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Multiple small accessory marker chromosomes from different centromeric origin in a moderately mentally retarded male
J R Vermeesch1, H Duhamel, P Petit
1Center for Human Genetics, Campus Gasthuisberg, University of Leuven, Belgium.
Human Genetics
|January 27, 2000
Summary
Multiple small accessory chromosomes (SACs) are rare. This study details six ring-shaped SACs in a male, revealing their active centromeres and potential origins, offering insights into genetic anomalies.
Area of Science:
- Cytogenetics
- Human Genetics
- Molecular Biology
Background:
- Small accessory chromosomes (SACs) are rare chromosomal abnormalities.
- The presence of multiple SACs in an individual is exceptionally uncommon.
Observation:
- Six SACs were identified in cells from two tissues of a male with moderate intellectual disability.
- Microdissection and fluorescence in situ hybridization (FISH) revealed these SACs are ring chromosomes.
Findings:
- The SACs originated from the centromeres of different chromosomes.
- Immunofluorescence confirmed the presence of active centromeres on the SACs, indicated by anti-CENP-C antibody binding.
- SACs showed frequent association with the centromeres of other chromosomes.
Implications:
- Understanding the origin and behavior of these rare ring chromosomes is crucial.
- This case provides insights into the clinical relevance of multiple SACs and their potential impact on development.