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  • 1
    Publication Date: 2011-09-02
    Description: Both obesity and being underweight have been associated with increased mortality. Underweight, defined as a body mass index (BMI) 〈/= 18.5 kg per m(2) in adults and 〈/= -2 standard deviations from the mean in children, is the main sign of a series of heterogeneous clinical conditions including failure to thrive, feeding and eating disorder and/or anorexia nervosa. In contrast to obesity, few genetic variants underlying these clinical conditions have been reported. We previously showed that hemizygosity of a approximately 600-kilobase (kb) region on the short arm of chromosome 16 causes a highly penetrant form of obesity that is often associated with hyperphagia and intellectual disabilities. Here we show that the corresponding reciprocal duplication is associated with being underweight. We identified 138 duplication carriers (including 132 novel cases and 108 unrelated carriers) from individuals clinically referred for developmental or intellectual disabilities (DD/ID) or psychiatric disorders, or recruited from population-based cohorts. These carriers show significantly reduced postnatal weight and BMI. Half of the boys younger than five years are underweight with a probable diagnosis of failure to thrive, whereas adult duplication carriers have an 8.3-fold increased risk of being clinically underweight. We observe a trend towards increased severity in males, as well as a depletion of male carriers among non-medically ascertained cases. These features are associated with an unusually high frequency of selective and restrictive eating behaviours and a significant reduction in head circumference. Each of the observed phenotypes is the converse of one reported in carriers of deletions at this locus. The phenotypes correlate with changes in transcript levels for genes mapping within the duplication but not in flanking regions. The reciprocal impact of these 16p11.2 copy-number variants indicates that severe obesity and being underweight could have mirror aetiologies, possibly through contrasting effects on energy balance.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3637175/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3637175/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jacquemont, Sebastien -- Reymond, Alexandre -- Zufferey, Flore -- Harewood, Louise -- Walters, Robin G -- Kutalik, Zoltan -- Martinet, Danielle -- Shen, Yiping -- Valsesia, Armand -- Beckmann, Noam D -- Thorleifsson, Gudmar -- Belfiore, Marco -- Bouquillon, Sonia -- Campion, Dominique -- de Leeuw, Nicole -- de Vries, Bert B A -- Esko, Tonu -- Fernandez, Bridget A -- Fernandez-Aranda, Fernando -- Fernandez-Real, Jose Manuel -- Gratacos, Monica -- Guilmatre, Audrey -- Hoyer, Juliane -- Jarvelin, Marjo-Riitta -- Kooy, R Frank -- Kurg, Ants -- Le Caignec, Cedric -- Mannik, Katrin -- Platt, Orah S -- Sanlaville, Damien -- Van Haelst, Mieke M -- Villatoro Gomez, Sergi -- Walha, Faida -- Wu, Bai-Lin -- Yu, Yongguo -- Aboura, Azzedine -- Addor, Marie-Claude -- Alembik, Yves -- Antonarakis, Stylianos E -- Arveiler, Benoit -- Barth, Magalie -- Bednarek, Nathalie -- Bena, Frederique -- Bergmann, Sven -- Beri, Mylene -- Bernardini, Laura -- Blaumeiser, Bettina -- Bonneau, Dominique -- Bottani, Armand -- Boute, Odile -- Brunner, Han G -- Cailley, Dorothee -- Callier, Patrick -- Chiesa, Jean -- Chrast, Jacqueline -- Coin, Lachlan -- Coutton, Charles -- Cuisset, Jean-Marie -- Cuvellier, Jean-Christophe -- David, Albert -- de Freminville, Benedicte -- Delobel, Bruno -- Delrue, Marie-Ange -- Demeer, Benedicte -- Descamps, Dominique -- Didelot, Gerard -- Dieterich, Klaus -- Disciglio, Vittoria -- Doco-Fenzy, Martine -- Drunat, Severine -- Duban-Bedu, Benedicte -- Dubourg, Christele -- El-Sayed Moustafa, Julia S -- Elliott, Paul -- Faas, Brigitte H W -- Faivre, Laurence -- Faudet, Anne -- Fellmann, Florence -- Ferrarini, Alessandra -- Fisher, Richard -- Flori, Elisabeth -- Forer, Lukas -- Gaillard, Dominique -- Gerard, Marion -- Gieger, Christian -- Gimelli, Stefania -- Gimelli, Giorgio -- Grabe, Hans J -- Guichet, Agnes -- Guillin, Olivier -- Hartikainen, Anna-Liisa -- Heron, Delphine -- Hippolyte, Loyse -- Holder, Muriel -- Homuth, Georg -- Isidor, Bertrand -- Jaillard, Sylvie -- Jaros, Zdenek -- Jimenez-Murcia, Susana -- Helas, Geraldine Joly -- Jonveaux, Philippe -- Kaksonen, Satu -- Keren, Boris -- Kloss-Brandstatter, Anita -- Knoers, Nine V A M -- Koolen, David A -- Kroisel, Peter M -- Kronenberg, Florian -- Labalme, Audrey -- Landais, Emilie -- Lapi, Elisabetta -- Layet, Valerie -- Legallic, Solenn -- Leheup, Bruno -- Leube, Barbara -- Lewis, Suzanne -- Lucas, Josette -- MacDermot, Kay D -- Magnusson, Pall -- Marshall, Christian -- Mathieu-Dramard, Michele -- McCarthy, Mark I -- Meitinger, Thomas -- Mencarelli, Maria Antonietta -- Merla, Giuseppe -- Moerman, Alexandre -- Mooser, Vincent -- Morice-Picard, Fanny -- Mucciolo, Mafalda -- Nauck, Matthias -- Ndiaye, Ndeye Coumba -- Nordgren, Ann -- Pasquier, Laurent -- Petit, Florence -- Pfundt, Rolph -- Plessis, Ghislaine -- Rajcan-Separovic, Evica -- Ramelli, Gian Paolo -- Rauch, Anita -- Ravazzolo, Roberto -- Reis, Andre -- Renieri, Alessandra -- Richart, Cristobal -- Ried, Janina S -- Rieubland, Claudine -- Roberts, Wendy -- Roetzer, Katharina M -- Rooryck, Caroline -- Rossi, Massimiliano -- Saemundsen, Evald -- Satre, Veronique -- Schurmann, Claudia -- Sigurdsson, Engilbert -- Stavropoulos, Dimitri J -- Stefansson, Hreinn -- Tengstrom, Carola -- Thorsteinsdottir, Unnur -- Tinahones, Francisco J -- Touraine, Renaud -- Vallee, Louis -- van Binsbergen, Ellen -- Van der Aa, Nathalie -- Vincent-Delorme, Catherine -- Visvikis-Siest, Sophie -- Vollenweider, Peter -- Volzke, Henry -- Vulto-van Silfhout, Anneke T -- Waeber, Gerard -- Wallgren-Pettersson, Carina -- Witwicki, Robert M -- Zwolinksi, Simon -- Andrieux, Joris -- Estivill, Xavier -- Gusella, James F -- Gustafsson, Omar -- Metspalu, Andres -- Scherer, Stephen W -- Stefansson, Kari -- Blakemore, Alexandra I F -- Beckmann, Jacques S -- Froguel, Philippe -- 090532/Wellcome Trust/United Kingdom -- 1RL1MH083268-01/MH/NIMH NIH HHS/ -- 5R01HL087679-02/HL/NHLBI NIH HHS/ -- 5R01MH63706:02/MH/NIMH NIH HHS/ -- AS2173/Autism Speaks/ -- G0500539/Medical Research Council/United Kingdom -- G0600705/Medical Research Council/United Kingdom -- G0801056/Medical Research Council/United Kingdom -- GM061354/GM/NIGMS NIH HHS/ -- MH071425/MH/NIMH NIH HHS/ -- MOP 74502/Canadian Institutes of Health Research/Canada -- Wellcome Trust/United Kingdom -- England -- Nature. 2011 Aug 31;478(7367):97-102. doi: 10.1038/nature10406.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Service of Medical Genetics, Centre Hospitalier Universitaire Vaudois, 1011 Lausanne, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21881559" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Aged ; Aging ; Body Height/genetics ; *Body Mass Index ; Case-Control Studies ; Child ; Child, Preschool ; Chromosomes, Human, Pair 16/*genetics ; Cohort Studies ; Comparative Genomic Hybridization ; Developmental Disabilities/genetics ; Energy Metabolism/genetics ; Europe ; Female ; Gene Dosage/*genetics ; Gene Duplication/genetics ; Gene Expression Profiling ; Genetic Predisposition to Disease/genetics ; Genome-Wide Association Study ; Head/anatomy & histology ; Heterozygote ; Humans ; Infant ; Infant, Newborn ; Male ; Mental Disorders/genetics ; Middle Aged ; Mutation/genetics ; North America ; Obesity/*genetics ; *Phenotype ; RNA, Messenger/analysis/genetics ; Sequence Deletion/genetics ; Thinness/*genetics ; Transcription, Genetic ; Young Adult
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2021
    Keywords: Key words Forsterite ; Atomistic simulation ; Adsorption of water ; Surface reactivity ; Morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract  We describe the application of atomistic simulation techniques to investigate the effect of associative and dissociative adsorption of water on the structures and stabilities of the low-index surfaces of forsterite. All surfaces are amenable to associative adsorption of water, while dissociative adsorption is energetically favourable on all but the non-dipolar {1 0 0} surface. Often, otherwise unstable (dipolar) surfaces are stabilised to a large extent by hydration, e.g. the dipolar {0 1 0} surface. However, on thermodynamic grounds we do not expect associatively adsorbed water to dissociate on all surfaces, as the energies released for dissociative adsorption of water on the non-dipolar {0 1 0} and {1 0 0} surfaces are less than those released for associative adsorption. As such, there is no energetic incentive for the associatively adsorbed water molecules to dissociate. The stabilities of the two terminations of the {0 1 0} surface, the main cleavage plane of forsterite, are reversed when hydroxylated, indicating that some dissolution of the magnesium ions may occur upon hydration, which is shown to be an exothermic process for both surface terminations. The equilibrium morphology was calculated as a way of assessing the change in surface energies. The experimental morphology of forsterite is adequately reproduced, suggesting that the relative stabilities of the surfaces, both unhydrated and hydroxylated, are calculated correctly.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 4326-4333 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We introduce a potential model for MgCO3 and CdCO3 which reproduces experimental structural parameters and solution energies. We employed atomistic simulation techniques to model the absorption and segregation of magnesium and cadmium ions to the low-index surfaces of calcite. Both magnesium and cadmium ions absorb at the surfaces from solution. The absorption energies are surface dependent, due to distinct relaxations of the different surfaces, and ion dependent with the smaller sized magnesium ion showing larger relaxations. The absorption energies are larger for magnesium than for cadmium, mainly due to the closer coordination of the water molecules to the magnesium substituted surfaces. The cadmium ions segregate to the bulk crystal more easily than the magnesium ions which prefer to remain at the surface. However, segregation energies for both cations in second and further layers of some surfaces are positive, indicating that once a calcium carbonate layer has overgrown the substituted surface layer, segregation to the bulk is energetically possible. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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