Pronuclear injection-based mouse targeted transgenesis for reproducible and highly efficient transgene expression.

Area of Science:

• Genetics
• Molecular Biology
• Animal Models

Background:

• Transgenic mice are essential for studying gene function and human diseases.
• Conventional methods often result in unpredictable and unstable transgene expression.

Purpose of the Study:

• To develop a novel pronuclear injection-based targeted transgenesis (PITT) system for generating transgenic mice.
• To improve the efficiency, stability, and reproducibility of transgene expression.
• To enable both gain-of-function and loss-of-function studies.

Main Methods:

• Developed a site-specific integration system using pronuclear injection in fertilized mouse eggs.
• Applied the PITT system to two distinct genomic target loci.
• Generated transgenic lines, including fluorescent reporter mice.
• Utilized the system for generating knockdown mice.

Main Results:

• Achieved reproducible, strong, ubiquitous, and stable transgene expression in generated lines.
• Successfully generated fluorescent mice with predictable expression patterns.
• Demonstrated the feasibility of generating knockdown mice using the PITT system.
• The PITT system circumvents issues associated with random integration methods.

Conclusions:

• The PITT system offers a more reliable and efficient method for creating transgenic mice.
• This technology reduces the time, cost, and effort required for generating genetically modified mouse models.
• PITT is a versatile tool applicable to both gain-of-function and loss-of-function in vivo studies.