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Gunther K, Mowrey K, Farach LS. Two new reported cases of 16q22.3q23.3 duplication syndrome highlight intrafamilial variability and potential sex expression differences within a rare duplication syndrome. Clin Case Rep 2021; 9:1629-1633. [PMID: 33768904 PMCID: PMC7981733 DOI: 10.1002/ccr3.3862] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 09/16/2020] [Accepted: 09/20/2020] [Indexed: 11/10/2022] Open
Abstract
Two new cases of 16q22.3q23.3 Duplication syndrome demonstrate that phenotype can vary from severely affected to mild psychiatric concerns, even within the same family and identical duplications.
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Affiliation(s)
- Kathryn Gunther
- Department of PediatricsDivision of Medical GeneticsMcGovern Medical SchoolUniversity of Texas Health Science Center at HoustonHoustonTXUSA
| | - Kate Mowrey
- Department of PediatricsDivision of Medical GeneticsMcGovern Medical SchoolUniversity of Texas Health Science Center at HoustonHoustonTXUSA
| | - Laura Schoch Farach
- Department of PediatricsDivision of Medical GeneticsMcGovern Medical SchoolUniversity of Texas Health Science Center at HoustonHoustonTXUSA
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Nguyen HH, Pham VA, Barcia G, Malan V, Nguyen KLT, Ngo DN, Nguyen TH, Landrieu P, Colleaux L, Nong VH, Nguyen LS. Distal duplication of chromosome 16q22.1q23.1 in a Vietnamese patient with midface hypoplasia and intellectual disability. Am J Med Genet A 2018; 176:1981-1984. [PMID: 30178921 DOI: 10.1002/ajmg.a.40375] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 05/04/2018] [Accepted: 06/03/2018] [Indexed: 11/11/2022]
Abstract
The clinical presentation of distal duplications of the long arm of chromosome (chr) 16 is currently not well described. Only one case of microduplication of chr16q22.1 and another involving the chr16q22.1q23.1 region have been reported so far. Here, using array comparative genomic hybridization, we identified a second case of chr16q22.1q23.1 duplication in a Vietnamese boy, who shares significant clinical phenotype with the previously described case. Aside from developmental delay, intellectual disability and midface hypoplasia, our patient also displays a forked tongue, visual impairment and external ptosis. Our report further expands the clinical spectrum associated with duplication of this region.
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Affiliation(s)
- Huy Hoang Nguyen
- Institute of Genome Research, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Van Anh Pham
- Vietnam National Hospital of Pediatrics, Hanoi, Vietnam
| | - Giulia Barcia
- Laboratory of Molecular and Pathophysiological Bases of Cognitive Disorders, Imagine Institute, Paris, France
| | - Valérie Malan
- Laboratory of Molecular and Pathophysiological Bases of Cognitive Disorders, Imagine Institute, Paris, France
| | - Kiem Lien Thi Nguyen
- Institute of Genome Research, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Diem Ngoc Ngo
- Vietnam National Hospital of Pediatrics, Hanoi, Vietnam
| | - Thu Hien Nguyen
- Institute of Genome Research, Vietnam Academy of Science and Technology, Hanoi, Vietnam.,Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Pierre Landrieu
- Laboratory of Molecular and Pathophysiological Bases of Cognitive Disorders, Imagine Institute, Paris, France
| | - Laurence Colleaux
- Laboratory of Molecular and Pathophysiological Bases of Cognitive Disorders, Imagine Institute, Paris, France.,Paris Descartes-Sorbonne Paris Cité University, Paris, France
| | - Van Hai Nong
- Institute of Genome Research, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Lam Son Nguyen
- Laboratory of Molecular and Pathophysiological Bases of Cognitive Disorders, Imagine Institute, Paris, France.,Paris Descartes-Sorbonne Paris Cité University, Paris, France
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Gillentine MA, Schaaf CP. The human clinical phenotypes of altered CHRNA7 copy number. Biochem Pharmacol 2015; 97:352-362. [PMID: 26095975 DOI: 10.1016/j.bcp.2015.06.012] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 06/10/2015] [Indexed: 01/03/2023]
Abstract
Copy number variants (CNVs) have been implicated in multiple neuropsychiatric conditions, including autism spectrum disorder (ASD), schizophrenia, and intellectual disability (ID). Chromosome 15q13 is a hotspot for such CNVs due to the presence of low copy repeat (LCR) elements, which facilitate non-allelic homologous recombination (NAHR). Several of these CNVs have been overrepresented in individuals with neuropsychiatric disorders; yet variable expressivity and incomplete penetrance are commonly seen. Dosage sensitivity of the CHRNA7 gene, which encodes for the α7 nicotinic acetylcholine receptor in the human brain, has been proposed to have a major contribution to the observed cognitive and behavioral phenotypes, as it represents the smallest region of overlap to all the 15q13.3 deletions and duplications. Individuals with zero to four copies of CHRNA7 have been reported in the literature, and represent a range of clinical severity, with deletions causing generally more severe and more highly penetrant phenotypes. Potential mechanisms to account for the variable expressivity within each group of 15q13.3 CNVs will be discussed.
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Affiliation(s)
- Madelyn A Gillentine
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, United States
| | - Christian P Schaaf
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, United States; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, United States.
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