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Hypofibrinogenemia in an individual with 2 coding (gamma82 A-->G and Bbeta235 P-->L) and 2 noncoding mutations
S O Brennan1, A P Fellowes, J M Faed
1Molecular Pathology Laboratory, Canterbury Health Laboratories, Christchurch Hospital, Christchurch, New Zealand. steve.brennan@chmeds.ac.nz
Blood
|February 26, 2000
Summary
A novel gamma82 mutation was identified as the cause of hypofibrinogenemia in a patient with normal thrombin clotting time. This genetic finding provides insight into fibrinogen regulation and related bleeding disorders.
Area of Science:
- Hematology
- Molecular Genetics
- Biochemistry
Background:
- Hypofibrinogenemia, characterized by low fibrinogen levels, can lead to bleeding disorders.
- Investigating the molecular underpinnings of hypofibrinogenemia is crucial for understanding fibrinogen regulation.
Observation:
- A patient presented with hypofibrinogenemia despite a normal thrombin clotting time.
- Analysis revealed heterozygosity for a novel Bbeta235 P-->L mutation and a novel gamma(D) chain.
- Mass spectrometry showed a decreased mass of the gamma(D) chain, linked to a gamma82 A-->G substitution.
Findings:
- The gamma82 mutation, unique to the patient, was identified as the cause of hypofibrinogenemia.
- Common Bbeta mutations were found at polymorphic levels in controls, ruling them out as the cause.
- The gamma82 mutation's location in the triple helix may disrupt fibrinogen structure and reduce concentration.
Implications:
- This study elucidates a novel genetic cause of hypofibrinogenemia.
- Understanding the role of the gamma82 mutation provides insights into fibrinogen structure-function relationships.
- Findings contribute to the diagnosis and potential management of inherited bleeding disorders.
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