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Childhood myeloproliferative disorders
1Molecular Haematology Unit, Institute of Child Health, London, UK.
Insights
Paediatric myeloproliferative disorders (MPD) and myelodysplastic syndromes (MDS) share genetic events on chromosome 7. Similar critical regions on chromosome 7 may hold genes crucial for abnormalities of increased myeloproliferation in childhood (AIMC).
Area of Science:
- Paediatric Haematology
- Cancer Genetics
- Cytogenetics
Background:
- Paediatric myeloproliferative disorders (MPD) and myelodysplastic syndromes (MDS) are characterized by abnormal myeloproliferation.
- These childhood disorders share common genetic events, particularly involving chromosome 7.
Purpose of the Study:
- To investigate the shared genetic underpinnings of abnormalities of increased myeloproliferation in childhood (AIMC).
- To identify critical regions on chromosome 7 involved in the pathogenesis of AIMC.
Main Methods:
- Comparative genomic analysis of paediatric MPD and MDS cases.
- Fluorescence in situ hybridization (FISH) to map critical regions on chromosome 7.
Main Results:
- The most frequent cytogenetic alteration observed is monosomy or deletion of the long arm of chromosome 7.
- Similar critical regions on chromosome 7 were identified in both MPD and MDS, suggesting a common pathogenic mechanism.
Conclusions:
- Abnormalities of increased myeloproliferation in childhood (AIMC) should be considered a unified group due to shared genetic events.
- Specific regions on chromosome 7 are implicated in the pathogenesis of AIMC and may harbor key genes.
Abstract:
Disorders classified as paediatric myeloproliferative disorders (MPD), such as juvenile chronic myeloid leukaemia (JCML), and as paediatric myelodysplastic syndrome (MDS), are essentially diseases characterized by abnormal myeloproliferation and they share similar genetic events on chromosome 7. As such, the abnormalities of increased myeloproliferation in childhood (AIMC) should be considered under the same heading. Constitutional and other genetic factors play an essential role in children and include the NF1 gene, whereas toxic exposure is of greater importance in adults. The most common cytogenetic alteration is that of monosomy or deletion of the long arm of chromosome 7. Critical regions have been identified and mapped by fluorescence in situ hybridization (FISH). It appears that the similar critical regions on chromosome 7 are involved, and suggests that these regions may contain genes important in the pathogenesis of AIMC.