Genetic background determines response to hemostasis and thrombosis

Area of Science:

• Cardiovascular Biology
• Genetics
• Hemostasis and Thrombosis

Background:

• Thrombosis is a major cause of cardiovascular disease mortality.
• C57BL/6J and A/J mice exhibit distinct differences in cardiovascular phenotypes.
• The influence of genetic background on thrombosis and hemostasis pathways is not fully understood.

Purpose of the Study:

• To investigate thrombosis and hemostasis differences between C57BL/6J and A/J mice.
• To identify genetic loci controlling these phenotypes using chromosome substitution strains.

Main Methods:

• Ferric chloride-induced carotid artery thrombosis model to measure occlusion time.
• Tail bleeding and rebleeding assays as hemostasis markers.
• Screening of 21 A/J chromosome substitution strains on a C57BL/6J background.

Main Results:

• A/J mice exhibited decreased thrombus occlusion time and increased rebleeding time compared to C57BL/6J mice.
• Tail collagen content was higher in A/J mice.
• Three chromosome substitution strains (B6-Chr5A/J, B6-Chr11A/J, B6-Chr17A/J) showed increased rebleeding, similar to A/J mice.

Conclusions:

• Genetic background significantly influences arterial thrombosis and hemostasis.
• Specific A/J chromosomes (5 and 17) contribute to increased rebleeding.
• Identifying genetic determinants of thrombotic risk is feasible through these models.