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Myelodysplastic syndrome in a kindred with ins(16) (p11.2)
R E Clark1, D Geddes, K Whittaker
1Department of Haematology, University of Wales College of Medicine, Cardiff, U.K.
Abstract:
A constitutional karyotypic abnormality, ins(16)(p11.2), is described in a case of myelodysplastic syndrome (MDS). The source of material for this insertion could not be established, but did not arise from either a balanced deletion or translocation, and did not consist of constitutive heterochromatin as defined by C-banding. The same lesion was found in both sisters, both nephews and four of the five great-nephews. Of these, all were phenotypically and haematologically normal, with the exception of a great-nephew who at the age at the age of 6 exhibits features compatible with partial trisomy 16p. The relationship of the karyotypic abnormality to the MDS and partial trisomy 16p in this family is discussed.
Insights
A rare constitutional karyotypic abnormality, insertion (16)(p11.2), was identified in a myelodysplastic syndrome (MDS) patient and several family members. This genetic anomaly appears to be inherited, with varying clinical outcomes observed in affected relatives.
Area of Science:
- Genetics
- Hematology
- Human Biology
Background:
- Myelodysplastic syndromes (MDS) are a group of clonal hematopoietic stem cell disorders.
- Constitutional karyotypic abnormalities can predispose individuals to hematological malignancies.
- Understanding familial inheritance patterns of chromosomal aberrations is crucial for genetic counseling.
Observation:
- A novel constitutional insertion, ins(16)(p11.2), was identified in a patient diagnosed with myelodysplastic syndrome (MDS).
- The insertion's origin was unclear, not involving balanced rearrangements or constitutive heterochromatin.
- The same ins(16)(p11.2) was detected in multiple phenotypically and hematologically normal family members across generations.
Findings:
- The ins(16)(p11.2) abnormality was present in the affected MDS patient and several asymptomatic relatives, suggesting familial inheritance.
- One great-nephew with the insertion exhibited features consistent with partial trisomy 16p at age 6.
- The study discusses the potential link between the ins(16)(p11.2) and both MDS and partial trisomy 16p within this family.
Implications:
- This case highlights the complex relationship between inherited chromosomal abnormalities and the development of hematological disorders like MDS.
- The findings suggest that ins(16)(p11.2) may represent a predisposing factor for MDS or other genetic conditions in certain families.
- Further research is needed to elucidate the precise mechanisms by which ins(16)(p11.2) influences hematopoiesis and phenotype.