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A 13-year-old boy with cognitive impairment, retinoblastoma, and Wilson disease
D Riley1, M Wiznitzer, S Schwartz
1Department of Neurology, University Hospitals of Cleveland and Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA. David.Riley@uhhs.com
Insights
This study reports a rare co-occurrence of retinoblastoma and Wilson disease in a child with developmental delay. A deletion on chromosome 13 likely contributed to both genetic conditions.
Area of Science:
- Genetics
- Pediatrics
- Oncology
Background:
- Developmental delay can be associated with complex genetic conditions.
- Retinoblastoma is a pediatric eye cancer, while Wilson disease is a genetic liver and brain disorder.
Observation:
- A 4-year-old child with developmental delay was diagnosed with retinoblastoma.
- At age 11, the same child was diagnosed with Wilson disease.
- This dual diagnosis is previously unreported in medical literature.
Findings:
- Cytogenetic and molecular analyses revealed an interstitial deletion on chromosome 13 (13q14.2-13q22.2).
- This deletion encompasses the genetic loci for both retinoblastoma and Wilson disease.
- The co-occurrence is postulated to result from a combination of hemizygosity, an inherited Wilson disease mutation, and an acquired retinoblastoma mutation.
Implications:
- This case highlights a potential genetic link between retinoblastoma and Wilson disease.
- Understanding such associations can improve diagnostic strategies for children with developmental delay.
- Further research into chromosome 13 deletions may reveal new insights into rare disease co-occurrences.
Abstract:
A developmentally delayed child manifested retinoblastoma at age 4 years and Wilson disease at age 11, a previously unreported association. Cytogenetic and molecular analysis showed an interstitial deletion in the long arm of the paternally derived homologue of chromosome 13 (13q14.2-13q22.2), which encompasses the retinoblastoma and Wilson disease loci. The authors postulate that the co-occurrence of retinoblastoma and Wilson disease was the consequence of an acquired somatic mutation at the retinoblastoma locus and an inherited mutation at the Wilson disease locus of the maternally derived chromosome 13, superimposed on the hemizygosity associated with the paternally derived deletion.