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Distal 8p deletion (8p23.1----8pter): a common deletion?
R Hutchinson1, M Wilson, L Voullaire
1Victorian Clinical Genetics Services, Murdoch Institute, Royal Children's Hospital, Parkville, Australia.
Journal of Medical Genetics
|June 1, 1992
Summary
This study details five patients with chromosome 8 short arm deletion (del(8)(p23)), finding frequent congenital heart defects and mild intellectual disability. These cases suggest del(8)(p23) may be more common than previously thought.
Area of Science:
- Genetics
- Clinical Genetics
- Cytogenetics
Background:
- Chromosome 8p deletions are rare genetic disorders.
- Understanding the spectrum of clinical features associated with specific deletions is crucial for diagnosis and management.
Observation:
- Five new cases of de novo deletion of the short arm of chromosome 8 at band p23 (del(8)(p23)) were identified.
- Clinical manifestations included mild mental retardation, subtle facial anomalies, and cardiac abnormalities in a significant proportion of patients.
- Comparison with previously reported cases of del(8)(p23) and 8p- syndrome (associated with del(8)(p21)) was performed.
Findings:
- Small, distal 8p deletions (del(8)(p23)) are associated with a notable frequency of major congenital anomalies, particularly congenital heart defects.
- Facial dysmorphism may be subtle, and intellectual disability less severe compared to deletions with more proximal breakpoints.
- The detection of five patients within a four-year period suggests this deletion syndrome might be relatively frequent.
Implications:
- This research highlights the importance of recognizing del(8)(p23) as a distinct clinical entity with specific phenotypic characteristics.
- Early identification and genetic counseling are vital for families affected by this deletion syndrome.
- Further research into the mechanisms of terminal deletion formation is warranted.