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Foundation Sciences · Genetics
Thalassaemias
Thalassaemias are inherited disorders of globin chain synthesis, with α- or β-globin underproduction causing microcytic anaemia.
📌 Learning Objectives
- Describe the underlying mechanism of Thalassaemias.
- Identify the key clinical features and complications of Thalassaemias.
- Outline the appropriate investigations and management of Thalassaemias.
- Discuss the implications for patients and families of Thalassaemias.
📋 Overview
α-thalassaemia results from deletions of one to four α-globin genes; β-thalassaemia from point mutations in HBB. β-thalassaemia major presents in infancy with severe transfusion-dependent anaemia.
🔬 Basic Science
α-thalassaemia results from deletions of one to four α-globin genes; β-thalassaemia from point mutations in HBB. β-thalassaemia major presents in infancy with severe transfusion-dependent anaemia.
🏥 Clinical Relevance
Antenatal screening identifies carrier couples and offers prenatal diagnosis.
🧪 Investigations
Investigation depends on clinical context: relevant blood tests, imaging, and specific genetic or histopathological tests as appropriate. Refer to specialist services where indicated.
💊 Management
Management is condition-specific and typically multidisciplinary, combining medical therapy, surgical intervention where appropriate, supportive care, and family/genetic counselling.
Revision Resources – expand the sections below for high-yield notes, exam pearls, key facts and further reading.
MLA High-Yield Notes & Quick Revision ⌄
Common SBA themes: recognising the underlying mechanism, identifying classic clinical features, and choosing the first-line investigation or management step. Watch for inheritance pattern and characteristic associations.
thalassaemia
alpha thalassaemia
beta thalassaemia
chelation
- α-thalassaemia involves deletions of the α-globin genes on chromosome 16.
- β-thalassaemia involves point mutations in HBB on chromosome 11.
- β-thalassaemia major causes severe transfusion-dependent anaemia from ~6 months.
- Iron chelation prevents cardiac and endocrine complications of transfusion overload.
- Bone marrow transplantation can be curative in selected patients.
Exam Pearls ⌄
⭐ High Yield
α-thalassaemia involves deletions of the α-globin genes on chromosome 16.
β-thalassaemia involves point mutations in HBB on chromosome 11.
β-thalassaemia major causes severe transfusion-dependent anaemia from ~6 months.
Iron chelation prevents cardiac and endocrine complications of transfusion overload.
Bone marrow transplantation can be curative in selected patients.
💡 Clinical Pearl
Thalassaemia: Antenatal screening identifies carrier couples and offers prenatal diagnosis.
⚠️ Exam Tip — Common Mistakes
Confusing the mechanism of Thalassaemias with related conditions.
Missing classic clinical features of Thalassaemias in SBA stems.
Failing to consider Thalassaemias in the differential diagnosis.
Key Facts ⌄
α-thalassaemia involves deletions of the α-globin genes on chromosome 16.
β-thalassaemia involves point mutations in HBB on chromosome 11.
β-thalassaemia major causes severe transfusion-dependent anaemia from ~6 months.
Iron chelation prevents cardiac and endocrine complications of transfusion overload.
Bone marrow transplantation can be curative in selected patients.
Related Topics ⌄
References ⌄
- GMC MLA Content Map
- NICE Clinical Knowledge Summaries
- BMJ Best Practice
Further Resources
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