Protocol to Design, Clone, and Validate sgRNAs for In Vivo Reverse Genetic Studies

Area of Science:

• Neuroscience
• Molecular Biology
• Gene Editing

Background:

• Adeno-associated virus (AAV) mediated CRISPR/Cas9 allows for gene mutagenesis in the adult central nervous system (CNS).
• Existing methods for determining in vivo on-target mutagenesis are limited by the difficulty of isolating virally transduced cells.

Purpose of the Study:

• To optimize a workflow for the design, cloning, and validation of single-guide RNAs (sgRNAs) delivered by AAVs in vivo.
• To provide a versatile protocol applicable to any target gene in the CNS of rat or mouse models.

Main Methods:

• Development of a protocol for AAV-CRISPR/Cas9 system delivery.
• Optimization of sgRNA design, cloning, and validation for in vivo applications.
• Adaptation of the protocol for Cre or Flp driver lines using AAV-FLEX-SaCas9-sgRNA or AAV-FLEXfrt-SaCas9-sgRNA.

Main Results:

• Successful implementation of a workflow for AAV-mediated gene mutagenesis in the adult CNS.
• Demonstration of the protocol's applicability to various target genes in rodent models.
• Validation of adaptability to conditional gene editing systems.

Conclusions:

• The optimized protocol facilitates efficient and specific in vivo gene mutagenesis in the adult CNS.
• This method overcomes previous limitations in isolating transduced cells, improving on-target mutagenesis determination.
• The protocol is adaptable for broad use in neuroscience research and genetic engineering in vivo.