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Ader F, Heide S, Marzin P, Afenjar A, Diguet F, Chantot Bastaraud S, Rollat-Farnier PA, Sanlaville D, Portnoï MF, Siffroi JP, Schluth-Bolard C. A 14q distal chromoanagenesis elucidated by whole genome sequencing. Eur J Med Genet 2019; 63:103776. [PMID: 31562959 DOI: 10.1016/j.ejmg.2019.103776] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Revised: 02/07/2019] [Accepted: 09/22/2019] [Indexed: 11/19/2022]
Abstract
Chromoanagenesis represents an extreme form of genomic rearrangements involving multiple breaks occurring on a single or multiple chromosomes. It has been recently described in both acquired and rare constitutional genetic disorders. Constitutional chromoanagenesis events could lead to abnormal phenotypes including developmental delay and congenital anomalies, and have also been implicated in some specific syndromic disorders. We report the case of a girl presenting with growth retardation, hypotonia, microcephaly, dysmorphic features, coloboma, and hypoplastic corpus callosum. Karyotype showed a de novo structurally abnormal chromosome 14q31qter region. Molecular characterization using SNP-array revealed a complex unbalanced rearrangement in 14q31.1-q32.2, on the paternal chromosome 14, including thirteen interstitial deletions ranging from 33 kb to 1.56 Mb in size, with a total of 4.1 Mb in size, thus suggesting that a single event like chromoanagenesis occurred. To our knowledge, this is one of the first case of 14q distal deletion due to a germline chromoanagenesis. Genome sequencing allowed the characterization of 50 breakpoints, leading to interruption of 10 genes including YY1 which fit with the patient's phenotype. This precise genotyping of breaking junction allowed better definition of genotype-phenotype correlations.
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Affiliation(s)
- Flavie Ader
- Sorbonne Université, Physiopathologie des Maladies Génétiques d'Expression Pédiatrique, F-75012, Paris, France.
| | - Solveig Heide
- Sorbonne Université, Physiopathologie des Maladies Génétiques d'Expression Pédiatrique, F-75012, Paris, France
| | - Pauline Marzin
- Sorbonne Université, Physiopathologie des Maladies Génétiques d'Expression Pédiatrique, F-75012, Paris, France
| | - Alexandra Afenjar
- Unité de neuropédiatrie et pathologie du développement, GHU Paris Est - Hôpital d'Enfants Armand-Trousseau, France
| | - Flavie Diguet
- Service de Génétique, Laboratoire de Cytogénétique Constitutionnelle, Hospices Civils de Lyon, Bron, France; GENDEV Team, Neurosciences Research Center of Lyon, INSERM U1028, CNRS UMR5292, UCBL1, 69677, Bron, France
| | - Sandra Chantot Bastaraud
- Sorbonne Université, Physiopathologie des Maladies Génétiques d'Expression Pédiatrique, F-75012, Paris, France
| | - Pierre-Antoine Rollat-Farnier
- Service de Génétique, Laboratoire de Cytogénétique Constitutionnelle, Hospices Civils de Lyon, Bron, France; Cellule bioinformatique de la plateforme NGS, Hospices Civils de Lyon, Bron, France
| | - Damien Sanlaville
- Service de Génétique, Laboratoire de Cytogénétique Constitutionnelle, Hospices Civils de Lyon, Bron, France; GENDEV Team, Neurosciences Research Center of Lyon, INSERM U1028, CNRS UMR5292, UCBL1, 69677, Bron, France
| | - Marie-France Portnoï
- Sorbonne Université, Physiopathologie des Maladies Génétiques d'Expression Pédiatrique, F-75012, Paris, France
| | - Jean-Pierre Siffroi
- Sorbonne Université, Physiopathologie des Maladies Génétiques d'Expression Pédiatrique, F-75012, Paris, France
| | - Caroline Schluth-Bolard
- Service de Génétique, Laboratoire de Cytogénétique Constitutionnelle, Hospices Civils de Lyon, Bron, France; GENDEV Team, Neurosciences Research Center of Lyon, INSERM U1028, CNRS UMR5292, UCBL1, 69677, Bron, France
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