Mobile-CRISPRi protocol optimization for Vibrionaceae

Area of Science:

• Microbiology
• Molecular Biology
• Bacterial Genetics

Background:

• Mobile clustered regularly interspaced palindromic repeats interference (Mobile-CRISPRi) is a validated technique for reducing bacterial gene expression.
• The system relies on a deactivated Cas9 protein and guide RNA, both inducible by isopropyl β-D-1-thiogalactopyranoside.
• Essential components are integrated into the bacterial chromosome using Tn7 transposition.

Purpose of the Study:

• To optimize and adapt the Mobile-CRISPRi system for efficient application in various Vibrio species.
• To enhance the utility of Mobile-CRISPRi for genetic manipulation in medically and environmentally relevant Vibrio bacteria.

Main Methods:

• Adaptation of existing Mobile-CRISPRi protocols for Vibrio species.
• Integration of deactivated Cas9, guide RNA, and Tn7 transposition elements into the Vibrio chromosome.
• Induction of gene knockdown using isopropyl β-D-1-thiogalactopyranoside.

Main Results:

• Successfully optimized Mobile-CRISPRi for gene knockdown in multiple Vibrio species.
• Demonstrated the inducible nature of gene silencing mediated by deactivated Cas9 and guide RNA.
• Confirmed stable integration of the Mobile-CRISPRi system into the Vibrio chromosome via Tn7 transposition.

Conclusions:

• The optimized Mobile-CRISPRi system provides a robust tool for gene expression knockdown in diverse Vibrio species.
• This advancement facilitates functional genomic studies and genetic engineering in Vibrio bacteria.
• The optimized method expands the applicability of CRISPR interference technology in marine bacteria.