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Mitchell E, Douglas A, Kjaegaard S, Callewaert B, Vanlander A, Janssens S, Yuen AL, Skinner C, Failla P, Alberti A, Avola E, Fichera M, Kibaek M, Digilio MC, Hannibal MC, den Hollander NS, Bizzarri V, Renieri A, Mencarelli MA, Fitzgerald T, Piazzolla S, van Oudenhove E, Romano C, Schwartz C, Eichler EE, Slavotinek A, Escobar L, Rajan D, Crolla J, Carter N, Hodge JC, Mefford HC. Recurrent duplications of 17q12 associated with variable phenotypes. Am J Med Genet A 2015; 167A:3038-45. [PMID: 26420380 DOI: 10.1002/ajmg.a.37351] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Accepted: 08/06/2015] [Indexed: 02/02/2023]
Abstract
The ability to identify the clinical nature of the recurrent duplication of chromosome 17q12 has been limited by its rarity and the diverse range of phenotypes associated with this genomic change. In order to further define the clinical features of affected patients, detailed clinical information was collected in the largest series to date (30 patients and 2 of their siblings) through a multi-institutional collaborative effort. The majority of patients presented with developmental delays varying from mild to severe. Though dysmorphic features were commonly reported, patients do not have consistent and recognizable features. Cardiac, ophthalmologic, growth, behavioral, and other abnormalities were each present in a subset of patients. The newly associated features potentially resulting from 17q12 duplication include height and weight above the 95th percentile, cataracts, microphthalmia, coloboma, astigmatism, tracheomalacia, cutaneous mosaicism, pectus excavatum, scoliosis, hypermobility, hypospadias, diverticulum of Kommerell, pyloric stenosis, and pseudohypoparathryoidism. The majority of duplications were inherited with some carrier parents reporting learning disabilities or microcephaly. We identified additional, potentially contributory copy number changes in a subset of patients, including one patient each with 16p11.2 deletion and 15q13.3 deletion. Our data further define and expand the clinical spectrum associated with duplications of 17q12 and provide support for the role of genomic modifiers contributing to phenotypic variability.
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Affiliation(s)
- Elyse Mitchell
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Andrew Douglas
- Princess Anne Hospital, Wessex Clinical Genetics Service, Southhampton, United Kingdom
| | - Susanne Kjaegaard
- Department of Clinical Genetics, Rigshospitalet, University Hospital of Copenhagen, Copenhagen, Denmark
| | - Bert Callewaert
- Center for Medical Genetics, Ghent University, Ghent, Belgium
| | | | - Sandra Janssens
- Center for Medical Genetics, Ghent University, Ghent, Belgium
| | - Amy Lawson Yuen
- Multicare Health System, Genomics Institute, Tacoma, Washington
| | - Cindy Skinner
- J.C. Self Research Institute, Greenwood Genetic Center, Greenwood, South Carolina
| | | | | | | | - Marco Fichera
- IRCCS Associazione Oasi Maria Santissima, Troina, Italy.,Medical Genetics, University of Catania, Catania, Italy
| | | | - Maria C Digilio
- Department of Medical Genetics, Bambino Gesù Pediatric Hospital, IRCCS, Rome, Italy
| | - Mark C Hannibal
- Division of Pediatric Genetics, Metabolism and Genomic Medicine, University of Michigan Medical School, Ann Arbor, Michigan
| | | | | | | | | | - Tomas Fitzgerald
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom
| | - Serena Piazzolla
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom
| | | | | | - Charles Schwartz
- J.C. Self Research Institute, Greenwood Genetic Center, Greenwood, South Carolina
| | - Evan E Eichler
- Department of Genome Sciences and Howard Hughes Medical Institute, University of Washington, Seattle, Washington
| | - Anne Slavotinek
- Department of Pediatrics, University of California, San Francisco, California
| | - Luis Escobar
- Payton Manning Children's Hospital, Indianapolis, Indiana
| | - Diana Rajan
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom
| | - John Crolla
- Wessex Regional Genetics Laboratory, Salisbury District Hospital, Salisbury, United Kingdom
| | - Nigel Carter
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom
| | - Jennelle C Hodge
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota.,Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, California
| | - Heather C Mefford
- Division of Genetic Medicine, Department of Pediatrics, University of Washington and Seattle Children's Hospital, Seattle, Washington
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