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Promoter Cre-Specific Genotyping Assays for Authentication of Cre-Driver Mouse Lines
Greig Couasnay1, Christopher Frey1, Florent Elefteriou1,2
1Department of Orthopedic Surgery.
Abstract:
The Cre-LoxP system gene knockout (KO) technology provides cell- and time-specificity of gene ablation to investigate cell-autonomous gene function in vivo, and is paramount for understanding the function of genes involved in bone development, remodeling, and repair. This approach permits gene ablation in a cell- or tissue-specific, differentiation stage-specific, and inducible manner, thanks to the use of well-chosen promoters that drive expression of the Cre recombinase in selected cells/tissues. The generation of these powerful tools has led to the expansion of Cre mouse lines available to the research community, which are often shared within and between laboratories. Although convenient and commonly used, genotyping these Cre lines with a generic set of primers that amplifies the Cre transgene does not distinguish between various Cre-deleter lines. This practice poses the significant risk of mistakenly swapping Cre lineages, as laboratories often host and handle several lines at a time and utilize multiple lines per project. In line with the NIH-led effort to promote authentication of biological reagents and increase scientific rigor, we report here strategies for designing appropriate sets of primers able to discriminate some of most widely used Cre-deleter mouse lines in the field of bone biology, and the validation of 24 of them.
Insights
Generic genotyping of Cre-LoxP mouse lines risks lineage confusion. This study presents validated primer sets to accurately identify specific Cre-deleter lines, enhancing research rigor in bone biology.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- The Cre-LoxP system enables precise gene knockout (KO) for studying gene function in vivo.
- Cre recombinase expression, driven by specific promoters, allows cell-, time-, and inducible gene ablation.
- Accurate identification of Cre mouse lines is crucial for reproducible research.
Purpose of the Study:
- To develop and validate specific primer sets for distinguishing commonly used Cre-deleter mouse lines.
- To address the risk of Cre lineage misidentification in shared mouse lines.
- To improve the reliability of genetic studies in bone biology.
Main Methods:
- Design of novel primer sets targeting specific Cre-deleter transgenes.
- Validation of primer sets using PCR-based genotyping.
- Testing of 24 primer sets across various widely used Cre mouse lines.
Main Results:
- Successfully designed and validated primer sets capable of discriminating between different Cre-deleter mouse lines.
- Demonstrated the ability of the new primers to prevent misidentification of Cre lineages.
- Provided a validated resource for researchers working with multiple Cre mouse lines.
Conclusions:
- Specific genotyping strategies are essential for maintaining the integrity of Cre-LoxP based research.
- The developed primer sets enhance scientific rigor by preventing Cre lineage mix-ups.
- These validated primers support accurate genetic manipulation in bone biology studies.
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