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El Amrani Z, Elalaoui SC, Jdioui W, Sbiti A, Ratbi I, Liehr T, Sefiani A, Natiq A. Complex translocation leading to13q interstitial deletion in a Moroccan child with retinoblastoma and intellectual disability. Ophthalmic Genet 2022; 43:689-692. [PMID: 35658784 DOI: 10.1080/13816810.2022.2083183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
BACKGROUND Retinoblastoma (RB) is the most common malignant intraocular tumor in children; it affects their eyes often even prenatally. RB may be sporadic or familial, due to germinal mutation in RB1 gene or by abnormal chromosomal abnormalities involving RB1 gene, located in 13q14. Monosomy of subband 13q14 as a partial deletion can also be responsible for RB with additional symptoms. The latter may be RB associated with psychomotor retardation, macrocephaly, broad forehead, thick earlobes, and bulbous nose. MATERIALS AND METHODS We present here the case of a boy from a consanguineous marriage with bilateral retinoblastoma, intellectual disability and facial dysmorphic features. Classical and molecular cytogenetics were used to recognize genotype-phenotype association. RESULTS The karyotype showed a three way translocation involving chromosomes 5, 12 and 13. Further molecular cytogenetics analysis revealed a deletion of 13q14 involving the tumor suppressor gene RB1. CONCLUSION This case highlights the impact of classical and molecular cytogenetics in diagnosis of rare genetic syndromes and for the genetic counselling of patients and their families. Pure molecular karyotyping analyses would miss the underlying chromosomal mechanism leading to the rearrangement.
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Affiliation(s)
- Zhour El Amrani
- RABAT Research team in genomics and molecular epidemiology of genetic diseases, Genomics Center of Human Pathologies, Faculty of Medicine and Pharmacy, University Mohammed V, Rabat, Morocco.,Département de Génétique Médicale, Institut National d'Hygiène, Rabat, Morocco
| | - Siham Chafai Elalaoui
- RABAT Research team in genomics and molecular epidemiology of genetic diseases, Genomics Center of Human Pathologies, Faculty of Medicine and Pharmacy, University Mohammed V, Rabat, Morocco.,Département de Génétique Médicale, Institut National d'Hygiène, Rabat, Morocco
| | - Wafae Jdioui
- médicale, Centre des consultations et des explorations externes, Hopital d'enfants, CHU Ibn SinaConsultation de génétique, Rabat, Marocco
| | - Aziza Sbiti
- RABAT Research team in genomics and molecular epidemiology of genetic diseases, Genomics Center of Human Pathologies, Faculty of Medicine and Pharmacy, University Mohammed V, Rabat, Morocco.,Département de Génétique Médicale, Institut National d'Hygiène, Rabat, Morocco
| | - Ilham Ratbi
- RABAT Research team in genomics and molecular epidemiology of genetic diseases, Genomics Center of Human Pathologies, Faculty of Medicine and Pharmacy, University Mohammed V, Rabat, Morocco.,Département de Génétique Médicale, Institut National d'Hygiène, Rabat, Morocco
| | - Thomas Liehr
- Institute of Human Genetics, Jena University Hospital, Friedrich Schiller University, Jena, Germany
| | - Abdelaziz Sefiani
- RABAT Research team in genomics and molecular epidemiology of genetic diseases, Genomics Center of Human Pathologies, Faculty of Medicine and Pharmacy, University Mohammed V, Rabat, Morocco.,Département de Génétique Médicale, Institut National d'Hygiène, Rabat, Morocco
| | - Abdelhafid Natiq
- RABAT Research team in genomics and molecular epidemiology of genetic diseases, Genomics Center of Human Pathologies, Faculty of Medicine and Pharmacy, University Mohammed V, Rabat, Morocco.,Département de Génétique Médicale, Institut National d'Hygiène, Rabat, Morocco
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