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Published on: September 9, 2012
Thrombosis from a prothrombin mutation conveying antithrombin resistance
Yuhri Miyawaki1, Atsuo Suzuki, Junko Fujita
1Department of Pathophysiological Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan.
The New England Journal of Medicine
|June 22, 2012
Summary
A newly discovered genetic mutation, prothrombin Yukuhashi (p.Arg596Leu), causes hereditary thrombosis by conferring resistance to antithrombin, leading to impaired clot breakdown and increased clotting risk.
Area of Science:
- Genetics
- Hematology
- Molecular Biology
Background:
- Hereditary thrombosis is a significant risk factor for thromboembolic events.
- Antithrombin is a critical regulator of coagulation, inhibiting thrombin activity.
- Genetic mutations in prothrombin can lead to thrombophilia.
Observation:
- A novel prothrombin variant, termed prothrombin Yukuhashi, was identified with an arginine to leucine substitution at position 596 (p.Arg596Leu).
- This mutation resulted in moderately reduced prothrombin activity in clotting assays.
- Crucially, the formation of the thrombin-antithrombin complex was substantially impaired.
Findings:
- The p.Arg596Leu substitution leads to a gain-of-function mutation in the prothrombin gene.
- Mutant prothrombin exhibits resistance to antithrombin inactivation.
- Thrombin generation assays showed slow inactivation of the mutant prothrombin in plasma.
Implications:
- This discovery elucidates a new mechanism underlying hereditary thrombosis.
- Prothrombin resistance to antithrombin is a direct cause of increased thrombosis susceptibility.
- Understanding this mutation may inform future diagnostic and therapeutic strategies for thrombophilia.
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