1
|
Blanluet M, Chantot-Bastaraud S, Chambon P, Cassinari K, Vera G, Goldenberg A, Keren B, Le Meur N, Hannequin D, Mace B, Siffroi JP, Frebourg T, Nicolas G, Joly-Helas G. Recurrence of an early postzygotic rescue of an inherited unbalanced translocation resulting in mosaic segmental uniparental isodisomy of chromosome 11q in siblings. Am J Med Genet A 2021; 185:3057-3061. [PMID: 34043868 DOI: 10.1002/ajmg.a.62361] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 04/10/2021] [Accepted: 04/30/2021] [Indexed: 11/08/2022]
Abstract
Balanced translocations are associated with a risk of transmission of unbalanced chromosomal rearrangements in the offspring. Such inherited chromosomal abnormalities are typically non-mosaic as they are present in the germline. We report the recurrence in two siblings of a mosaicism for a chromosomal rearrangement inherited from their asymptomatic father who carried a balanced t(2;11)(q35;q25) translocation. Both siblings exhibited a similar phenotype including intellectual disability, dysmorphic features, kyphoscoliosis, and cervical spinal stenosis. Karyotyping, fluorescence in situ hybridization and SNP array analysis of blood lymphocytes of both siblings identified two cell lines: one carrying a 2q35q37.3 duplication and a 11q25qter deletion (~90% cells), and one carrying an 11q uniparental isodisomy of maternal origin (~10% cells). We hypothesize that these mosaics were related to a postzygotic rescue mechanism which unexpectedly recurred in both siblings.
Collapse
Affiliation(s)
- Maud Blanluet
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Sandra Chantot-Bastaraud
- Department of Medical Genetics and Embryology, Armand-Trousseau Children Hospital, AP-HP, Paris, France
| | - Pascal Chambon
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Kévin Cassinari
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Gabriella Vera
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Alice Goldenberg
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Boris Keren
- Genetics Department, La Pitié-Salpêtrière Hospital, AP-HP, Paris, France
| | - Nathalie Le Meur
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Didier Hannequin
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Bertrand Mace
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Jean-Pierre Siffroi
- Department of Medical Genetics and Embryology, Armand-Trousseau Children Hospital, AP-HP, Paris, France
| | - Thierry Frebourg
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Gaël Nicolas
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| | - Géraldine Joly-Helas
- Normandie Univ, UNIROUEN, Inserm U1245, CHU Rouen, Department of Genetics and reference center for developmental disorders, FHU G4 Génomique, F-76000, Rouen, France
| |
Collapse
|