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De novo trisomy 16p
J L Carrasco Juan1, J C Cigudosa, A Otero Gómez
1Cytogenetics Service, Faculty of Medicine, University of La Laguna, Tenerife, Canary Islands, Spain.
American Journal of Medical Genetics
|January 20, 1997
Summary
A rare genetic condition involving a duplication on chromosome 16p (16p duplication) caused developmental delays and distinct malformations in a male infant. This de novo genetic alteration was identified through advanced cytogenetic analysis.
Area of Science:
- Genetics
- Developmental Biology
- Clinical Medicine
Background:
- Genetic duplications can lead to complex congenital anomalies.
- Accurate cytogenetic diagnosis is crucial for understanding developmental disorders.
Observation:
- A patient presented with psychomotor retardation, single umbilical artery, craniofacial anomalies, truncal hypotonia, and lower-limb hyporreflexia.
- G-banding revealed an extra chromosome segment (16p+).
Findings:
- Fluorescent in situ hybridization (FISH) confirmed the extra material originated from chromosome 16.
- High-resolution G-banding identified a de novo tandem duplication on the 16p arm.
- The specific cytogenetic diagnosis was 46,XY,dir dup(16)(p11.2-->p12).
Implications:
- This case highlights the phenotypic variability associated with 16p duplications.
- Understanding such de novo genetic events aids in diagnosing and counseling families with developmental abnormalities.
- Further research into 16p duplication syndromes can improve genotype-phenotype correlations.