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Asymptomatic homozygous protein C deficiency.
A Tripodi1, F Franchi, A Krachmalnicoff
1A. Bianchi Bonomi Hemophilia and Thrombosis Center, University of Milan, Maggiore Hospital, Italy.
Acta Haematologica
|January 1, 1990
Summary
Homozygous protein C deficiency presents with varied clinical outcomes, even with extremely low protein C levels. Other factors likely influence the development of thrombosis in these patients.
Area of Science:
- Genetics
- Hematology
- Molecular Biology
Background:
- Protein C deficiency is a rare inherited thrombophilia.
- Homozygous protein C deficiency typically leads to severe thrombotic events.
Observation:
- Two homozygotes with very low protein C levels exhibited different clinical phenotypes.
- One individual experienced recurrent venous thrombosis, while the other remained asymptomatic.
- A review of 13 additional cases revealed variable phenotypic expression.
Findings:
- Homozygous protein C deficiency can be classified into two groups based on protein C levels and thrombotic onset.
- Very low protein C levels (<10%) are compatible with no thrombosis history in adulthood.
- Clinical penetrance of homozygous protein C deficiency is influenced by factors beyond protein C levels.
Implications:
- This variability suggests that other genetic or environmental factors modulate thrombotic risk.
- Further research is needed to identify these interacting factors.
- Understanding these modifiers is crucial for accurate risk assessment and personalized management of protein C deficiency.