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The eye in the partial trisomy 2q syndrome
American Journal of Ophthalmology
|August 1, 1977
Summary
Partial trisomy of chromosome 2 long arm caused mandibulofacial dysostosis and other malformations in a family. Unbalanced translocations in males led to severe ocular issues, indicating an inherited syndrome.
Area of Science:
- Genetics
- Ophthalmology
- Clinical Dysmorphology
Background:
- A family presented with a genetic disorder characterized by mandibulofacial dysostosis, mental retardation, and skeletal, genital, and ocular malformations.
- The condition was associated with partial trisomy of the long arm of chromosome 2, involving translocations with chromosome 9.
Observation:
- Female carriers exhibited balanced translocations, while males showed unbalanced translocations.
- Affected males displayed a range of ocular abnormalities, including uveal coloboma, anterior chamber angle anomalies (Ringer's syndrome), congenital glaucoma with lens dislocation, exotropia, and blepharoconjunctivitis.
Findings:
- The study identified a specific pattern of malformations linked to a partial trisomy of chromosome 2 long arm.
- Chromosomal analysis revealed sex-specific differences in translocation balance, impacting phenotypic expression.
Implications:
- This case highlights the role of chromosomal abnormalities in inherited malformation syndromes.
- Understanding these genetic mechanisms is crucial for genetic counseling and diagnosis of similar conditions.