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Partial trisomy 12q: clinical and cytogenetic observations
Clinical Genetics
|August 1, 1985
Insights
A male infant with profound intellectual disability and congenital anomalies was found to have a specific chromosomal abnormality, partial trisomy 12q. This genetic condition explains his developmental challenges.
Area of Science:
- Genetics
- Human Development
- Clinical Medicine
Background:
- Genetic abnormalities are a significant cause of congenital anomalies and developmental disorders.
- Understanding specific chromosomal aberrations is crucial for diagnosing and managing rare genetic syndromes.
Observation:
- High-resolution chromosome banding identified a male infant presenting with severe intellectual disability, hypertonia, and multiple congenital anomalies.
- The infant's karyotype was determined to be 46,XY,-der(2),t(2;12)(q37.3;q24.13)pat, indicating a translocation involving chromosomes 2 and 12.
Findings:
- The observed clinical phenotype closely matched previously documented cases of partial trisomy 12q.
- The genetic findings provide a clear etiological basis for the infant's complex medical presentation.
Implications:
- This case highlights the importance of detailed cytogenetic analysis in diagnosing complex congenital disorders.
- The observation that some clinical features may diminish with age suggests potential for developmental plasticity or varying expressivity in partial trisomy 12q.
Abstract:
High resolution chromosome banding showed a male infant with profound mental retardation, hypertonia and multiple congenital anomalies to have the karyotype 46,XY,-der (2),t(2;12)(q37.3;q24.13)pat. Most of the clinical findings were compatible with those of the previously described cases with partial trisomy 12q. Some of the clinical features seem to disappear with increasing age.