Temporal Cre-mediated recombination exclusively in endothelial cells using Tie2 regulatory elements

Area of Science:

• Molecular Biology
• Genetics
• Developmental Biology

Background:

• The Cre/LoxP recombination system is a powerful tool in genetics.
• Tissue-specific Cre transgenic mouse lines are essential for studying gene function in specific cell types.
• A need exists for inducible systems allowing temporal control of gene manipulation.

Purpose of the Study:

• To generate and characterize a novel inducible Cre transgenic mouse line targeting endothelial cells.
• To enable temporal and tissue-specific gene manipulation in the endothelium.
• To provide a valuable tool for studying endothelial biology in adult mice.

Main Methods:

• Generation of a Tie2Cre transgenic mouse line.
• Fusion of Cre recombinase with a mutated estrogen receptor (ER(T2)) for inducible activity.
• Administration of tamoxifen (estrogen antagonist) orally for 5 weeks to induce recombination.
• Utilized an EGFP reporter mouse line to monitor recombination efficiency.

Main Results:

• Achieved highly efficient gene recombination exclusively in endothelial cells.
• Demonstrated temporal control of recombination using tamoxifen induction.
• Confirmed no recombination in uninduced control mice, indicating high specificity.
• Validated the system's efficacy across various endothelial cell populations.

Conclusions:

• The inducible Tie2Cre mouse line offers precise temporal and spatial control of gene targeting in endothelial cells.
• This model is highly beneficial for investigating the roles of endothelial-specific genes in adult mice.
• The system allows for efficient induction of transgenes within the endothelium.