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Ring chromosome 8 syndrome: further characterization.
V S Tonk1, M K Kukolich, D Morgan
1Department of Pediatrics and Pathology, Texas Tech University Health Science Center, Lubbock, Texas, USA.
American Journal of Medical Genetics
|December 23, 1999
Summary
This study details two new cases of extra ring chromosome 8 (r(8)) in children. The findings better document the r(8) syndrome phenotype, ranging from mild anomalies to significant developmental delays.
Area of Science:
- Genetics
- Cytogenetics
- Human Genetics
Background:
- Extra ring chromosome 8 (r(8)) is a rare chromosomal abnormality.
- Understanding the phenotypic spectrum of r(8) is crucial for diagnosis and management.
Observation:
- Two de novo cases of r(8) were identified and confirmed using fluorescent in situ hybridization (FISH).
- Phenotypic features in 10 documented cases ranged from minor anomalies to significant growth and mental retardation.
Findings:
- The study expands the documented phenotype of extra r(8), showing a spectrum from near-normal development to severe intellectual disability.
- Mosaicism for r(8) can present with variable expressivity, overlapping with mosaic +8 syndrome.
Implications:
- Accurate diagnosis of r(8) via FISH is essential for genetic counseling.
- Further research into the molecular mechanisms underlying r(8) phenotypes is warranted.