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Goldlust IS, Hermetz KE, Catalano LM, Barfield RT, Cozad R, Wynn G, Ozdemir AC, Conneely KN, Mulle JG, Dharamrup S, Hegde MR, Kim KH, Angle B, Colley A, Webb AE, Thorland EC, Ellison JW, Rosenfeld JA, Ballif BC, Shaffer LG, Demmer LA, Rudd MK. Mouse model implicates GNB3 duplication in a childhood obesity syndrome. Proc Natl Acad Sci U S A 2013; 110:14990-4. [PMID: 23980137 PMCID: PMC3773733 DOI: 10.1073/pnas.1305999110] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Obesity is a highly heritable condition and a risk factor for other diseases, including type 2 diabetes, cardiovascular disease, hypertension, and cancer. Recently, genomic copy number variation (CNV) has been implicated in cases of early onset obesity that may be comorbid with intellectual disability. Here, we describe a recurrent CNV that causes a syndrome associated with intellectual disability, seizures, macrocephaly, and obesity. This unbalanced chromosome translocation leads to duplication of over 100 genes on chromosome 12, including the obesity candidate gene G protein β3 (GNB3). We generated a transgenic mouse model that carries an extra copy of GNB3, weighs significantly more than its wild-type littermates, and has excess intraabdominal fat accumulation. GNB3 is highly expressed in the brain, consistent with G-protein signaling involved in satiety and/or metabolism. These functional data connect GNB3 duplication and overexpression to elevated body mass index and provide evidence for a genetic syndrome caused by a recurrent CNV.
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Affiliation(s)
- Ian S. Goldlust
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322
| | - Karen E. Hermetz
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322
| | - Lisa M. Catalano
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322
| | | | - Rebecca Cozad
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322
| | - Grace Wynn
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322
| | - Alev Cagla Ozdemir
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322
| | - Karen N. Conneely
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322
- Departments of Biostatistics and Bioinformatics and
| | - Jennifer G. Mulle
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322
- Epidemiology, Emory University School of Public Health, Atlanta, GA 30322
| | - Shikha Dharamrup
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322
| | - Madhuri R. Hegde
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322
| | - Katherine H. Kim
- Division of Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL 60614
| | - Brad Angle
- Division of Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL 60614
| | - Alison Colley
- Department of Clinical Genetics, South Western Sydney Local Health District, Liverpool, NSW 1871, Australia
| | - Amy E. Webb
- Amy E. Webb Pediatrics, Pismo Beach, CA 93449
| | - Erik C. Thorland
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905
| | - Jay W. Ellison
- Signature Genomic Laboratories, PerkinElmer, Inc., Spokane, WA 99207
| | - Jill A. Rosenfeld
- Signature Genomic Laboratories, PerkinElmer, Inc., Spokane, WA 99207
| | - Blake C. Ballif
- Signature Genomic Laboratories, PerkinElmer, Inc., Spokane, WA 99207
| | - Lisa G. Shaffer
- Signature Genomic Laboratories, PerkinElmer, Inc., Spokane, WA 99207
| | - Laurie A. Demmer
- Division of Genetics and Metabolism, Tufts University School of Medicine, Boston, MA 02111; and
| | | | - M. Katharine Rudd
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA 30322
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Liu YH, Xie RG, Zhang XY, Wei SD, He Y, Xu WF, Lin YY, Xiong F. A new partial trisomy 12p with artery catheter vagus, congenital cataracts, external auditory canal, and no turbinate. Gene 2012; 509:164-7. [PMID: 22959136 DOI: 10.1016/j.gene.2012.07.052] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Revised: 07/25/2012] [Accepted: 07/30/2012] [Indexed: 11/16/2022]
Abstract
We describe the prenatal diagnosis and fetal phenotype of partial trisomy 12 (p12-pter) transmitted from a maternal reciprocal translocation 6;12. Genetic analysis was conducted on umbilical cord blood for a fetus accompanied with tricuspid regurgitation and orbital hypertelorism from a 27-year-old gravida 4, para 1 after sonography at gestation 35 weeks. The karyotype was unusual, with 46, XY, der (6), t (6;12) (p24; p12) mat. The pregnancy was terminated at 37 gestational weeks. The aborted fetus displayed dysmorphic features of a round flat face with prominent cheeks and high forehead, hypertelorism, short nose, broad and depressed nasal bridge, anteverted nares, deformed philtrum, open mouth, thin upper vermilion and broad everted lower lip, low-set ears and aural atresia, broad hands with simian creases, and a short neck. Fetal anatomy showed right artery catheter vagus, congenital cataract, no turbinate and external auditory canals. Through karyotype-phenotype analysis of this patient and a review of other reported cases, we believe this is a first report that expands the database of partial trisomy 12p, and is beneficial for future clinical genetic counseling. This study supports that phenotypic variability depends on the type and extent of the associated partial monosomy.
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Affiliation(s)
- Yan-Hui Liu
- Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou 510515, Guangdong, China
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Margari L, Di Cosola ML, Buttiglione M, Pansini A, Buonadonna AL, Craig F, Cariola F, Petruzzelli MG, Gentile M. Molecular cytogenetic characterization and genotype/phenotype analysis in a patient with a de novo 8p23.2p23.3 deletion/12p13.31p13.33 duplication. Am J Med Genet A 2012; 158A:1713-8. [PMID: 22639464 DOI: 10.1002/ajmg.a.35400] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Accepted: 03/12/2012] [Indexed: 11/08/2022]
Abstract
Genomic copy number imbalances are being increasingly identified as an important cause of intellectual disability (ID) and behavioral disturbances. This article reports the clinical features, and long term follow-up of a patient with neurodevelopmental, cognitive, and behavioral abnormalities associated with facial dysmorphism, CNS anomalies, and epilepsy. The karyotype was normal; array CGH testing revealed a de novo cryptic aberration with a terminal 8p23.2p23.3 deletion, and a concomitant 12p13.31p13.33 duplication, of 6.86 Mb, and 8.49 Mb, respectively. Our patient clinical features are compared to those of partial 8 monosomy and/or partial 12p trisomy cases reported in literature, in order to establish genotype-phenotype correlations. For some features, for example, electroencephalogram (EEG) abnormalities and epilepsy, both abnormalities seem to make a contribution, while most phenotypic traits have been assigned to 8p monosomy or to 12p trisomy, contributing to a tentative phenotype map for partial monosomy of the short arm of chromosome 8, and trisomy of the short arm of chromosome 12.
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Affiliation(s)
- Lucia Margari
- Department of Neurological and Psychiatric Sciences, Child and Adoloscence Neuropsychiatric Unit, University of Bari, Italy
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