13b System

Area of Science:

• Virology
• Molecular Biology
• Neuroscience

Background:

• Borna disease virus 1 (BoDV-1) causes fatal encephalitis and persistent neurobehavioral abnormalities in various species.
• Damage to neural networks from BoDV-1 infection is difficult to repair, necessitating effective antiviral treatments.
• The CRISPR/Cas13 system is a novel antiviral tool, but its efficacy against persistent RNA virus infections remains unclear.

Purpose of the Study:

• To investigate the efficacy of the CRISPR/Cas13 system against persistent Borna disease virus 1 (BoDV-1) infections in neuronal cells.
• To determine if CRISPR/Cas13 can suppress viral RNA in chronically infected cells.
• To evaluate CRISPR/Cas13 as a potential therapeutic strategy for BoDV-1 and other persistent RNA virus infections.

Main Methods:

• Utilized a CRISPR/Cas13 system designed to target viral messenger RNAs (mRNAs) of BoDV-1.
• Applied the CRISPR/Cas13 system to persistently BoDV-1-infected neuronal cell cultures.
• Assessed the reduction of viral mRNAs and genomic RNA (gRNA) levels.
• Introduced the CRISPR/Cas13 system before viral infection to evaluate its prophylactic potential.

Main Results:

• The CRISPR/Cas13 system significantly reduced target viral mRNAs and genomic RNA (gRNA) in persistently infected cells.
• CRISPR/Cas13 demonstrated suppressive effects on BoDV-1 infection when administered prior to exposure.
• The study confirmed CRISPR/Cas13's effectiveness in combating BoDV-1 during both acute and persistent phases.

Conclusions:

• The CRISPR/Cas13 system is a viable tool for suppressing Borna disease virus 1 (BoDV-1) in both acute and persistent infections.
• This research validates CRISPR/Cas13's potential for treating persistent infections caused by RNA viruses.
• Findings open new therapeutic avenues for managing chronic RNA viral diseases using CRISPR/Cas13 technology.