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Insertions/deletions in the antithrombin gene: 3 mutations associated with non-expression
M Daly1, D J Perry, P L Harper
1Department of Haematology, MRC Centre, Cambridge, England.
Thrombosis and Haemostasis
|May 4, 1992
Summary
Three novel mutations causing antithrombin deficiency were identified in individuals with a history of blood clots. These genetic changes lead to reduced antithrombin levels, impacting protein function and potentially increasing clotting risk.
Area of Science:
- Genetics
- Molecular Biology
- Hematology
Background:
- Antithrombin deficiency is a genetic risk factor for thromboembolic disease.
- Investigating the molecular underpinnings of this deficiency is crucial for understanding disease pathogenesis.
Observation:
- Three individuals with suspected antithrombin deficiency were studied.
- Two individuals had a family history of thromboembolic events.
- Reduced functional and immunologic antithrombin levels (approx. 50%) were observed in plasma.
Findings:
- Novel single-base mutations (two insertions, one deletion) were identified in the antithrombin gene.
- These mutations (T insertion at codon 48, A insertion at codon 208, A deletion at codon 370) resulted in frameshifts.
- Mutations led to premature protein translation termination, with no detectable truncated antithrombin in plasma.
Implications:
- These findings elucidate the genetic basis of antithrombin deficiency in the studied cases.
- The lack of detectable truncated protein suggests rapid degradation or impaired secretion.
- Understanding these mutations can aid in diagnosing and managing hereditary thrombophilia.
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01:35Mutations
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