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Aplastic Anemia, Pediatric Aspects
1Division of Pediatric Hematology/Oncology, The University of Texas Medical Branch at Galveston, Galveston, Texas, 77555-0361, USA.
Insights
Inherited bone marrow failure syndromes (BMFs) are genetic disorders causing aplastic anemia, leukemia, and cancers. Early diagnosis and treatments like bone marrow transplantation are crucial for managing these conditions.
Area of Science:
- Hematology
- Genetics
- Oncology
Background:
- Inherited bone marrow failure syndromes (BMFs) account for a significant portion of aplastic anemia cases in children and adults.
- Fanconi's anemia (FA) is the most common BMF, characterized by DNA repair defects, birth defects, and increased cancer risk.
- Other BMFs include Dyskeratosis congenita (DC), Shwachman-Diamond syndrome, amegakaryocytic thrombocytopenia, Diamond-Blackfan anemia (DBA), and Kostmann's syndrome (KS).
Purpose of the Study:
- To review the spectrum of inherited bone marrow failure syndromes.
- To highlight the clinical manifestations, genetic basis, and management strategies for various BMFs.
- To emphasize the association between BMFs and an increased risk of malignancy.
Main Methods:
- Review of existing literature on inherited bone marrow failure syndromes.
- Summarization of key features, diagnostic criteria, and treatment options for common BMFs.
- Discussion of genetic underpinnings and emerging therapies such as gene therapy.
Main Results:
- BMFs present with diverse combinations of marrow failure, cytopenias, and premalignant conditions.
- Fanconi's anemia, Dyskeratosis congenita, and Shwachman-Diamond syndrome are associated with a high risk of leukemia and other cancers.
- Specific genetic defects have been identified for several BMFs, enabling carrier identification and potential gene therapy approaches.
Conclusions:
- Inherited bone marrow failure syndromes represent a heterogeneous group of genetic disorders with significant clinical implications, including hematologic abnormalities and increased cancer predisposition.
- Advances in genetic understanding are paving the way for improved diagnostics, carrier screening, and novel therapeutic interventions, including gene therapy.
- Bone marrow transplantation, androgens, and hematopoietic growth factors remain cornerstone treatments for managing BMFs and their complications.
Abstract:
Inherited bone marrow failure syndromes (BMFs) comprise at least one-fourth of children with aplastic anemia, and perhaps up to 10% of adults. The most common syndrome is Fanconi's anemia (FA), with more than 1,000 reported cases. FA is autosomal recessive, with birth defects in approximately 75% of patients. It is a DNA repair syndrome, diagnosed by finding chromosomal aberrations in cells treated with clastogenic agents. The major problems in FA are, in order, aplastic anemia, leukemia, and other cancers. There are at least five complementation groups; the gene for Group C has been cloned. Carrier identification and gene therapy are beginning in families at risk for FAC mutations. Dyskeratosis congenita (DC) is primarily X-linked (at Xq28), with autosomal recessive and dominant cases as well. Patients classically have reticulated hyperpigmented skin, dystrophic nails, and mucous membrane leukoplakia. approximately 50% develop aplastic anemia, sometimes prior to the DC phenotype, and approximately 10% develop cancer. Shwachman-Diamond syndrome consists of exocrine pancreatic insufficiency with neutropenia; approximately 25% develop aplastic anemia and 5%-10% develop leukemia. Amegakaryocytic thrombocytopenia presents in infancy, and often evolves into aplastic anemia and/or leukemia. Single cytopenias include Diamond-Blackfan anemia (DBA), which is inherited pure red cell aplasia; transient erythroblastopenia of childhood; Kostmann's syndrome (KS) or infantile genetic agranulocytosis, and thrombocytopenia with absent radii in which there is neonatal thrombocytopenia and absent radii. DBA and KS, particularly the latter treated with G-CSF, may develop leukemia, and solid tumors have been reported in DBA. Treatment for the various BMFs includes bone marrow transplantation, androgens, and hematopoietic cytokines such as G-CSF. These inherited syndromes thus include various combinations of marrow failure and premalignancy.