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Poirsier C, Landais E, Bednarek N, Nobecourt JM, Khoury M, Schmidt P, Morville P, Gruson N, Clomes S, Michel N, Riot A, Manjeongean C, Gaillard D, Doco-Fenzy M. Report on 3 patients with 12p duplication including GRIN2B. Eur J Med Genet 2014; 57:185-94. [PMID: 24503147 DOI: 10.1016/j.ejmg.2013.12.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Accepted: 12/31/2013] [Indexed: 11/19/2022]
Abstract
The duplication of the short arm (p) of chromosome 12 is a rare chromosomal abnormality, and most reported cases result from malsegregation of a balanced parental translocation associated with other chromosomal imbalances. Of the reported cases, only 15 involve a pure and complete 12p duplication and only 10 involve a pure and partial duplication overlapping the 12p12.3p13.1 region, including a single instance of an inherited duplication in two related individuals. Here, we report three new patients with a pure 12p duplication, detected by conventional cytogenetic studies and characterized by array-comparative genomic hybridization (array-CGH) and fluorescence in situ hybridization (FISH). The first patient was a child carrying a de novo inverted duplication of the short arm of chromosome 12. His phenotype was similar to that of the "trisomy 12p syndrome", characterized by developmental delays and craniofacial abnormalities including a high forehead, a short nose with anteverted nostrils and an everted lower lip. The second and third patients were a mother and son with a direct 12p12.3p13.1 duplication, exhibiting a milder phenotype characterized by moderate developmental delays, dysmorphic facial features, behavioral problems and obesity. The present data, including the rarity of the familial cases, should contribute to our knowledge of the genotype/phenotype correlation in trisomy 12p patients.
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Affiliation(s)
- Celine Poirsier
- Department of Genetics, Robert Debre University Hospital, Reims, France.
| | - Emilie Landais
- Department of Genetics, Robert Debre University Hospital, Reims, France
| | - Nathalie Bednarek
- Department of Pediatrics, Robert Debre University Hospital, Reims, France
| | | | - Maroun Khoury
- Department of Pediatrics, Laon Hospital, Laon, France
| | | | - Patrice Morville
- Department of Pediatrics, Robert Debre University Hospital, Reims, France
| | - Nadine Gruson
- Department of Genetics, Robert Debre University Hospital, Reims, France
| | - Sandrine Clomes
- Department of Genetics, Robert Debre University Hospital, Reims, France
| | - Nicole Michel
- Department of Genetics, Robert Debre University Hospital, Reims, France
| | - Anita Riot
- Department of Genetics, Robert Debre University Hospital, Reims, France
| | | | | | - Martine Doco-Fenzy
- Department of Genetics, Robert Debre University Hospital, Reims, France; EA3801, URCA, Reims, France
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Izumi K, Conlin LK, Berrodin D, Fincher C, Wilkens A, Haldeman-Englert C, Saitta SC, Zackai EH, Spinner NB, Krantz ID. Duplication 12p and Pallister-Killian syndrome: A case report and review of the literature toward defining a Pallister-Killian syndrome minimal critical region. Am J Med Genet A 2012; 158A:3033-45. [DOI: 10.1002/ajmg.a.35500] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Accepted: 04/21/2012] [Indexed: 11/10/2022]
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Guanciali-Franchi P, Calabrese G, Morizio E, Fantasia D, Colosimo A, Rinaldi MM, Cristini L, Simonelli A, Lonardo F, Turci A, Zatterale A, Laganà C, Stuppia L, Sabatino G, Palka G. Identification of 14 rare marker chromosomes and derivatives by spectral karyotyping in prenatal and postnatal diagnosis. Am J Med Genet A 2004; 127A:144-8. [PMID: 15108201 DOI: 10.1002/ajmg.a.20691] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Extra structurally abnormal chromosomes (ESACs) and cryptic rearrangements are often associated with mental retardation and phenotypic abnormalities. In some cases their characterisation, using standard cytogenetic techniques and fluorescence in situ hybridization (FISH), is difficult and time consuming, where a fast and accurate identification is essential, especially when such chromosomal aberrations are found in prenatal diagnosis. A recent molecular technique, spectral karyotyping (SKY), based on the spectral signature of 24 chromosome-specific painting probes labelled with different combinations of five fluorochromes, allows the simultaneous visualisation of all human chromosomes in different colours. We used SKY analysis on 14 cases with rare ESACs or cryptic unbalanced rearrangements found at pre- or postnatal diagnosis. SKY analysis permitted the classification of chromosome rearrangements in all 14 cases analysed in combination with FISH analysis.
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Affiliation(s)
- Paolo Guanciali-Franchi
- Dipartimento di Scienze Biomediche/Sez. di Genetica Medica, Università di Chieti, 66100 Chieti, Italy.
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