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4. Digital phenotyping and the COVID-19 pandemic: Capturing behavioral change in patients with psychiatric disorders

Author

Jagesar, R.R., Roozen, M.C., Heijden, I. van der, Ikani, N., Tyborowska, A.B., Penninx, B.W.J.H., Ruhé, H.G., Sommer, I.E.C., Kas, M.J.H., Vorstman, J.A.S., Jagesar, R.R., Roozen, M.C., Heijden, I. van der, Ikani, N., Tyborowska, A.B., Penninx, B.W.J.H., Ruhé, H.G., Sommer, I.E.C., Kas, M.J.H., and Vorstman, J.A.S.

Abstract

Contains fulltext : 227418.pdf (publisher's version ) (Closed access), The COVID-19 pandemic has led to unprecedented societal changes limiting us in our mobility and our ability to connect with others in person. These unusual but widespread changes provide a unique opportunity for studies using digital phenotyping tools. Digital phenotyping tools, such as mobile passive monitoring platforms (MPM), provide a new perspective on human behavior and hold promise to improve human behavioral research. However, there is currently little evidence that these tools can reliably detect changes in behavior. Considering the Considering the COVID-19 pandemic as a high impact common environmental factor we studied potential impact on behavior of participants using our mobile passive monitoring platform BEHAPP that was ambulatory tracking them during the COVID-19 pandemic. We pooled data from three MPM studies involving Schizophrenia (SZ), Major Depressive Disorder (MDD) and Bipolar Disorder (BD) patients (N = 12). We compared the data collected on weekdays during three weeks prior and three weeks subsequent to the start of the quarantine. We hypothesized an increase in communication and a decrease in mobility. We observed a significant increase in the total time spent on communication applications (median 179 and 243 min per week respectively, p = 0.005), and a significant decrease in the number of unique places visited (median 6 and 3 visits per week respectively, p = 0.007), while the total time spent at home did not change significantly (median 64 and 77 h per week, respectively, p = 0.594). The data provides a proof of principle that digital phenotyping tools can identify changes in human behavior incited by a common external environmental factor.

Published
2021

5. Shared genetic risk between eating disorder- and substance-use-related phenotypes: Evidence from genome-wide association studies

Author

Munn-Chernoff, M.A. Johnson, E.C. Chou, Y.-L. Coleman, J.R.I. Thornton, L.M. Walters, R.K. Yilmaz, Z. Baker, J.H. Hübel, C. Gordon, S. Medland, S.E. Watson, H.J. Gaspar, H.A. Bryois, J. Hinney, A. Leppä, V.M. Mattheisen, M. Ripke, S. Yao, S. Giusti-Rodríguez, P. Hanscombe, K.B. Adan, R.A.H. Alfredsson, L. Ando, T. Andreassen, O.A. Berrettini, W.H. Boehm, I. Boni, C. Boraska Perica, V. Buehren, K. Burghardt, R. Cassina, M. Cichon, S. Clementi, M. Cone, R.D. Courtet, P. Crow, S. Crowley, J.J. Danner, U.N. Davis, O.S.P. de Zwaan, M. Dedoussis, G. Degortes, D. DeSocio, J.E. Dick, D.M. Dikeos, D. Dina, C. Dmitrzak-Weglarz, M. Docampo, E. Duncan, L.E. Egberts, K. Ehrlich, S. Escaramís, G. Esko, T. Estivill, X. Farmer, A. Favaro, A. Fernández-Aranda, F. Fichter, M.M. Fischer, K. Föcker, M. Foretova, L. Forstner, A.J. Forzan, M. Franklin, C.S. Gallinger, S. Giegling, I. Giuranna, J. Gonidakis, F. Gorwood, P. Gratacos Mayora, M. Guillaume, S. Guo, Y. Hakonarson, H. Hatzikotoulas, K. Hauser, J. Hebebrand, J. Helder, S.G. Herms, S. Herpertz-Dahlmann, B. Herzog, W. Huckins, L.M. Hudson, J.I. Imgart, H. Inoko, H. Janout, V. Jiménez-Murcia, S. Julià, A. Kalsi, G. Kaminská, D. Karhunen, L. Karwautz, A. Kas, M.J.H. Kennedy, J.L. Keski-Rahkonen, A. Kiezebrink, K. Kim, Y.-R. Klump, K.L. Knudsen, G.P.S. La Via, M.C. Le Hellard, S. Levitan, R.D. Li, D. Lilenfeld, L. Lin, B.D. Lissowska, J. Luykx, J. Magistretti, P.J. Maj, M. Mannik, K. Marsal, S. Marshall, C.R. Mattingsdal, M. McDevitt, S. McGuffin, P. Metspalu, A. Meulenbelt, I. Micali, N. Mitchell, K. Monteleone, A.M. Monteleone, P. Nacmias, B. Navratilova, M. Ntalla, I. O'Toole, J.K. Ophoff, R.A. Padyukov, L. Palotie, A. Pantel, J. Papezova, H. Pinto, D. Rabionet, R. Raevuori, A. Ramoz, N. Reichborn-Kjennerud, T. Ricca, V. Ripatti, S. Ritschel, F. Roberts, M. Rotondo, A. Rujescu, D. Rybakowski, F. Santonastaso, P. Scherag, A. Scherer, S.W. Schmidt, U. Schork, N.J. Schosser, A. Seitz, J. Slachtova, L. Slagboom, P.E. Slof-Op't Landt, M.C.T. Slopien, A. Sorbi, S. Świątkowska, B. Szatkiewicz, J.P. Tachmazidou, I. Tenconi, E. Tortorella, A. Tozzi, F. Treasure, J. Tsitsika, A. Tyszkiewicz-Nwafor, M. Tziouvas, K. van Elburg, A.A. van Furth, E.F. Wagner, G. Walton, E. Widen, E. Zeggini, E. Zerwas, S. Zipfel, S. Bergen, A.W. Boden, J.M. Brandt, H. Crawford, S. Halmi, K.A. Horwood, L.J. Johnson, C. Kaplan, A.S. Kaye, W.H. Mitchell, J. Olsen, C.M. Pearson, J.F. Pedersen, N.L. Strober, M. Werge, T. Whiteman, D.C. Woodside, D.B. Grove, J. Henders, A.K. Larsen, J.T. Parker, R. Petersen, L.V. Jordan, J. Kennedy, M.A. Birgegård, A. Lichtenstein, P. Norring, C. Landén, M. Mortensen, P.B. Polimanti, R. McClintick, J.N. Adkins, A.E. Aliev, F. Bacanu, S.-A. Batzler, A. Bertelsen, S. Biernacka, J.M. Bigdeli, T.B. Chen, L.-S. Clarke, T.-K. Degenhardt, F. Docherty, A.R. Edwards, A.C. Foo, J.C. Fox, L. Frank, J. Hack, L.M. Hartmann, A.M. Hartz, S.M. Heilmann-Heimbach, S. Hodgkinson, C. Hoffmann, P. Hottenga, J.-J. Konte, B. Lahti, J. Lahti-Pulkkinen, M. Lai, D. Ligthart, L. Loukola, A. Maher, B.S. Mbarek, H. McIntosh, A.M. McQueen, M.B. Meyers, J.L. Milaneschi, Y. Palviainen, T. Peterson, R.E. Ryu, E. Saccone, N.L. Salvatore, J.E. Sanchez-Roige, S. Schwandt, M. Sherva, R. Streit, F. Strohmaier, J. Thomas, N. Wang, J.-C. Webb, B.T. Wedow, R. Wetherill, L. Wills, A.G. Zhou, H. Boardman, J.D. Chen, D. Choi, D.-S. Copeland, W.E. Culverhouse, R.C. Dahmen, N. Degenhardt, L. Domingue, B.W. Frye, M.A. Gäebel, W. Hayward, C. Ising, M. Keyes, M. Kiefer, F. Koller, G. Kramer, J. Kuperman, S. Lucae, S. Lynskey, M.T. Maier, W. Mann, K. Männistö, S. Müller-Myhsok, B. Murray, A.D. Nurnberger, J.I. Preuss, U. Räikkönen, K. Reynolds, M.D. Ridinger, M. Scherbaum, N. Schuckit, M.A. Soyka, M. Treutlein, J. Witt, S.H. Wodarz, N. Zill, P. Adkins, D.E. Boomsma, D.I. Bierut, L.J. Brown, S.A. Bucholz, K.K. Costello, E.J. de Wit, H. Diazgranados, N. Eriksson, J.G. Farrer, L.A. Foroud, T.M. Gillespie, N.A. Goate, A.M. Goldman, D. Grucza, R.A. Hancock, D.B. Harris, K.M. Hesselbrock, V. Hewitt, J.K. Hopfer, C.J. Iacono, W.G. Johnson, E.O. Karpyak, V.M. Kendler, K.S. Kranzler, H.R. Krauter, K. Lind, P.A. McGue, M. MacKillop, J. Madden, P.A.F. Maes, H.H. Magnusson, P.K.E. Nelson, E.C. Nöthen, M.M. Palmer, A.A. Penninx, B.W.J.H. Porjesz, B. Rice, J.P. Rietschel, M. Riley, B.P. Rose, R.J. Shen, P.-H. Silberg, J. Stallings, M.C. Tarter, R.E. Vanyukov, M.M. Vrieze, S. Wall, T.L. Whitfield, J.B. Zhao, H. Neale, B.M. Wade, T.D. Heath, A.C. Montgomery, G.W. Martin, N.G. Sullivan, P.F. Kaprio, J. Breen, G. Gelernter, J. Edenberg, H.J. Bulik, C.M. Agrawal, A.

Subjects
mental disorders
Abstract

Eating disorders and substance use disorders frequently co-occur. Twin studies reveal shared genetic variance between liabilities to eating disorders and substance use, with the strongest associations between symptoms of bulimia nervosa and problem alcohol use (genetic correlation [rg], twin-based = 0.23-0.53). We estimated the genetic correlation between eating disorder and substance use and disorder phenotypes using data from genome-wide association studies (GWAS). Four eating disorder phenotypes (anorexia nervosa [AN], AN with binge eating, AN without binge eating, and a bulimia nervosa factor score), and eight substance-use-related phenotypes (drinks per week, alcohol use disorder [AUD], smoking initiation, current smoking, cigarettes per day, nicotine dependence, cannabis initiation, and cannabis use disorder) from eight studies were included. Significant genetic correlations were adjusted for variants associated with major depressive disorder and schizophrenia. Total study sample sizes per phenotype ranged from ~2400 to ~537 000 individuals. We used linkage disequilibrium score regression to calculate single nucleotide polymorphism-based genetic correlations between eating disorder- and substance-use-related phenotypes. Significant positive genetic associations emerged between AUD and AN (rg = 0.18; false discovery rate q = 0.0006), cannabis initiation and AN (rg = 0.23; q < 0.0001), and cannabis initiation and AN with binge eating (rg = 0.27; q = 0.0016). Conversely, significant negative genetic correlations were observed between three nondiagnostic smoking phenotypes (smoking initiation, current smoking, and cigarettes per day) and AN without binge eating (rgs = −0.19 to −0.23; qs < 0.04). The genetic correlation between AUD and AN was no longer significant after co-varying for major depressive disorder loci. The patterns of association between eating disorder- and substance-use-related phenotypes highlights the potentially complex and substance-specific relationships among these behaviors. © 2020 Society for the Study of Addiction

Published
2021

6. A framework for assessing neuropsychiatric phenotypes by using smartphone-based location data

Author

Jongs, N. (Niels), Jagesar, R. (Raj), van Haren, N.E.M. (Neeltje E. M.), Penninx, B.W.J.H. (Brenda W. J. H.), Reus, L. (Lianne), Visser, P.J. (Pieter J.), Wee, N.J. (Nic) van der, Koning, I.M. (Ina M.), Arango, C. (Celso), Sommer, I.E.C. (Iris E. C.), Eijkemans, M.J.C. (Marinus J. C.), Vorstman, J.A.S., Kas, M.J.H. (Martien), Jongs, N. (Niels), Jagesar, R. (Raj), van Haren, N.E.M. (Neeltje E. M.), Penninx, B.W.J.H. (Brenda W. J. H.), Reus, L. (Lianne), Visser, P.J. (Pieter J.), Wee, N.J. (Nic) van der, Koning, I.M. (Ina M.), Arango, C. (Celso), Sommer, I.E.C. (Iris E. C.), Eijkemans, M.J.C. (Marinus J. C.), Vorstman, J.A.S., and Kas, M.J.H. (Martien)

Abstract

The use of smartphone-based location data to quantify behavior longitudinally and passively is rapidly gaining traction in neuropsychiatric research. However, a standardized and validated preprocessing framework for deriving behavioral phenotypes from smartphone-based location data is currently lacking. Here, we present a preprocessing framework consisting of methods that are validated in the context of geospatial data. This framework aims to generate context-enriched location data by identifying stationary, non-stationary, and recurrent stationary states in movement patterns. Subsequently, this context-enriched data is used to derive a series of behavioral phenotypes that are related to movement. By using smartphone-based location data collected from 245 subjects, including patients with schizophrenia, we show that the proposed framework is effective and accurate in generating context-enriched location data. This data was subsequently used to derive behavioral readouts that were sensitive in detecting behavioral nuances related to schizophrenia and aging, such as the time spent at home and the number of unique places visited. Overall, our results indicate that the proposed framework reliably

Published
2020
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7. Genome-wide association study identifies eight risk loci and implicates metabo-psychiatric origins for anorexia nervosa

Author

Watson, H.J., Yilmaz, Z., Thorntont, L.M., Hubel, C., Coleman, J.R.I., Gaspar, H.A., Bryois, J., Hinney, A., Leppa, V.M., Mattheisen, M., Medland, S.E., Ripke, S., Yao, S.Y., Giusti-Rodriguez, P., Hanscombe, K.B., Purves, K.L., Adan, R.A.H., Alfredsson, L., Ando, T., Andreassen, O.A., Baker, J.H., Berrettini, W.H., Boehm, I., Boni, C., Perica, V.B., Buehren, K., Burghardt, R., Cassina, M., Cichon, S., Clementi, M., Cone, R.D., Courtet, P., Crow, S., Crowley, J.J., Danner, U.N., Davis, O.S.P., Zwaan, M. de, Dedoussis, G., Degortes, D., DeSocio, J.E., Dick, D.M., Dikeos, D., Dina, C., Dmitrzak-Weglarz, M., Docampo, E., Duncan, L.E., Egberts, K., Ehrlich, S., Escaramis, G., Eskos, T., Estivill, X., Farmer, A., Favaro, A., Fernandez-Aranda, F., Fichter, M.M., Fischer, K., Focker, M., Foretova, L., Forstner, A.J., Forzan, M., Franklin, C.S., Gallinger, S., Giegling, I., Giuranna, J., Gonidakis, F., Gorwood, P., Mayora, M.G., Guillaume, S., Guo, Y.R., Hakonarson, H., Hatzikotoulas, K., Hauser, J., Hebebrand, J., Helder, S.G., Herms, S., Herpertz-Dahlmann, B., Herzog, W., Huckins, L.M., Hudson, J.I., Imgart, H., Inoko, H., Janout, V., Jimenez-Murcia, S., Julia, A., Kalsi, G., Kaminska, D., Kaprio, J., Karhunen, L., Karwautz, A., Kas, M.J.H., Kennedy, J.L., Keski-Rahkonen, A., Kiezebrink, K., Kim, Y.R., Klareskog, L., Klump, K.L., Knudsen, G.P.S., Via, M.C. la, Hellard, S. le, Levitan, R.D., Li, D., Lilenfeld, L., Lin, B.D., Lissowska, J., Luykx, J., Magistretti, P.J., Maj, M., Mannik, K., Marsal, S., Marshall, C.R., Mattingsdal, M., McDevitt, S., McGuffin, P., Metspalu, A., Meulenbelt, I., Micali, N., Mitchell, K., Monteleone, A.M., Monteleone, P., Munn-Chernoff, M.A., Nacmias, B., Navratilova, M., Ntalla, I., O'Toole, J.K., Ophoff, R.A., Padyukov, L., Palotie, A., Pantel, J., Papezova, H., Pinto, D., Rabionet, R., Raevuori, A., Ramoz, N., Reichborn-Kjennerud, T., Ricca, V., Ripatti, S., Ritschel, F., Roberts, M., Rotondo, A., Rujescu, D., Rybakowski, F., Santonastaso, P., Scherag, A., Scherer, S.W., Schmidt, U., Schork, N.J., Schosser, A., Seitz, J., Slachtova, L., Slagboom, P.E., Landt, M.C.T.S.O. 't, Slopien, A., Sorbi, S., Swiatkowska, B., Szatkiewicz, J.P., Tachmazidou, I., Tenconi, E., Tortorella, A., Tozzi, F., Treasure, J., Tsitsika, A., Tyszkiewicz-Nwafor, M., Tziouvas, K., Elbur, A.A. van, Furth, E.F. van, Wagner, G., Walton, E., Widen, E., Zeggini, E., Zerwas, S., Zipfel, S., Bergen, A.W., Boden, J.M., Brandt, H., Crawford, S., Halmi, K.A., Horwood, L.J., Johnson, C., Kaplan, A.S., Kaye, W.H., Mitchell, J.E., Olsen, C.M., Pearson, J.F., Pedersen, N.L., Strober, M., Werge, T., Whiteman, D.C., Woodside, D.B., Stuber, G.D., Gordon, S., Grove, J., Henders, A.K., Jureus, A., Kirk, K.M., Larsen, J.T., Parker, R., Petersen, L., Jordan, J., Kennedy, M., Montgomery, G.W., Wade, T.D., Birgegard, A., Lichtenstein, P., Norring, C., Landen, M., Martin, N.G., Mortensen, P.B., Sullivan, P.F., Breen, G., Bulik, C.M., Anorexia Nervosa Genetics Initiati, and Psychiat Genomics Consortium

Published
2019

8. Genome-wide association study identifies eight risk loci and implicates metabo-psychiatric origins for anorexia nervosa

Author

Watson, H.J. Yilmaz, Z. Thornton, L.M. Hübel, C. Coleman, J.R.I. Gaspar, H.A. Bryois, J. Hinney, A. Leppä, V.M. Mattheisen, M. Medland, S.E. Ripke, S. Yao, S. Giusti-Rodríguez, P. Hanscombe, K.B. Purves, K.L. Adan, R.A.H. Alfredsson, L. Ando, T. Andreassen, O.A. Baker, J.H. Berrettini, W.H. Boehm, I. Boni, C. Perica, V.B. Buehren, K. Burghardt, R. Cassina, M. Cichon, S. Clementi, M. Cone, R.D. Courtet, P. Crow, S. Crowley, J.J. Danner, U.N. Davis, O.S.P. de Zwaan, M. Dedoussis, G. Degortes, D. DeSocio, J.E. Dick, D.M. Dikeos, D. Dina, C. Dmitrzak-Weglarz, M. Docampo, E. Duncan, L.E. Egberts, K. Ehrlich, S. Escaramís, G. Esko, T. Estivill, X. Farmer, A. Favaro, A. Fernández-Aranda, F. Fichter, M.M. Fischer, K. Föcker, M. Foretova, L. Forstner, A.J. Forzan, M. Franklin, C.S. Gallinger, S. Giegling, I. Giuranna, J. Gonidakis, F. Gorwood, P. Mayora, M.G. Guillaume, S. Guo, Y. Hakonarson, H. Hatzikotoulas, K. Hauser, J. Hebebrand, J. Helder, S.G. Herms, S. Herpertz-Dahlmann, B. Herzog, W. Huckins, L.M. Hudson, J.I. Imgart, H. Inoko, H. Janout, V. Jiménez-Murcia, S. Julià, A. Kalsi, G. Kaminská, D. Kaprio, J. Karhunen, L. Karwautz, A. Kas, M.J.H. Kennedy, J.L. Keski-Rahkonen, A. Kiezebrink, K. Kim, Y.-R. Klareskog, L. Klump, K.L. Knudsen, G.P.S. La Via, M.C. Le Hellard, S. Levitan, R.D. Li, D. Lilenfeld, L. Lin, B.D. Lissowska, J. Luykx, J. Magistretti, P.J. Maj, M. Mannik, K. Marsal, S. Marshall, C.R. Mattingsdal, M. McDevitt, S. McGuffin, P. Metspalu, A. Meulenbelt, I. Micali, N. Mitchell, K. Monteleone, A.M. Monteleone, P. Munn-Chernoff, M.A. Nacmias, B. Navratilova, M. Ntalla, I. O’Toole, J.K. Ophoff, R.A. Padyukov, L. Palotie, A. Pantel, J. Papezova, H. Pinto, D. Rabionet, R. Raevuori, A. Ramoz, N. Reichborn-Kjennerud, T. Ricca, V. Ripatti, S. Ritschel, F. Roberts, M. Rotondo, A. Rujescu, D. Rybakowski, F. Santonastaso, P. Scherag, A. Scherer, S.W. Schmidt, U. Schork, N.J. Schosser, A. Seitz, J. Slachtova, L. Slagboom, P.E. Slof-Op ‘t Landt, M.C.T. Slopien, A. Sorbi, S. Świątkowska, B. Szatkiewicz, J.P. Tachmazidou, I. Tenconi, E. Tortorella, A. Tozzi, F. Treasure, J. Tsitsika, A. Tyszkiewicz-Nwafor, M. Tziouvas, K. van Elburg, A.A. van Furth, E.F. Wagner, G. Walton, E. Widen, E. Zeggini, E. Zerwas, S. Zipfel, S. Bergen, A.W. Boden, J.M. Brandt, H. Crawford, S. Halmi, K.A. Horwood, L.J. Johnson, C. Kaplan, A.S. Kaye, W.H. Mitchell, J.E. Olsen, C.M. Pearson, J.F. Pedersen, N.L. Strober, M. Werge, T. Whiteman, D.C. Woodside, D.B. Stuber, G.D. Gordon, S. Grove, J. Henders, A.K. Juréus, A. Kirk, K.M. Larsen, J.T. Parker, R. Petersen, L. Jordan, J. Kennedy, M. Montgomery, G.W. Wade, T.D. Birgegård, A. Lichtenstein, P. Norring, C. Landén, M. Martin, N.G. Mortensen, P.B. Sullivan, P.F. Breen, G. Bulik, C.M. Anorexia Nervosa Genetics Initiative Eating Disorders Working Group of the Psychiatric Genomics Consortium

Subjects
mental disorders
Abstract

Characterized primarily by a low body-mass index, anorexia nervosa is a complex and serious illness1, affecting 0.9–4% of women and 0.3% of men2–4, with twin-based heritability estimates of 50–60%5. Mortality rates are higher than those in other psychiatric disorders6, and outcomes are unacceptably poor7. Here we combine data from the Anorexia Nervosa Genetics Initiative (ANGI)8,9 and the Eating Disorders Working Group of the Psychiatric Genomics Consortium (PGC-ED) and conduct a genome-wide association study of 16,992 cases of anorexia nervosa and 55,525 controls, identifying eight significant loci. The genetic architecture of anorexia nervosa mirrors its clinical presentation, showing significant genetic correlations with psychiatric disorders, physical activity, and metabolic (including glycemic), lipid and anthropometric traits, independent of the effects of common variants associated with body-mass index. These results further encourage a reconceptualization of anorexia nervosa as a metabo-psychiatric disorder. Elucidating the metabolic component is a critical direction for future research, and paying attention to both psychiatric and metabolic components may be key to improving outcomes. © 2019, The Author(s), under exclusive licence to Springer Nature America, Inc.

Published
2019

10. Social brain, social dysfunction and social withdrawal

Author

Porcelli, S. (Stefano), Wee, N.J. (Nic) van der, van der Werff, S. (Steven), Aghajani, M. (Moji), Glennon, J.C. (Jeffrey C.), van Heukelum, S. (Sabrina), Mogavero, F. (Floriana), Lobo, A. (Antonio), Olivera, F.J. (Francisco Javier), Lobo, E. (Elena), Posadas, M. (Mar), Dukart, J. (Juergen), Kozak, R. (Rouba), Arce, E. (Estibaliz), Ikram, M.A. (Arfan), Vorstman, J.A.S., Bilderbeck, A. (Amy), Saris, I. (Ilja), Kas, M.J.H. (Martien), Serretti, A. (Alessandro), Porcelli, S. (Stefano), Wee, N.J. (Nic) van der, van der Werff, S. (Steven), Aghajani, M. (Moji), Glennon, J.C. (Jeffrey C.), van Heukelum, S. (Sabrina), Mogavero, F. (Floriana), Lobo, A. (Antonio), Olivera, F.J. (Francisco Javier), Lobo, E. (Elena), Posadas, M. (Mar), Dukart, J. (Juergen), Kozak, R. (Rouba), Arce, E. (Estibaliz), Ikram, M.A. (Arfan), Vorstman, J.A.S., Bilderbeck, A. (Amy), Saris, I. (Ilja), Kas, M.J.H. (Martien), and Serretti, A. (Alessandro)

Abstract

The human social brain is complex. Current knowledge fails to define the neurobiological processes underlying social behaviour involving the (patho-) physiological mechanisms that link system-level phenomena to the multiple hierarchies of brain function. Unfortunately, such a high complexity may also be associated with a high susceptibility to several pathogenic interventions. Consistently, social deficits sometimes represent the first signs of a number of neuropsychiatric disorders including schizophrenia (SCZ), Alzheimer's disease (AD) and major depressive disorder (MDD) which leads to a progressive social dysfunction. In the present review we summarize present knowledge linking neurobiological substrates sustaining social functioning, social dysfunction and social withdrawal in major psychiatric disorders. Interestingly, AD, SCZ, and MDD affect the social brain in similar ways. Thus, social dysfunction and its most evident clinical expression (i.e., social withdrawal) may represent an innovative transdiagnostic domain, with the potential of being an independent entity in terms of biological roots, with the perspective of targeted interventions.

Published
2018
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11. Correction: Investigation of common, low-frequency and rare genome-wide variation in anorexia nervosa

Author

Huckins, L.M. (L. M.), Hatzikotoulas, K. (K.), Southam, L. (Lorraine), Thornton, L.M. (L. M.), Steinberg, J. (J.), Aguilera-McKay, F. (F.), Treasure, J. (J.), Schmidt, U. (U.), Gunasinghe, C. (C.), Romero, A. (A.), Curtis, C. (C.), Rhodes, D. (D.), Moens, J. (J.), Kalsi, G. (G.), Dempster, D. (D.), Leung, R. (R.), Keohane, A. (A.), Burghardt, R. (R.), Ehrlich, S.M. (Stefan), Hebebrand, J. (Johannes), Hinney, A. (Anke), Ludolph, A.C. (Albert), Walton, E. (Esther), Deloukas, P. (Panagiotis), Hofman, A. (Albert), Palotie, A. (Aarno), Palta, P. (Priit), Rooij, F.J.A. (Frank) van, Stirrups, K. (Kathy), Adan, R.A.H. (Roger), Boni, C. (C.), Cone, R. (R.), Dedoussis, G.V. (George), Furth, E.F. (Eric) van, Gonidakis, F. (F.), Gorwood, P. (P.), Hudson, J. (J.), Kaprio, J. (J.), Kas, M.J.H. (Martien), Keski-Rahonen, A. (A.), Kiezebrink, K. (K.), Knudsen, G.-P. (G-P), Maj, M. (M.), Monteleone, A.M. (Alessio Maria), Monteleone, P. (P.), Raevuori, A.H. (A. H.), Reichborn-Kjennerud, T. (T.), Tozzi, F. (F.), Tsitsika, A. (Artemis), Elburg, A.A. (Annemarie) van, Collier, D.A. (David), Sullivan, P.F. (Patrick), Breen, G. (Gerome), Bulik, C.M. (C. M.), Zeggini, E. (E.), Huckins, L.M. (L. M.), Hatzikotoulas, K. (K.), Southam, L. (Lorraine), Thornton, L.M. (L. M.), Steinberg, J. (J.), Aguilera-McKay, F. (F.), Treasure, J. (J.), Schmidt, U. (U.), Gunasinghe, C. (C.), Romero, A. (A.), Curtis, C. (C.), Rhodes, D. (D.), Moens, J. (J.), Kalsi, G. (G.), Dempster, D. (D.), Leung, R. (R.), Keohane, A. (A.), Burghardt, R. (R.), Ehrlich, S.M. (Stefan), Hebebrand, J. (Johannes), Hinney, A. (Anke), Ludolph, A.C. (Albert), Walton, E. (Esther), Deloukas, P. (Panagiotis), Hofman, A. (Albert), Palotie, A. (Aarno), Palta, P. (Priit), Rooij, F.J.A. (Frank) van, Stirrups, K. (Kathy), Adan, R.A.H. (Roger), Boni, C. (C.), Cone, R. (R.), Dedoussis, G.V. (George), Furth, E.F. (Eric) van, Gonidakis, F. (F.), Gorwood, P. (P.), Hudson, J. (J.), Kaprio, J. (J.), Kas, M.J.H. (Martien), Keski-Rahonen, A. (A.), Kiezebrink, K. (K.), Knudsen, G.-P. (G-P), Maj, M. (M.), Monteleone, A.M. (Alessio Maria), Monteleone, P. (P.), Raevuori, A.H. (A. H.), Reichborn-Kjennerud, T. (T.), Tozzi, F. (F.), Tsitsika, A. (Artemis), Elburg, A.A. (Annemarie) van, Collier, D.A. (David), Sullivan, P.F. (Patrick), Breen, G. (Gerome), Bulik, C.M. (C. M.), and Zeggini, E. (E.)

Abstract

The fortieth author's name was listed incorrectly. The correct presentation is A Keski-Rahkonen.

Published
2018
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12. Investigation of common, low-frequency and rare genome-wide variation in anorexia nervosa

Author

Huckins, L.M. (L. M.), Hatzikotoulas, K. (K.), Southam, L. (Lorraine), Thornton, L.M. (L. M.), Steinberg, J. (J.), Aguilera-Mckay, F. (F.), Treasure, J. (J.), Schmidt, U. (U.), Gunasinghe, C. (C.), Romero, A. (Atocha), Curtis, C. (C.), Rhodes, D. (D.), Moens, J. (J.), Kalsi, G. (G.), Dempster, D. (D.), Leung, R. (R.), Keohane, A. (A.), Burghardt, R. (R.), Ehrlich, S.M. (Stefan), Hebebrand, J. (Johannes), Hinney, A. (Anke), Ludolph, A.C. (Albert), Walton, E. (Esther), Deloukas, P. (P.), Hofman, A. (A.), Palotie, A. (A.), Palta, P. (Priit), Rooij, F.J.A. (Frank) van, Stirrups, K. (Kathy), Adan, R. (R.), Boni, C. (C.), Cone, R. (R.), Dedoussis, G.V. (George), Furth, E.F. (Eric) van, Gonidakis, F. (F.), Gorwood, P. (P.), Hudson, J. (J.), Kaprio, J. (J.), Kas, M.J.H. (Martien), Keski-Rahonen, A. (A.), Kiezebrink, K. (K.), Knudsen, G.-P. (G. P.), Slof-Op 'T Landt, M.C.T. (M. C.T.), Maj, M. (M.), Monteleone, A.M. (Alessio Maria), Monteleone, P. (P.), Raevuori, A.H. (A. H.), Reichborn-Kjennerud, T. (T.), Tozzi, F. (F.), Tsitsika, A. (A.), Elburg, A.A. (Annemarie) van, Collier, D.A. (David), Sullivan, P.F. (Patrick), Breen, G. (Gerome), Bulik, C.M. (C. M.), Zeggini, E. (E.), Huckins, L.M. (L. M.), Hatzikotoulas, K. (K.), Southam, L. (Lorraine), Thornton, L.M. (L. M.), Steinberg, J. (J.), Aguilera-Mckay, F. (F.), Treasure, J. (J.), Schmidt, U. (U.), Gunasinghe, C. (C.), Romero, A. (Atocha), Curtis, C. (C.), Rhodes, D. (D.), Moens, J. (J.), Kalsi, G. (G.), Dempster, D. (D.), Leung, R. (R.), Keohane, A. (A.), Burghardt, R. (R.), Ehrlich, S.M. (Stefan), Hebebrand, J. (Johannes), Hinney, A. (Anke), Ludolph, A.C. (Albert), Walton, E. (Esther), Deloukas, P. (P.), Hofman, A. (A.), Palotie, A. (A.), Palta, P. (Priit), Rooij, F.J.A. (Frank) van, Stirrups, K. (Kathy), Adan, R. (R.), Boni, C. (C.), Cone, R. (R.), Dedoussis, G.V. (George), Furth, E.F. (Eric) van, Gonidakis, F. (F.), Gorwood, P. (P.), Hudson, J. (J.), Kaprio, J. (J.), Kas, M.J.H. (Martien), Keski-Rahonen, A. (A.), Kiezebrink, K. (K.), Knudsen, G.-P. (G. P.), Slof-Op 'T Landt, M.C.T. (M. C.T.), Maj, M. (M.), Monteleone, A.M. (Alessio Maria), Monteleone, P. (P.), Raevuori, A.H. (A. H.), Reichborn-Kjennerud, T. (T.), Tozzi, F. (F.), Tsitsika, A. (A.), Elburg, A.A. (Annemarie) van, Collier, D.A. (David), Sullivan, P.F. (Patrick), Breen, G. (Gerome), Bulik, C.M. (C. M.), and Zeggini, E. (E.)

Abstract

Anorexia nervosa (AN) is a complex neuropsychiatric disorder presenting with dangerously low body weight, and a deep and persistent fear of gaining weight. To date, only one genome-wide significant locus associated with AN has been identified. We performed an exome-chip based genome-wide association studies (GWAS) in 2158 cases from nine populations of European origin and 15 485 ancestrally matched controls. Unlike previous studies, this GWAS also probed association in low-frequency and rare variants. Sixteen independent variants were taken forward for in silico and de novo replication (11 common and 5 rare). No findings reached genome-wide significance. Two notable common variants were identified: rs10791286, an intronic variant in OPCML (P=9.89 × 10 -6), and rs7700147, an intergenic variant (P=2.93 × 10 -5). No low-frequency variant associations were identified at genome-wide significance, although the study was well-powered to detect low-frequency variants with large effect sizes, suggesting that there may be no AN loci in this genomic search space with large effect sizes.

Published
2018
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13. A genome-wide association study of anorexia nervosa suggests a risk locus implicated in dysregulated leptin signaling

Author

Li, D. Chang, X. Connolly, J.J. Tian, L. Liu, Y. Bhoj, E.J. Robinson, N. Abrams, D. Li, Y.R. Bradfield, J.P. Kim, C.E. Li, J. Wang, F. Snyder, J. Lemma, M. Hou, C. Wei, Z. Guo, Y. Qiu, H. Mentch, F.D. Thomas, K.A. Chiavacci, R.M. Cone, R. Li, B. Sleiman, P.A. Hakonarson, H. Perica, V.B. Franklin, C.S. Floyd, J.A.B. Thornton, L.M. Huckins, L.M. Southam, L. Rayner, N.W. Tachmazidou, I. Schmidt, U. Tozzi, F. Kiezebrink, K. Hebebrand, J. Gorwood, P. Adan, R.A.H. Kas, M.J.H. Favaro, A. Santonastaso, P. Fernánde-Aranda, F. Gratacos, M. Rybakowski, F. Dmitrzak-Weglarz, M. Kaprio, J. Keski-Rahkonen, A. Raevuori-Helkamaa, A. Furth, E.F.V. Slof-Opt Landt, M.C.T. Hudson, J.I. Reichborn-Kjennerud, T. Knudsen, G.P.S. Monteleone, P. Karwautz, A. Berrettini, W.H. Schork, N.J. Ando, T. Inoko, H. Esko, T. Fischer, K. Männik, K. Metspalu, A. Baker, J.H. DeSocio, J.E. Hilliard, C.E. O'Toole, J.K. Pantel, J. Szatkiewicz, J.P. Zerwas, S. Davis, O.S.P. Helder, S. Bühren, K. Burghardt, R. De Zwaan, M. Egberts, K. Ehrlich, S. Herpertz-Dahlmann, B. Herzog, W. Imgart, H. Scherag, A. Zipfel, S. Boni, C. Ramoz, N. Versini, A. Danner, U.N. Hendriks, J. Koeleman, B.P.C. Ophoff, R.A. Strengman, E. Van Elburg, A.A. Bruson, A. Clementi, M. Degortes, D. Forzan, M. Tenconi, E. Docampo, E. Escaramís, G. Jiménez-Murcia, S. Lissowska, J. Rajewski, A. Szeszenia-Dabrowska, N. Slopien, A. Hauser, J. Karhunen, L. Meulenbelt, I. Slagboom, P.E. Tortorella, A. Maj, M. Dedoussis, G. DIkeos, D. Gonidakis, F. Tziouvas, K. Tsitsika, A. Papezova, H. Slachtova, L. Martaskova, D. Kennedy, J.L. Levitan, R.D. Yilmaz, Z. Huemer, J. Koubek, D. Merl, E. Wagner, G. Lichtenstein, P. Breen, G. Cohen-Woods, S. Farmer, A. McGuffin, P. Cichon, S. Giegling, I. Herms, S. Rujescu, D. Schreiber, S. Wichmann, H.-E. DIna, C. Sladek, R. Gambaro, G. Soranzo, N. Julia, A. Marsal, S. Rabionet, R. Gaborieau, V. DIck, D.M. Palotie, A. Ripatti, S. Widén, E. Andreassen, O.A. Espeseth, T. Lundervold, A. Reinvang, I. Steen, V.M. Le Hellard, S. Mattingsdal, M. Ntalla, I. Bencko, V. Foretova, L. Janout, V. Navratilova, M. Gallinger, S. Pinto, D. Scherer, S.W. Aschauer, H. Carlberg, L. Schosser, A. Alfredsson, L. DIng, B. Klareskog, L. Padyukov, L. Finan, C. Kalsi, G. Roberts, M. Barrett, J.C. Estivill, X. Hinney, A. Sullivan, P.F. Zeggini, E. Bulik, C.M. Brandt, H. Crawford, S. Crow, S. Fichter, M.M. Halmi, K.A. Johnson, C. Kaplan, A.S. La Via, M.C. Mitchell, J. Strober, M. Rotondo, A. Treasure, J. Woodside, D.B. Keel, P.K. Klump, K.L. Lilenfeld, L. Bergen, A.W. Kaye, W. Magistretti, P.

Abstract

We conducted a genome-wide association study (GWAS) of anorexia nervosa (AN) using a stringently defined phenotype. Analysis of phenotypic variability led to the identification of a specific genetic risk factor that approached genome-wide significance (rs929626 in EBF1 (Early B-Cell Factor 1); P = 2.04 × 10-7; OR = 0.7; 95% confidence interval (CI) = 0.61-0.8) with independent replication (P = 0.04), suggesting a variant-mediated dysregulation of leptin signaling may play a role in AN. Multiple SNPs in LD with the variant support the nominal association. This demonstrates that although the clinical and etiologic heterogeneity of AN is universally recognized, further careful sub-typing of cases may provide more precise genomic signals. In this study, through a refinement of the phenotype spectrum of AN, we present a replicable GWAS signal that is nominally associated with AN, highlighting a potentially important candidate locus for further investigation. © 2017 The Author(s).

Published
2017

14. Evidence for three genetic loci involved in both anorexia nervosa risk and variation of body mass index

Author

Hinney, A. (Anke), Kesselmeier, M. (M.), Jall, S. (S.), Volckmar, A.-L. (A. L.), Föcker, M. (M.), Antel, J. (J.), Heid, I.M. (Iris), Winkler, T.W. (Thomas W.), Grant, S.F.A. (S. F.A.), Guo, Y. (Yongli), Bergen, A.W. (Andrew), Grant, S.F.A. (Struan), Berrettini, W. (Wade), Hakonarson, H. (Hakon), Herpertz-Dahlmann, B. (B.), De Zwaan, M. (M.), Herzog, W. (W.), Ehrlich, S.M. (Stefan), Zipfel, S. (S.), Egberts, K. (Karin), Adan, R. (R.), Brandys, M. (M.), Elburg, A.A. (Annemarie) van, Boraska Perica, V. (V.), Müller, T.D., Tschöp, M.H. (M. H.), Zeggini, E. (Eleftheria), Bulik, C.M. (C. M.), Collier, D.A. (David), Scherag, A. (A.), Hebebrand, J. (J.), Tschop, M. (Matthias), Floyd, J. (Jamie), Thornton, L.M. (Laura), Huckins, L.M. (Laura M), Southam, L. (Lorraine), Rayner, N.W. (Nigel William), Tachmazidou, I. (Ioanna), Klump, K.L. (K. L.), Treasure, J. (Janet), Lewis, C.M. (Cathryn), Schmidt, U. (Ulrike), Tozzi, F. (Federica), Iezebrink, K. (Kirsty), Gorwood, P. (Philip), Kas, M.J.H. (Martien), Favaro, A. (Angela), Santonastaso, P. (Paolo), Fernández-Aranda, F. (Fernando), Gratacos, M. (Monica), Rybakowski, F. (Filip), Dmitrzak-Weglarz, M. (Monika), Kaprio, J. (Jaakko), Keski-Rahkonen, A. (Anna), Raevuori-Helkamaa, A. (Anu), Furth, E.F. (Eric) van, Slof-Op’t Landt, M.C.T. (Margarita C. T.), Hudson, J.I. (James I), Knudsen, G.P.S. (Gun Peggy S.), Monteleone, P. (Palmiero), Kaplan, A.S. (Allan S), Karwautz, A. (Andreas), Li, D. (Dong), Komaki, G. (Gen), Ando, T. (Tetsuya), Inoko, H. (Hidetoshi), Esko, T. (T.), Fischer, K. (Krista), Männik, K. (Katrin), Metspalu, A. (Andres), Baker, J.H. (Jessica H), Cone, R.D. (Roger D), Esko, T. (Tõnu), DeSocio, J.E. (Janiece E), Hilliard, C.E. (Christopher E), O’Toole, J.K. (Julie K), Pantel, J. (Jacques), Szatkiewicz, J.P. (Jin P), Taico, C. (Chrysecolla), Zerwas, S. (Stephanie), Trace, S.E. (Sara E), Davis, O.S.P. (Oliver S.), Helder, S. (Sietske), Bühren, K. (Katharina), Burghardt, R. (Roland), Imgart, H. (Hartmut), Scherag, A. (Andre), Boni, C. (Claudette), Ramoz, N. (Nicolas), Versini, A. (Audrey), Danner, U.N. (Unna N), de Kove, C. (Carolien), Hendriks, J. (Judith), Koeleman, B.P.C. (Bobby P. C.), Ophoff, R.A. (Roel), Strengman, E. (Eric), Bruson, A. (Alice), Clementi, M. (Maurizio), Degortes, D. (Daniela), Forzan, M. (Monica), Tenconi, E. (Elena), Docampo, E. (Elisa), Jiménez-Murcia, G.E.S. (Geòrgia Escaramí Susana), Lissowska, J. (Jolanta), Rajewski, A. (Andrzej), Szeszenia-Dabrowska, N. (Neonila), Slopien, A. (Agnieszka), Hauser, J. (J.), Karhunen, L. (Leila), Meulenbelt, I. (Ingrid), Slagboom, P.E. (Eline), Tortorella, A. (Alfonso), Maj, M. (Mario), Dedoussis, G.V. (George), Dedoussis, G.V. (G. V.), Koeleman, B.P.C. (Bobby), Gonidakis, F. (Fragiskos), Tziouvas, K. (Konstantinos), Tsitsika, A. (Artemis), Papezova, H. (Hana), Slachtova, L. (Lenka), Martaskova, D. (Debora), Kennedy, J.L., Levitan, R.D. (Robert D), Yilmaz, Z. (Zeynep), Huemer, J. (Julia), Koubek, D. (Doris), Merl, E. (Elisabeth), Wagner, G. (Gudrun), Lichtenstein, P. (Paul), Breen, G. (Gerome), Cohen-Woods, S. (Sarah), Farmer, A.E. (Anne E), Mcguffin, P. (Peter), Cichon, S. (Sven), Giegling, I. (Ina), Herms, S. (Stefan), Rujescu, D. (Dan), Schreiber, S. (Stefan), Wichmann, H.E. (Heinz Erich), Sladek, R. (Rob), Gambaro, G. (Giovanni), Soranzo, N. (Nicole), Julia, A. (Antonio), Marsal, S. (Sara), Rabionet, R. (Raquel), Gaborieau, V. (Valerie), Dick, D.M. (Danielle), Palotie, A. (A.), Ripatti, S. (Samuli), Widen, E., Espeseth, T. (Thomas), Lundervold, A.J. (Astri), Reinvang, I. (Ivar), Steen, V.M. (Vidar), Le Hellard, S. (Stephanie), Mattingsdal, M. (Morten), Ntalla, I. (Ioanna), Bencko, V. (Vladimir), Foretova, L. (Lenka), Janout, V. (Vladimir), Navratilova, M. (Marie), Pinto, D. (Dalila), Scherer, S.W. (Stephen W), Carlberg, L. (Laura), Schosser, A. (Alexandra), Alfredsson, L. (Lars), Pinto, D. (Duane), Scherer, S.W. (Stephen), Padyukov, L. (Leonid), Finan, C. (Chris), Kalsi, G. (Gursharan), Roberts, M. (Marion), Logan, D.W. (Darren W), Peltonen, L. (Leena Johanna), Ritchie, G.R.S. (Graham R.S.), Barrett, J.C. (Jeffrey), Estivill, X. (Xavier), Sullivan, P.F. (Patrick), Anderson, C.A. (Carl A), McGinnis, R. (Ralph), Sambrook, J. (Jennifer), Stephens, J. (Jonathan), Ouwehand, W.H. (Willem), McArdle, P.F. (P. F.), Ring, S.M. (Susan), Strachan, D.P. (David), Alexander, G. (Graeme), Conlon, P.J. (Peter J), Dominiczak, A. (Anna), Duncanson, A. (Audrey), Padyukov, L. (L.), Langford, C. (Cordelia), Lord, G. (Graham), Conlon, P. (Peter), Sandford, R. (Richard), Sheerin, N. (Neil), Vannberg, F.O. (Frederik O), Blackburn, H. (Hannah), Maxwell, A.P. (A.), Edkins, T. (Ted), Gillman, M.W. (Matthew W.), Gray, E. (Emma), Hunt, S.E. (Sarah E), Nengut, S.-G. (Suna-Gumuscu), Potter, S.C. (Simon), Rich, S.S. (Stephen), Simpkin, D. (Douglas), Whittaker, P. (Pamela), Ang, W.Q. (Wei), Atalay, M. (Mustafa), Beijsterveldt, C.E.M. (Toos) van, Bergen, N. (N.), Benke, K. (K.), Berry, D. (Diane), Boomsma, D.I. (Dorret), Bradfield, J.P. (Jonathan), Charoen, P. (Pimphen), Coin, L. (Lachlan), Cooper, C. (C.), Cousminer, D.L. (Diana), Das, S. (Shikta), Elliott, P. (P.), Evans, D.M. (D. M.), Feenstra, B. (B.), Flexeder, C. (Claudia), Frayling, T.M. (Timothy), Freathy, R.M. (Rachel), Gaillard, R. (R.), Geller, F. (Frank), Groen-Blokhuis, M. (Maria), Goh, L.K. (L. K.), Guxens Junyent, M. (Mònica), Hattersley, A.T. (Andrew), Haworth, C.M.A. (Claire M.), Hadley, D. (D.), Heinrich, J. (J.), Hirschhorn, J.N. (Joel), Hocher, B. (Berthold), Holloway, J.W. (J. W.), Holst, J.J., Hottenga, J.J. (Jouke Jan), Horikoshi, M. (Momoko), Huikari, V. (Ville), Hypponen, E. (E.), Iñiguez, C. (C.), Jaddoe, V.W. (V. W.), Jarvelin, M.R. (M. R.), Kaakinen, M. (M.), Kilpeläinen, T.O. (Tuomas), Hypponen, E. (Elina), Kowgier, M. (Matthew), Lakka, T.A. (Timo), Cooper, C. (Charles), Lange, L.A. (Leslie), Lawlor, D.A. (D. A.), Lehtimäki, T. (Terho), Lewin, A. (Alex), Elliott, P. (Paul), Lindi, V. (Virpi), Maggi, R. (Reedik), Feenstra, B. (Bjarke), McCarthy, M.I. (M. I.), Melbye, M. (Mads), Middeldorp, C.M. (Christel), Millwood, I.Y. (Iona), Mohlke, K.L. (Karen), Mook-Kanamori, D.O. (D. O.), Murray, J.C. (Jeffrey), Nivard, M. (Michel), Nohr, C. (Christian), Oken, E. (Emily), Ong, K.K. (K. K.), O'Reilly, P.F. (P. F.), Palmer, C. (Cameron), Panoutsopoulou, K. (K.), Pararajasingham, J. (Jennifer), Pearson, E.R. (E. R.), Pennell, C.E. (Craig), Power, C. (Christopher), Price, T.S. (Thomas), Prokopenko, I. (Inga), Raitakari, O.T. (O. T.), Rodriguez, A. (A.), Salem, R.M. (Rany), Saw, S.M. (S. M.), Sebert, S. (S.), Siitonen, N. (Niina), Jaddoe, V.W.V. (Vincent), Sørensen, T.I.A. (Thorkild), Sovio, U. (Ulla), Lawlor, D.A. (Debbie), Sunyer, J. (J.), Taal, H.R. (Rob), Teo, Y.Y. (Y. Y.), Thiering, E. (Elisabeth), Tiesler, C. (C.), Timpson, N.J. (Nicholas), Uitterlinden, A.G. (André), Valcárcel, B. (Beatriz), Teo, Y.Y. (Yik Ying), White, S.J. (Stefan), Willemsen, G.A.H.M. (Gonneke), Wilson, J.F. (J. F.), Yaghootkar, H. (H.), Elks, C.E. (Cathy), Perry, J.R. (J. R.), Sulem, P. (Patrick), Chasman, D.I. (Daniel), Franceschini, N. (Nora), He, C. (C.), Lunetta, K.L. (Kathryn), Visser, J.A. (Jenny), Byrne, E.M. (E. M.), Gudbjartsson, D.F. (Daniel), Koller, D.L. (Daniel), Kutalik, Z. (Zoltán), Lin, P. (P.), Mangino, M. (Massimo), Byrne, E.M. (Enda), Smith, A.V. (Albert), Stolk, L. (Lisette), Wingerden, S. (Sophie) van, Zhao, J.H. (J. H.), Albrecht, E. (Eva), Corre, T. (Tanguy), Ingelsson, E. (Erik), Hayward, C. (Caroline), Magnusson, P.K. (Patrik), Smith, A.V. (Davey), Chanock, S.J. (Stephen), Warrington, M. (M.), Zgaga, L. (L.), Alavere, H. (Helene), Amin, N. (Najaf), Aspelund, T. (T.), Ulivi, S. (Shelia), Sunyer, J. (Jordi), Berenson, G. (Gerald), Bergmann, S.M. (Sven), Boerwinkle, E. (E.), Buring, J.E. (Julie), Busonero, F. (F.), Barroso, I.E. (Inês), Chanock, S.J. (S. J.), Warrington, N.M. (Nicole), Couper, D.J. (David), Coviello, A.D. (Andrea), Busonero, F., Faire, U. (Ulf) de, de Geus, E.J. (E. J.), Deloukas, P. (Panagiotis), Döring, A. (Angela), Davey Smith, G. (G.), Adamo, P. (Pio) d', Eiriksdottir, G. (Gudny), Geus, E.J.C. (Eco) de, Hagen, K. (Knut), Ferrucci, L. (L.), Folsom, A.R. (A. R.), Foroud, T. (T.), Garcia, M.E. (M.), Gasparini, P. (P.), Gieger, C. (Christian), Gudnason, V. (V.), Folsom, A.R. (Aaron), Hankinson, S.E. (S. E.), Ferreli, L. (Liana), Gasparini, P. (Paolo), Hernandez, D.G. (Dena), Hofman, A. (Albert), Hu, F.B. (F. B.), Illig, T. (T.), Jarvelin, M.-R. (Marjo-Riitta), Johnson, A.D. (Andrew), Karasik, D. (David), Khaw, K.T. (K. T.), Kiel, D.P. (Douglas P.), Kolcic, I. (Ivana), Kraft, P. (Peter), Launer, L.J. (Lenore), Laven, J.S. (J. S.), Li, S. (S.), Liu, J. (J.), Levy, D. (D.), Martin, N.G. (N. G.), Aspelund, T. (Thor), Nalls, M.A. (Michael), Navarro, P. (Pau), Nelis, M. (M.), Ness, A.R. (A. R.), Boerwinkle, E.A. (Eric), Oostra, B.A. (Ben), Peacock, M. (M.), Pare, G. (Guillame), Parker, A.N. (Alex), Pedersen, N.L. (Nancy), Cornelis, M. (Marilyn), Polasek, O. (Ozren), Plump, A.S. (A. S.), Peacock, M. (Munro), Porcu, E. (Eleonora), Rafnar, T. (Thorunn), Rice, J.P. (John), Rivadeneira, F. (F.), Sala, C. (Cinzia), Salomaa, V. (Veikko), Sanna, S. (Serena), Schlessinger, D. (D.), Scuteri, A. (A.), Segrè, A.V. (Ayellet), Foroud, T. (Tatiana), Srinivasan, S.R. (Sathanur), Tammesoo, M.L. (M. L.), Tikkanen, E. (Emmi), Toniolo, D. (Daniela), Scuteri, A. (Angelo), Tryggvadottir, L. (Laufey), Tyrer, J. (J.), Uda, M. (M.), van Dam, R.M. (R. M.), Meurs, J.B.J. (Joyce) van, Vollenweider, P. (Peter), Waeber, G. (Gérard), Wareham, N.J. (Nick), Waterworth, D. (Dawn), Weedon, M.N. (Michael), Wright, A.F. (Alan), Young, L. (L.), Zhai, G. (G.), Zhuang, W.V. (W. V.), Bierut, L.J. (L. J.), Boyd, H.A. (H. A.), Crisponi, L. (Laura), Demerath, E.W. (E. W.), Duijn, C.M. (Cornelia) van, Econs, M.J. (M. J.), Harris, T.B. (Tamara), Bierut, L.J. (Laura), Loos, R.J.F. (Ruth), Ridker, P.M. (Paul), Demerath, E.W. (Ellen), Streeten, E.A. (Elizabeth), Econs, M.J. (Michael), Thorsteinsdottir, U. (Unnur), Widen, E. (E.), Murabito, J. (Joanne), Ness, A.R. (Andrew), Spector, T.D. (Timothy), Crawford, S. (Steve), Crow, S. (Scott), Fichter, M.M. (M. M.), Halmi, K.A. (K. A.), Palotie, A. (Aarno), La Via, M. (Maria), Mitchell, J. (James), Strober, M. (Michael), Rotondo, A. (Alessandro), Woodside, D.B. (D Blake), Keel, P. (Pamela), Lilenfeld, L. (Lisa), Rivadeneira Ramirez, F. (Fernando), Magistretti, P. (Pierre), Montgomery, G.W. (G. W.), Hinney, A. (Anke), Kesselmeier, M. (M.), Jall, S. (S.), Volckmar, A.-L. (A. L.), Föcker, M. (M.), Antel, J. (J.), Heid, I.M. (Iris), Winkler, T.W. (Thomas W.), Grant, S.F.A. (S. F.A.), Guo, Y. (Yongli), Bergen, A.W. (Andrew), Grant, S.F.A. (Struan), Berrettini, W. (Wade), Hakonarson, H. (Hakon), Herpertz-Dahlmann, B. (B.), De Zwaan, M. (M.), Herzog, W. (W.), Ehrlich, S.M. (Stefan), Zipfel, S. (S.), Egberts, K. (Karin), Adan, R. (R.), Brandys, M. (M.), Elburg, A.A. (Annemarie) van, Boraska Perica, V. (V.), Müller, T.D., Tschöp, M.H. (M. H.), Zeggini, E. (Eleftheria), Bulik, C.M. (C. M.), Collier, D.A. (David), Scherag, A. (A.), Hebebrand, J. (J.), Tschop, M. (Matthias), Floyd, J. (Jamie), Thornton, L.M. (Laura), Huckins, L.M. (Laura M), Southam, L. (Lorraine), Rayner, N.W. (Nigel William), Tachmazidou, I. (Ioanna), Klump, K.L. (K. L.), Treasure, J. (Janet), Lewis, C.M. (Cathryn), Schmidt, U. (Ulrike), Tozzi, F. (Federica), Iezebrink, K. (Kirsty), Gorwood, P. (Philip), Kas, M.J.H. (Martien), Favaro, A. (Angela), Santonastaso, P. (Paolo), Fernández-Aranda, F. (Fernando), Gratacos, M. (Monica), Rybakowski, F. (Filip), Dmitrzak-Weglarz, M. (Monika), Kaprio, J. (Jaakko), Keski-Rahkonen, A. (Anna), Raevuori-Helkamaa, A. (Anu), Furth, E.F. (Eric) van, Slof-Op’t Landt, M.C.T. (Margarita C. T.), Hudson, J.I. (James I), Knudsen, G.P.S. (Gun Peggy S.), Monteleone, P. (Palmiero), Kaplan, A.S. (Allan S), Karwautz, A. (Andreas), Li, D. (Dong), Komaki, G. (Gen), Ando, T. (Tetsuya), Inoko, H. (Hidetoshi), Esko, T. (T.), Fischer, K. (Krista), Männik, K. (Katrin), Metspalu, A. (Andres), Baker, J.H. (Jessica H), Cone, R.D. (Roger D), Esko, T. (Tõnu), DeSocio, J.E. (Janiece E), Hilliard, C.E. (Christopher E), O’Toole, J.K. (Julie K), Pantel, J. (Jacques), Szatkiewicz, J.P. (Jin P), Taico, C. (Chrysecolla), Zerwas, S. (Stephanie), Trace, S.E. (Sara E), Davis, O.S.P. (Oliver S.), Helder, S. (Sietske), Bühren, K. (Katharina), Burghardt, R. (Roland), Imgart, H. (Hartmut), Scherag, A. (Andre), Boni, C. (Claudette), Ramoz, N. (Nicolas), Versini, A. (Audrey), Danner, U.N. (Unna N), de Kove, C. (Carolien), Hendriks, J. (Judith), Koeleman, B.P.C. (Bobby P. C.), Ophoff, R.A. (Roel), Strengman, E. (Eric), Bruson, A. (Alice), Clementi, M. (Maurizio), Degortes, D. (Daniela), Forzan, M. (Monica), Tenconi, E. (Elena), Docampo, E. (Elisa), Jiménez-Murcia, G.E.S. (Geòrgia Escaramí Susana), Lissowska, J. (Jolanta), Rajewski, A. (Andrzej), Szeszenia-Dabrowska, N. (Neonila), Slopien, A. (Agnieszka), Hauser, J. (J.), Karhunen, L. (Leila), Meulenbelt, I. (Ingrid), Slagboom, P.E. (Eline), Tortorella, A. (Alfonso), Maj, M. (Mario), Dedoussis, G.V. (George), Dedoussis, G.V. (G. V.), Koeleman, B.P.C. (Bobby), Gonidakis, F. (Fragiskos), Tziouvas, K. (Konstantinos), Tsitsika, A. (Artemis), Papezova, H. (Hana), Slachtova, L. (Lenka), Martaskova, D. (Debora), Kennedy, J.L., Levitan, R.D. (Robert D), Yilmaz, Z. (Zeynep), Huemer, J. (Julia), Koubek, D. (Doris), Merl, E. (Elisabeth), Wagner, G. (Gudrun), Lichtenstein, P. (Paul), Breen, G. (Gerome), Cohen-Woods, S. (Sarah), Farmer, A.E. (Anne E), Mcguffin, P. (Peter), Cichon, S. (Sven), Giegling, I. (Ina), Herms, S. (Stefan), Rujescu, D. (Dan), Schreiber, S. (Stefan), Wichmann, H.E. (Heinz Erich), Sladek, R. (Rob), Gambaro, G. (Giovanni), Soranzo, N. (Nicole), Julia, A. (Antonio), Marsal, S. (Sara), Rabionet, R. (Raquel), Gaborieau, V. (Valerie), Dick, D.M. (Danielle), Palotie, A. (A.), Ripatti, S. (Samuli), Widen, E., Espeseth, T. (Thomas), Lundervold, A.J. (Astri), Reinvang, I. (Ivar), Steen, V.M. (Vidar), Le Hellard, S. (Stephanie), Mattingsdal, M. (Morten), Ntalla, I. (Ioanna), Bencko, V. (Vladimir), Foretova, L. (Lenka), Janout, V. (Vladimir), Navratilova, M. (Marie), Pinto, D. (Dalila), Scherer, S.W. (Stephen W), Carlberg, L. (Laura), Schosser, A. (Alexandra), Alfredsson, L. (Lars), Pinto, D. (Duane), Scherer, S.W. (Stephen), Padyukov, L. (Leonid), Finan, C. (Chris), Kalsi, G. (Gursharan), Roberts, M. (Marion), Logan, D.W. (Darren W), Peltonen, L. (Leena Johanna), Ritchie, G.R.S. (Graham R.S.), Barrett, J.C. (Jeffrey), Estivill, X. (Xavier), Sullivan, P.F. (Patrick), Anderson, C.A. (Carl A), McGinnis, R. (Ralph), Sambrook, J. (Jennifer), Stephens, J. (Jonathan), Ouwehand, W.H. (Willem), McArdle, P.F. (P. F.), Ring, S.M. (Susan), Strachan, D.P. (David), Alexander, G. (Graeme), Conlon, P.J. (Peter J), Dominiczak, A. (Anna), Duncanson, A. (Audrey), Padyukov, L. (L.), Langford, C. (Cordelia), Lord, G. (Graham), Conlon, P. (Peter), Sandford, R. (Richard), Sheerin, N. (Neil), Vannberg, F.O. (Frederik O), Blackburn, H. (Hannah), Maxwell, A.P. (A.), Edkins, T. (Ted), Gillman, M.W. (Matthew W.), Gray, E. (Emma), Hunt, S.E. (Sarah E), Nengut, S.-G. (Suna-Gumuscu), Potter, S.C. (Simon), Rich, S.S. (Stephen), Simpkin, D. (Douglas), Whittaker, P. (Pamela), Ang, W.Q. (Wei), Atalay, M. (Mustafa), Beijsterveldt, C.E.M. (Toos) van, Bergen, N. (N.), Benke, K. (K.), Berry, D. (Diane), Boomsma, D.I. (Dorret), Bradfield, J.P. (Jonathan), Charoen, P. (Pimphen), Coin, L. (Lachlan), Cooper, C. (C.), Cousminer, D.L. (Diana), Das, S. (Shikta), Elliott, P. (P.), Evans, D.M. (D. M.), Feenstra, B. (B.), Flexeder, C. (Claudia), Frayling, T.M. (Timothy), Freathy, R.M. (Rachel), Gaillard, R. (R.), Geller, F. (Frank), Groen-Blokhuis, M. (Maria), Goh, L.K. (L. K.), Guxens Junyent, M. (Mònica), Hattersley, A.T. (Andrew), Haworth, C.M.A. (Claire M.), Hadley, D. (D.), Heinrich, J. (J.), Hirschhorn, J.N. (Joel), Hocher, B. (Berthold), Holloway, J.W. (J. W.), Holst, J.J., Hottenga, J.J. (Jouke Jan), Horikoshi, M. (Momoko), Huikari, V. (Ville), Hypponen, E. (E.), Iñiguez, C. (C.), Jaddoe, V.W. (V. W.), Jarvelin, M.R. (M. R.), Kaakinen, M. (M.), Kilpeläinen, T.O. (Tuomas), Hypponen, E. (Elina), Kowgier, M. (Matthew), Lakka, T.A. (Timo), Cooper, C. (Charles), Lange, L.A. (Leslie), Lawlor, D.A. (D. A.), Lehtimäki, T. (Terho), Lewin, A. (Alex), Elliott, P. (Paul), Lindi, V. (Virpi), Maggi, R. (Reedik), Feenstra, B. (Bjarke), McCarthy, M.I. (M. I.), Melbye, M. (Mads), Middeldorp, C.M. (Christel), Millwood, I.Y. (Iona), Mohlke, K.L. (Karen), Mook-Kanamori, D.O. (D. O.), Murray, J.C. (Jeffrey), Nivard, M. (Michel), Nohr, C. (Christian), Oken, E. (Emily), Ong, K.K. (K. K.), O'Reilly, P.F. (P. F.), Palmer, C. (Cameron), Panoutsopoulou, K. (K.), Pararajasingham, J. (Jennifer), Pearson, E.R. (E. R.), Pennell, C.E. (Craig), Power, C. (Christopher), Price, T.S. (Thomas), Prokopenko, I. (Inga), Raitakari, O.T. (O. T.), Rodriguez, A. (A.), Salem, R.M. (Rany), Saw, S.M. (S. M.), Sebert, S. (S.), Siitonen, N. (Niina), Jaddoe, V.W.V. (Vincent), Sørensen, T.I.A. (Thorkild), Sovio, U. (Ulla), Lawlor, D.A. (Debbie), Sunyer, J. (J.), Taal, H.R. (Rob), Teo, Y.Y. (Y. Y.), Thiering, E. (Elisabeth), Tiesler, C. (C.), Timpson, N.J. (Nicholas), Uitterlinden, A.G. (André), Valcárcel, B. (Beatriz), Teo, Y.Y. (Yik Ying), White, S.J. (Stefan), Willemsen, G.A.H.M. (Gonneke), Wilson, J.F. (J. F.), Yaghootkar, H. (H.), Elks, C.E. (Cathy), Perry, J.R. (J. R.), Sulem, P. (Patrick), Chasman, D.I. (Daniel), Franceschini, N. (Nora), He, C. (C.), Lunetta, K.L. (Kathryn), Visser, J.A. (Jenny), Byrne, E.M. (E. M.), Gudbjartsson, D.F. (Daniel), Koller, D.L. (Daniel), Kutalik, Z. (Zoltán), Lin, P. (P.), Mangino, M. (Massimo), Byrne, E.M. (Enda), Smith, A.V. (Albert), Stolk, L. (Lisette), Wingerden, S. (Sophie) van, Zhao, J.H. (J. H.), Albrecht, E. (Eva), Corre, T. (Tanguy), Ingelsson, E. (Erik), Hayward, C. (Caroline), Magnusson, P.K. (Patrik), Smith, A.V. (Davey), Chanock, S.J. (Stephen), Warrington, M. (M.), Zgaga, L. (L.), Alavere, H. (Helene), Amin, N. (Najaf), Aspelund, T. (T.), Ulivi, S. (Shelia), Sunyer, J. (Jordi), Berenson, G. (Gerald), Bergmann, S.M. (Sven), Boerwinkle, E. (E.), Buring, J.E. (Julie), Busonero, F. (F.), Barroso, I.E. (Inês), Chanock, S.J. (S. J.), Warrington, N.M. (Nicole), Couper, D.J. (David), Coviello, A.D. (Andrea), Busonero, F., Faire, U. (Ulf) de, de Geus, E.J. (E. J.), Deloukas, P. (Panagiotis), Döring, A. (Angela), Davey Smith, G. (G.), Adamo, P. (Pio) d', Eiriksdottir, G. (Gudny), Geus, E.J.C. (Eco) de, Hagen, K. (Knut), Ferrucci, L. (L.), Folsom, A.R. (A. R.), Foroud, T. (T.), Garcia, M.E. (M.), Gasparini, P. (P.), Gieger, C. (Christian), Gudnason, V. (V.), Folsom, A.R. (Aaron), Hankinson, S.E. (S. E.), Ferreli, L. (Liana), Gasparini, P. (Paolo), Hernandez, D.G. (Dena), Hofman, A. (Albert), Hu, F.B. (F. B.), Illig, T. (T.), Jarvelin, M.-R. (Marjo-Riitta), Johnson, A.D. (Andrew), Karasik, D. (David), Khaw, K.T. (K. T.), Kiel, D.P. (Douglas P.), Kolcic, I. (Ivana), Kraft, P. (Peter), Launer, L.J. (Lenore), Laven, J.S. (J. S.), Li, S. (S.), Liu, J. (J.), Levy, D. (D.), Martin, N.G. (N. G.), Aspelund, T. (Thor), Nalls, M.A. (Michael), Navarro, P. (Pau), Nelis, M. (M.), Ness, A.R. (A. R.), Boerwinkle, E.A. (Eric), Oostra, B.A. (Ben), Peacock, M. (M.), Pare, G. (Guillame), Parker, A.N. (Alex), Pedersen, N.L. (Nancy), Cornelis, M. (Marilyn), Polasek, O. (Ozren), Plump, A.S. (A. S.), Peacock, M. (Munro), Porcu, E. (Eleonora), Rafnar, T. (Thorunn), Rice, J.P. (John), Rivadeneira, F. (F.), Sala, C. (Cinzia), Salomaa, V. (Veikko), Sanna, S. (Serena), Schlessinger, D. (D.), Scuteri, A. (A.), Segrè, A.V. (Ayellet), Foroud, T. (Tatiana), Srinivasan, S.R. (Sathanur), Tammesoo, M.L. (M. L.), Tikkanen, E. (Emmi), Toniolo, D. (Daniela), Scuteri, A. (Angelo), Tryggvadottir, L. (Laufey), Tyrer, J. (J.), Uda, M. (M.), van Dam, R.M. (R. M.), Meurs, J.B.J. (Joyce) van, Vollenweider, P. (Peter), Waeber, G. (Gérard), Wareham, N.J. (Nick), Waterworth, D. (Dawn), Weedon, M.N. (Michael), Wright, A.F. (Alan), Young, L. (L.), Zhai, G. (G.), Zhuang, W.V. (W. V.), Bierut, L.J. (L. J.), Boyd, H.A. (H. A.), Crisponi, L. (Laura), Demerath, E.W. (E. W.), Duijn, C.M. (Cornelia) van, Econs, M.J. (M. J.), Harris, T.B. (Tamara), Bierut, L.J. (Laura), Loos, R.J.F. (Ruth), Ridker, P.M. (Paul), Demerath, E.W. (Ellen), Streeten, E.A. (Elizabeth), Econs, M.J. (Michael), Thorsteinsdottir, U. (Unnur), Widen, E. (E.), Murabito, J. (Joanne), Ness, A.R. (Andrew), Spector, T.D. (Timothy), Crawford, S. (Steve), Crow, S. (Scott), Fichter, M.M. (M. M.), Halmi, K.A. (K. A.), Palotie, A. (Aarno), La Via, M. (Maria), Mitchell, J. (James), Strober, M. (Michael), Rotondo, A. (Alessandro), Woodside, D.B. (D Blake), Keel, P. (Pamela), Lilenfeld, L. (Lisa), Rivadeneira Ramirez, F. (Fernando), Magistretti, P. (Pierre), and Montgomery, G.W. (G. W.)

Abstract

The maintenance of normal body weight is disrupted in patients with anorexia nervosa (AN) for prolonged periods of time. Prior to the onset of AN, premorbid body mass index (BMI) spans the entire range from underweight to obese. After recovery, patients have reduced rates of overweight and obesity. As such, loci involved in body weight regulation may also be relevant for AN and vice versa. Our primary analysis comprised a cross-trait analysis of the 1000 single-nucleotide polymorphisms (SNPs) with the lowest P-values in a genome-wide association meta-analysis (GWAMA) of AN (GCAN) for evidence of association in the largest published GWAMA for BMI (GIANT). Subsequently we performed sex-stratified analyses for these 1000 SNPs. Functional ex vivo studies on four genes ensued. Lastly, a look-up of GWAMA-derived BMI-related loci was performed in the AN GWAMA. We detected significant associations (P-values <5 × 10-5, Bonferroni-corrected P<0.05) for nine SNP alleles at three independent loci. Interestingly, all AN susceptibility alleles were consistently associated with increased BMI. None of the genes (chr. 10: CTBP2, chr. 19: CCNE1, chr. 2: CARF and NBEAL1; the latter is a region with high linkage disequilibrium) nearest to these SNPs has previously been associated with AN or obesity. Sex-stratified analyses revealed that the strongest BMI signal originated predominantly from females (chr. 10 rs1561589; Poverall: 2.47 × 10-06/Pfemales: 3.45 × 10-07/Pmales: 0.043). Functional ex vivo studies in mice revealed reduced hypothalamic expression of Ctbp2 and Nbeal1 after fasting. Hypothalamic expression of Ctbp2 was increased in diet-induced obese (DIO) mice as compared with age-matched lean controls. We observed no evidence for associations for the look-up of BMI-related loci in the AN GWAMA. A cross-trait analysis of AN and BMI loci revealed variants at three chromosomal loci with potential joint impact. The chromosome 10 locus is particularly promising given that the associa

Published
2017
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16. Machine learning dissected

Author

Jagesar, R.R., Spruit, M.R. (Thesis Advisor), Brinkkemper, S., Kas, M.J.H., Vorstman, J.A.S., Jagesar, R.R., Spruit, M.R. (Thesis Advisor), Brinkkemper, S., Kas, M.J.H., and Vorstman, J.A.S.

Abstract

The research presented in this thesis addresses machine learning techniques and their application in the context of classification problems. Furthermore as this thesis is centered around a medical initiative (Behapp) the insights found were applied to the data produced by this initiative. The direction of study on general machine learning techniques was chosen in order to model the knowledge on how to create optimized machine learning models. Furthermore, since it concerns the analysis of a medical data set the usage of transparent modeling techniques is prefered allowing us to relate the input (data) to the output (classification). This relates back to the goal of creating optimized models since transparent techniques are known to be outperformed by their non transparent counterparts. Using the modeling approach by Weerd and Brinkkemper (2008) the machine learning techniques were modelled into a method in the form of a process-deliverable-diagram. The method was then applied to two datasets to evaluate the potential for improvements in performance. We found that models generated using our method showed increased performance in terms of classification accuracy and overall reliability of the results. Next we applied transparent modeling techniques and the sociability scoring model (Eskes et al., 2016) to the data of the Behapp initiative. As expected, the in-depth look reveals various patterns where patients and controls are separated in the data. In light of the results we feel that the method created enables further reasoning on the application of machine learning techniques in a single procedural data mining approach and may be extended to include procedures relevant to other domains. Last we find that the concept of an aggregated sociability score shows promise in expressive value having applied it to patient data for the first time.

Published
2016

17. A genome-wide association study of anorexia nervosa

Author

Boraska, V. Franklin, C.S. Floyd, J.A.B. Thornton, L.M. Huckins, L.M. Southam, L. Rayner, N.W. Tachmazidou, I. Klump, K.L. Treasure, J. Lewis, C.M. Schmidt, U. Tozzi, F. Kiezebrink, K. Hebebrand, J. Gorwood, P. Adan, R.A.H. Kas, M.J.H. Favaro, A. Santonastaso, P. Fernández-Aranda, F. Gratacos, M. Rybakowski, F. Dmitrzak-Weglarz, M. Kaprio, J. Keski-Rahkonen, A. Raevuori, A. Van Furth, E.F. Slof-Op 't Landt, M.C.T. Hudson, J.I. Reichborn-Kjennerud, T. Knudsen, G.P.S. Monteleone, P. Kaplan, A.S. Karwautz, A. Hakonarson, H. Berrettini, W.H. Guo, Y. Li, D. Schork, N.J. Komaki, G. Ando, T. Inoko, H. Esko, T. Fischer, K. Männik, K. Metspalu, A. Baker, J.H. Cone, R.D. Dackor, J. DeSocio, J.E. Hilliard, C.E. O'Toole, J.K. Pantel, J. Szatkiewicz, J.P. Taico, C. Zerwas, S. Trace, S.E. Davis, O.S.P. Helder, S. Bühren, K. Burghardt, R. De Zwaan, M. Egberts, K. Ehrlich, S. Herpertz-Dahlmann, B. Herzog, W. Imgart, H. Scherag, A. Scherag, S. Zipfel, S. Boni, C. Ramoz, N. Versini, A. Brandys, M.K. Danner, U.N. De Kovel, C. Hendriks, J. Koeleman, B.P.C. Ophoff, R.A. Strengman, E. Van Elburg, A.A. Bruson, A. Clementi, M. Degortes, D. Forzan, M. Tenconi, E. Docampo, E. Escaramís, G. Jiménez-Murcia, S. Lissowska, J. Rajewski, A. Szeszenia-Dabrowska, N. Slopien, A. Hauser, J. Karhunen, L. Meulenbelt, I. Slagboom, P.E. Tortorella, A. Maj, M. Dedoussis, G. Dikeos, D. Gonidakis, F. Tziouvas, K. Tsitsika, A. Papezova, H. Slachtova, L. Martaskova, D. Kennedy, J.L. Levitan, R.D. Yilmaz, Z. Huemer, J. Koubek, D. Merl, E. Wagner, G. Lichtenstein, P. Breen, G. Cohen-Woods, S. Farmer, A. McGuffin, P. Cichon, S. Giegling, I. Herms, S. Rujescu, D. Schreiber, S. Wichmann, H.-E. Dina, C. Sladek, R. Gambaro, G. Soranzo, N. Julia, A. Marsal, S. Rabionet, R. Gaborieau, V. Dick, D.M. Palotie, A. Ripatti, S. Widén, E. Andreassen, O.A. Espeseth, T. Lundervold, A. Reinvang, I. Steen, V.M. Le Hellard, S. Mattingsdal, M. Ntalla, I. Bencko, V. Foretova, L. Janout, V. Navratilova, M. Gallinger, S. Pinto, D. Scherer, S.W. Aschauer, H. Carlberg, L. Schosser, A. Alfredsson, L. Ding, B. Klareskog, L. Padyukov, L. Courtet, P. Guillaume, S. Jaussent, I. Finan, C. Kalsi, G. Roberts, M. Logan, D.W. Peltonen, L. Ritchie, G.R.S. Barrett, J.C. Anderson, C.A. McGinnis, R. Zeggini, E. Sambrook, J. Stephens, J. Ouwehand, W.H. McArdle, W.L. Ring, S.M. Strachan, D.P. Alexander, G. Bulik, C.M. Collier, D.A. Conlon, P.J. Dominiczak, A. Duncanson, A. Hill, A. Langford, C. Lord, G. Maxwell, A.P. Morgan, L. Sandford, R.N. Sheerin, N. Vannberg, F.O. Blackburn, H. Chen, W.-M. Edkins, S. Gillman, M. Gray, E. Hunt, S.E. Onengut-Gumuscu, S. Potter, S. Rich, S.S. Simpkin, D. Whittaker, P. Estivill, X. Hinney, A. Sullivan, P.F. The Wellcome Trust Case Control Consortium 3

Abstract

Anorexia nervosa (AN) is a complex and heritable eating disorder characterized by dangerously low body weight. Neither candidate gene studies nor an initial genome-wide association study (GWAS) have yielded significant and replicated results. We performed a GWAS in 2907 cases with AN from 14 countries (15 sites) and 14 860 ancestrally matched controls as part of the Genetic Consortium for AN (GCAN) and the Wellcome Trust Case Control Consortium 3 (WTCCC3). Individual association analyses were conducted in each stratum and meta-analyzed across all 15 discovery data sets. Seventy-six (72 independent) single nucleotide polymorphisms were taken forward for in silico (two data sets) or de novo (13 data sets) replication genotyping in 2677 independent AN cases and 8629 European ancestry controls along with 458 AN cases and 421 controls from Japan. The final global meta-analysis across discovery and replication data sets comprised 5551 AN cases and 21 080 controls. AN subtype analyses (1606 AN restricting; 1445 AN binge-purge) were performed. No findings reached genome-wide significance. Two intronic variants were suggestively associated: rs9839776 (P = 3.01 × 10-7) in SOX2OT and rs17030795 (P = 5.84 × 10-6) in PPP3CA. Two additional signals were specific to Europeans: rs1523921 (P = 5.76 × 10-6) between CUL3 and FAM124B and rs1886797 (P = 8.05 × 10-6) near SPATA13. Comparing discovery with replication results, 76% of the effects were in the same direction, an observation highly unlikely to be due to chance (P = 4 × 10-6), strongly suggesting that true findings exist but our sample, the largest yet reported, was underpowered for their detection. The accrual of large genotyped AN case-control samples should be an immediate priority for the field. © 2014 Macmillan Publishers Limited All rights reserved.

Published
2014

18. Using ancestry-informative markers to identify fine structure across 15 populations of European origin

Author

Huckins, L.M. Boraska, V. Franklin, C.S. Floyd, J.A.B. Southam, L. Sullivan, P.F. Bulik, C.M. Collier, D.A. Tyler-Smith, C. Zeggini, E. Tachmazidou, I. Thornton, L.M. William Rayner, N. Klump, K.L. Treasure, J. Schmidt, U. Tozzi, F. Kiezebrink, K. Hebebrand, J. Gorwood, P. Adan, R.A.H. Kas, M.J.H. Favaro, A. Santonastaso, P. Fernández-Aranda, F. Gratacos, M. Rybakowski, F. Dmitrzak-Weglarz, M. Kaprio, J. Keski-Rahkonen, A. Raevuori, A. Van Furth, E.F. Slof-Op t Landt, M.C.T. Hudson, J.I. Reichborn-Kjennerud, T. Knudsen, G.P.S. Monteleone, P. Kaplan, A.S. Karwautz, A. Hakonarson, H. Berrettini, W.H. Guo, Y. Li, D. Schork, N.J. Komaki, G. Ando, T. Inoko, H. Esko, T. Fischer, K. Männik, K. Metspalu, A. Baker, J.H. Cone, R.D. Dackor, J. DeSocio, J.E. Hilliard, C.E. O'Toole, J.K. Pantel, J. Szatkiewicz, J.P. Taico, C. Zerwas, S. Trace, S.E. Davis, O.S.P. Helder, S. Bühren, K. Burghardt, R. de Zwaan, M. Egberts, K. Ehrlich, S. Herpertz-Dahlmann, B. Herzog, W. Imgart, H. Scherag, S. Zipfel, S. Boni, C. Ramoz, N. Versini, A. Brandys, M.K. Danner, U.N. de Kovel, C. Hendriks, J. Koeleman, B.P.C. Ophoff, R.A. Strengman, E. van Elburg, A.A. Bruson, A. Clementi, M. Degortes, D. Forzan, M. Tenconi, E. Docampo, E. Escaramís, G. Jiménez-Murcia, S. Lissowska, J. Rajewski, A. Szeszenia-Dabrowska, N. Slopien, A. Hauser, J. Karhunen, L. Meulenbelt, I. Slagboom, P.E. Tortorella, A. Maj, M. Dedoussis, G. Dikeos, D. Gonidakis, F. Tziouvas, K. Tsitsika, A. Papezova, H. Slachtova, L. Martaskova, D. Kennedy, J.L. Levitan, R.D. Yilmaz, Z. Huemer, J. Koubek, D. Merl, E. Wagner, G. Lichtenstein, P. Breen, G. Cohen-Woods, S. Farmer, A. McGuffin, P. Cichon, S. Giegling, I. Herms, S. Rujescu, D. Schreiber, S. Wichmann, H.-E. Dina, C. Sladek, R. Gambaro, G. Soranzo, N. Julia, A. Marsal, S. Rabionet, R. Gaborieau, V. Dick, D.M. Palotie, A. Ripatti, S. Widén, E. Andreassen, O.A. Espeseth, T. Lundervold, A. Reinvang, I. Steen, V.M. Le Hellard, S. Mattingsdal, M. Ntalla, I. Bencko, V. Foretova, L. Janout, V. Navratilova, M. Gallinger, S. Pinto, D. Scherer, S.W. Aschauer, H. Carlberg, L. Schosser, A. Alfredsson, L. Ding, B. Klareskog, L. Padyukov, L. Finan, C. Kalsi, G. Roberts, M. Logan, D.W. Peltonen, L. Ritchie, G.R.S. Courtet, P. Guillame, S. Jaussent, I. Barrett, J.C. Estivill, X. Hinney, A. Bulik, C.M. McGinnis, R. Sambrook, J. Stephens, J. Ouwehand, W.H. McArdle, W.L. Ring, S.M. Strachan, D.P. Alexander, G. Conlon, P.J. Dominiczak, A. Anderson, C.A. Hill, A. Langford, C. Lord, G. Maxwell, A.P. Morgan, L. Sandford, R.N. Sheerin, N. Vannberg, F.O. Blackburn, H. Chen, W.-M. Edkins, S. Gillman, M. Gray, E. Hunt, S.E. Onengut-Gumuscu, S. Potter, S. Rich, S.S. Simpkin, D. Whittaker, P.

Abstract

The Wellcome Trust Case Control Consortium 3 anorexia nervosa genome-wide association scan includes 2907 cases from 15 different populations of European origin genotyped on the Illumina 670K chip. We compared methods for identifying population stratification, and suggest list of markers that may help to counter this problem. It is usual to identify population structure in such studies using only common variants with minor allele frequency (MAF) >5%; we find that this may result in highly informative SNPs being discarded, and suggest that instead all SNPs with MAF >1% may be used. We established informative axes of variation identified via principal component analysis and highlight important features of the genetic structure of diverse European-descent populations, some studied for the first time at this scale. Finally, we investigated the substructure within each of these 15 populations and identified SNPs that help capture hidden stratification. This work can provide information regarding the designing and interpretation of association results in the International Consortia. © 2014 Macmillan Publishers Limited All rights reserved.

Published
2014

19. Cross-species genetics converge to TLL2 for mouse avoidance behavior and human bipolar disorder

Author

de Mooij - van Malsen, J.G., van Lith, H.A., Laarakker, M.C., Brandys, M., Oppelaar, H., Collier, D.A., Olivier, B., Breen, G., Kas, M.J.H., Emotion and Cognition, Psychopharmacology, Dep of Animals in Science and Society, and Sub BasicPharmacology&Psychopharmacology

Subjects
Geneeskunde (GENK), Bescherming en bevordering van de menselijke gezondheid, Geneeskunde(GENK), Medical sciences, General [Econometric and Statistical Methods]
Published
2013

20. Mapping an X-linked locus that influences heat-induced febrile seizures in mice

Author

Hessel, E.V.S., van Lith, H.A., Wolterink-Donselaar, I.G., de Wit, M., Hendrickx, D.A.E., Kas, M.J.H., de Graan, P.N.E., Emotion and Cognition, and Dep of Animals in Science and Society

Subjects
Econometric and Statistical Methods: General, International (English), Geneeskunde (GENK), Bescherming en bevordering van de menselijke gezondheid, Geneeskunde(GENK), Medical sciences
Published
2012

22. Identification of Srp9 as a febrile seizure susceptibility gene

Author

Hessel, E.V.S. (Ellen V. S.), de Wit, M. (Marina), Wolterink-Donselaar, I.G. (Inge G.), Karst, H., de Graaff, E. (Esther), Lith, H.A. (H.) van, de Bruijn, E. (Ewart), de Sonnaville, S. (Sophietje), Verbeek, N.E. (Nienke), Lindhout, D. (Dick), de Kovel, C.G.F. (Carolien G. F.), Koeleman, B.P.C. (Bobby), Kempen, M.J.A. (M. J A) van, Brilstra, E. (Eva), Cuppen, E. (Edwin), Loos, M. (Maarten), Spijker, S., Kan, A.A. (Anne A.), Baars, S.E. (Susanne E.), Rijen, P.C. (Peter) van, Gosselaar, P.H. (Peter H.), Groot Koerkamp, M.J.A. (Marian J. A.), Holstege, F.C.P. (Frank), Duijn, C.M. (Cornelia) van, Vergeer, J.M. (Jeanette), Moll, H.A. (Henriette A.), Taubøll, E. (Erik), Heuser, K. (Kjell), Ramakers, G.M.J. (Geert M. J.), Pasterkamp, R.J. (Jeroen), Nieuwenhuizen, O. (Onno) van, Hoogenraad, C.C. (Casper), Kas, M.J.H. (Martien), Graan, P.N.E. (Pierre) de, Hessel, E.V.S. (Ellen V. S.), de Wit, M. (Marina), Wolterink-Donselaar, I.G. (Inge G.), Karst, H., de Graaff, E. (Esther), Lith, H.A. (H.) van, de Bruijn, E. (Ewart), de Sonnaville, S. (Sophietje), Verbeek, N.E. (Nienke), Lindhout, D. (Dick), de Kovel, C.G.F. (Carolien G. F.), Koeleman, B.P.C. (Bobby), Kempen, M.J.A. (M. J A) van, Brilstra, E. (Eva), Cuppen, E. (Edwin), Loos, M. (Maarten), Spijker, S., Kan, A.A. (Anne A.), Baars, S.E. (Susanne E.), Rijen, P.C. (Peter) van, Gosselaar, P.H. (Peter H.), Groot Koerkamp, M.J.A. (Marian J. A.), Holstege, F.C.P. (Frank), Duijn, C.M. (Cornelia) van, Vergeer, J.M. (Jeanette), Moll, H.A. (Henriette A.), Taubøll, E. (Erik), Heuser, K. (Kjell), Ramakers, G.M.J. (Geert M. J.), Pasterkamp, R.J. (Jeroen), Nieuwenhuizen, O. (Onno) van, Hoogenraad, C.C. (Casper), Kas, M.J.H. (Martien), and Graan, P.N.E. (Pierre) de

Abstract

Objective: Febrile seizures (FS) are the most common seizure type in young children. Complex FS are a risk factor for mesial temporal lobe epilepsy (mTLE). To identify new FS susceptibility genes we used a forward genetic strategy in mice and subsequently analyzed candidate genes in humans. Methods: We mapped a quantitative trait locus (QTL1) for hyperthermia-induced FS on mouse chromosome 1, containing the signal recognition particle 9 (Srp9) gene. Effects of differential Srp9 expression were assessed in vivo and in vitro. Hippocampal SRP9 expression and genetic association were analyzed in FS and mTLE patients. Results: Srp9 was differentially expressed between parental strains C57BL/6J and A/J. Chromosome substitution strain 1 (CSS1) mice exhibited lower FS susceptibility and Srp9 expression than C57BL/6J mice. In vivo knockdown of brain Srp9 reduced FS susceptibility. Mice with reduced Srp9 expression and FS susceptibility, exhibited reduced hippocampal AMPA and NMDA currents. Downregulation of neuronal Srp9 reduced surface expression of AMPA receptor subunit GluA1. mTLE patients with antecedent FS had higher SRP9 expression than patients without. SRP9 promoter SNP rs12403575(G/A) was genetically associated with FS and mTLE. Interpretation: Our findings identify SRP9 as a novel FS susceptibility gene and indicate that SRP9 conveys its effects through endoplasmic reticulum (ER)-dependent synthesis and trafficking of membrane proteins, such as glutamate receptors. Discovery of this new FS gene and mechanism may provide new leads for early diagnosis and treatment of children with complex FS at risk for mTLE.

Published
2014
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23. Assessing behavioural and cognitive domains of autism spectrum disorders in rodents: current status and future perspectives

Author

Animal Ecology, Sub Animal Ecology, Kas, M.J.H., Glennon, J., Buitelaar, J.K., Ey, E., Biemans, B., Crawley, J.N., Ring, R.H., Lajonchere, C., Esclassan, F., Talpos, J., Noldus, L.P.J.J., Burbach, J.P.H., Steckler, T., Animal Ecology, Sub Animal Ecology, Kas, M.J.H., Glennon, J., Buitelaar, J.K., Ey, E., Biemans, B., Crawley, J.N., Ring, R.H., Lajonchere, C., Esclassan, F., Talpos, J., Noldus, L.P.J.J., Burbach, J.P.H., and Steckler, T.

Published
2014

34. AgRP(83—132) and SHU9119 differently affect activity-based anorexia

Author

Kas, M.J.H., Hillebrand, J.J.G., Scheurink, A.J.W., Adan, R.A.H., and Dijk, G. van

Subjects
Geneeskunde, organic chemicals, fungi, digestive, oral, and skin physiology, food and beverages, running wheel, food restriction, hormones, hormone substitutes, and hormone antagonists, melanocortins, hyperactivity
Abstract

Activity-based anorexia (ABA) mimics starvation and hyperactivity of anorexia nervosa patients in rats. Activation of the melanocortin (MC) system leads to hypophagia and increased energy expenditure in ad libitum fed rats. Therefore, activation of the MC system might underlie the development and propagation of ABA. Pro-opiomelanocortin (POMC) gene expression is normally decreased during negative energy balance. Strikingly, we found a transient up-regulation of POMC mRNA levels in the arcuate nucleus during the development of ABA, indicating a hyperactive MC system. However, wheel running and food intake were not influenced by treating ABA rats with the competitive antagonist SHU9119. This suggests that agonism of MC receptors by endogenous a-melanocyte-stimulating hormone (a-MSH) levels does not underlie ABA. Instead, treatment with the inverse agonist AgRP(83—132) did ameliorate signs of ABA. This implies that modulation of constitutive MC receptor activity rather than antagonizing putative a-MSH release contributes to the development and propagation of ABA.

Published
2005

37. The role of the HTR1D gene in anorexia nervosa

Author

Woutersen, K., Kas, M.J.H. (Thesis Advisor), Woutersen, K., and Kas, M.J.H. (Thesis Advisor)

Abstract

Anorexia nervosa is an uncommon but very severe disease that leads to serious malnutrition sometimes resulting in death. Genetic research has found associations between SNPs in the HTR1D gene and anorexia nervosa. In the current paper, we investigate this relationship using a bottom-up approach. The HTR1D gene codes for the serotonin 1D (5-HT1D receptor) which has been found to be present in low abundance throughout the brain and can act as an auto- and heteroreceptor. Although many studies have shown that the hyperactivity of the serotonin system is involved in eating behaviour and anorexia nervosa, no direct evidence exists that supports the involvement of the 5-HT1D receptor. Nonetheless, ligands binding to the 5-HT1B and 5-HT1D receptor have shown to influence eating behaviour. We propose a model which states that abnormal expression of the 5-HT1D receptor in the raphe nuclei, hypothalamus and parabrachial nucleus leads to a preference of lower food intake. Eating more leads to anxiety and distress. Children with SNPs in the HTR1D gene may experience these symptoms without knowing how to deal with them. Once they have their first dieting experience their symptoms reduce due to decreased tryptophan (the precursor of serotonin) intake which leads to lower serotonin activity. Patients with anorexia nervosa may associate the reduction in symptoms with decreased food intake and therefore become reluctant to eat. At the moment, little direct evidence supporting our model exists. Therefore, further research is required and suggestions are given.

Published
2013

38. Cross-species genetics converge to TLL2 for mouse avoidance behavior and human bipolar disorder

Author

Emotion and Cognition, Psychopharmacology, Dep of Animals in Science and Society, Sub BasicPharmacology&Psychopharmacology, de Mooij - van Malsen, J.G., van Lith, H.A., Laarakker, M.C., Brandys, M., Oppelaar, H., Collier, D.A., Olivier, B., Breen, G., Kas, M.J.H., Emotion and Cognition, Psychopharmacology, Dep of Animals in Science and Society, Sub BasicPharmacology&Psychopharmacology, de Mooij - van Malsen, J.G., van Lith, H.A., Laarakker, M.C., Brandys, M., Oppelaar, H., Collier, D.A., Olivier, B., Breen, G., and Kas, M.J.H.

Published
2013

40. Mapping an X-linked locus that influences heat-induced febrile seizures in mice

Author

Emotion and Cognition, Dep of Animals in Science and Society, Hessel, E.V.S., van Lith, H.A., Wolterink-Donselaar, I.G., de Wit, M., Hendrickx, D.A.E., Kas, M.J.H., de Graan, P.N.E., Emotion and Cognition, Dep of Animals in Science and Society, Hessel, E.V.S., van Lith, H.A., Wolterink-Donselaar, I.G., de Wit, M., Hendrickx, D.A.E., Kas, M.J.H., and de Graan, P.N.E.

Published
2012

42. Cytoplasmic FMRP Interacting Protein 1 (CYFIP1) - A key player in the pathophysiology of the Fragile X Syndrome?

Author

Legerstee, K., Kas, M.J.H. (Thesis Advisor), Legerstee, K., and Kas, M.J.H. (Thesis Advisor)

Abstract

This literature study investigates the role Cyfip1 could play in the pathophysiology of the Fragile X Syndrome (FXS). FXS, the most common form of mental retardation, is caused by disruptions to the Fmr1 gene. In all cases except one FXS is caused by a loss of expression of the protein encoded for by Fmr1, FMRP, most commonly due to a CGG-repeat expansion resulting in excessive methylation of FMRP. In the single exception a point mutation in the FMR1 gene specifically impairs the ability of FMRP to associate with polyribosomes, while leaving its ability to bind (m)RNA molecules in vivo intact (De Boulle et al., 1993; Feng et al., 1997a; Siomi et al.,1994). It results in an especially severe form of FXS. Suggesting that, although FMRP has a number of different functions in cells it is its role in the regulation of (local) mRNA translation as a binding partner of polyribosomes, mainly repressing the translation of its target mRNAs, that is crucial to the pathophysiology of FXS (Laggerbauer et al., 2001; Lu et al., 2004). As a mechanistic explanation of the pathophysiology of FXS the ‘mGluR theory of fragile X’ is most commonly accepted (Bear et al., 2004).It also points to the role of FMRP in the regulation of local mRNA translation as critical for the pathophysiology of FXS. According to this theory the activation of group 1 metabotropic glutamate receptors (mGluRs) at dendrites stimulates the local translation of mRNAs that are responsible for the functional effects of mGluR-signalling as well as of FMRP. The FMRP inhibits the further local translation of these mRNAs, serving as a form of end-product inhibition for the mGluR-signalling. In the absence of FMRP, as in FXS, the inhibition by FMRP falls away leading to an exaggeration of all local protein synthesis-dependent effects of mGluR-signalling, proposed to be the underlying cause of the diverse symptoms of FXS. The Fmr1 knockout mouse model of FXS displays a multifaceted phenotype that is generally consist with

Published
2011

43. Adenylyl Cyclase and Anxiety in Bipolar Disorder In the search for a specific treatment target for bipolar disorder

Author

Kuijpers, M., Kas, M.J.H. (Thesis Advisor), Kuijpers, M., and Kas, M.J.H. (Thesis Advisor)

Abstract

Bipolar disorder (BPD), also known as manic depressive illness, is a complex brain disorder common under adults as well as adolescents. Patients with BPD disorder suffer from dramatic mood swings, which severely hamper a patient’s life. Symptoms vary from hyperactivity and psychosis during mania to self-deprecatory and anxious behaviour during depression. These contrasting symptoms hinder the search for a cause and treatment for BPD. Currently used medicines are often anti-depressants with many unwanted side effects, and of which the exact working mechanism are unclear. Therefore, there is a need for a specific treatment for BPD. Recent studies with knockout mice pointed at the enzyme adenylyl cyclase subtype 8 as potential treatment target for BPD, but further research has to confirm this. In this thesis, the potential of different adenylyl cyclase subtypes as treatment targets for BPD is studied. This is approached by studying the BPD symptoms and their underlying molecular mechanisms, and by linking characteristics of adenylyl cyclase subtypes to BPD symptoms. These approaches lead to the finding that adenylyl cyclase subtype 1 and adenylyl cyclase subtype 8 play an important role in BPD pathology. This is shown by their role in neural growth and other neural processes, their expression in the cerebellum and hypothalamus, and their involvement in the hypothalamic-pituitary- adrenal -axis. In addition, AC8 is crucial for the generation of behavioural stress responses, and it induces anti-depressive or manic like behaviour. Furthermore, the findings in this thesis indicate a major amplifying role for anxiety in the development and course of BPD. Also anxiety generation involves AC1 and AC8, which supports the strong relation between anxiety and BPD. Taken together, these results point at anxiety, AC1 and AC8 as high potential treatment targets for BPD.

Published
2010

45. The Y of hYperactivitY in Anorexia Nervosa: Role of neuropeptide Y in hyperactivity associated with Anorexia Nervosa

Author

Achterberg, E.J.M., Kas, M.J.H. (Thesis Advisor), Achterberg, E.J.M., and Kas, M.J.H. (Thesis Advisor)

Abstract

Anorexia Nervosa is a dramatic neuro-psychiatric disorder characterized by severe selective restriction of food intake, hypophagia and hypothermia but also behavioral hyperactivity. Behavioral hyperactivity aggravates the already serious food-deprived state of anorexia patients, hinders body-weight gain and increases the probability of relapse; therefore, it is an important target in the treatment of anorexia nervosa. The activity-based-anorexia (ABA) model of anorexia and is extensively used to investigate the underlying neurobiological systems involved in hyperactivity. The hypothalamus is considered the major brain site for regulation energy metabolism, because it can assess the immediate energy state of the organism and consists of several nuclei. These different nuclei communicate with each other by using neurotransmitters and neuropeptides. One of these neuropeptides is neuropeptide Y (NPY); it is considered to most potent orexigenic neuropeptide known and it heavily innervates the hypothalamic nuclei. This neuropeptide increases feeding behavior, is upregulated in response to food-deprivation and acts via its abundant, centrally spread Y1, Y2 and Y5 receptors. In anorexia patients, high levels of NPY have been found, however, these patients do not eat. This phenomenon is termed the “NPY-paradox”. In addition, most of these anorexia patients display high levels of physical activity, despite their severe state of emaciation. The aim of this thesis was to investigate the potential role through which NPY contributes to hyperactivity associated with anorexia nervosa. First the possible underlying neurobiological systems involved in this behavior were described. Second, the existing hypotheses about function of hyperactivity in anorexia were described. These hypotheses include, the “foraging hypothesis”, the “hypothermia hypothesis” and the “reward hypothesis”. Furthermore, the possible role of NPY in these hypotheses was investigated with special attention to the

Published
2009

46. Interspecies Trait Genetics Reveals Association of Adcy8 with Mouse Avoidance Behavior and a Human Mood Disorder

Author

Dierexperimenteel, Emotion and Cognition, Dep of Animals in Science and Society, Dep Farmaceutische wetenschappen, de Mooij - van Malsen, J.G., van Lith, H.A., Oppelaar, H., Hendriks, J.C.J.M., de Wit, M., Kostrzewa, E., Breen, G., Collier, D.A., Olivier, B., Kas, M.J.H., Dierexperimenteel, Emotion and Cognition, Dep of Animals in Science and Society, Dep Farmaceutische wetenschappen, de Mooij - van Malsen, J.G., van Lith, H.A., Oppelaar, H., Hendriks, J.C.J.M., de Wit, M., Kostrzewa, E., Breen, G., Collier, D.A., Olivier, B., and Kas, M.J.H.

Published
2009

47. A grandparent-influenced locus for alcohol preference on mouse chromosome 2

Author

Emotion and Cognition, Dep of Animals in Science and Society, Lesscher, H.M.B., Kas, M.J.H., van der Elst, S., van Lith, H.A., Vanderschuren, L.J.M.J., Emotion and Cognition, Dep of Animals in Science and Society, Lesscher, H.M.B., Kas, M.J.H., van der Elst, S., van Lith, H.A., and Vanderschuren, L.J.M.J.

Published
2009

48. Evidence for epigenetic interactions for loci on mouse chromosome 1 regulating open field activity

Author

Dierexperimenteel, Emotion and Cognition, Dep of Animals in Science and Society, Dep Farmaceutische wetenschappen, de Mooij - van Malsen, J.G., van Lith, H.A., Oppelaar, H., Olivier, B., Kas, M.J.H., Dierexperimenteel, Emotion and Cognition, Dep of Animals in Science and Society, Dep Farmaceutische wetenschappen, de Mooij - van Malsen, J.G., van Lith, H.A., Oppelaar, H., Olivier, B., and Kas, M.J.H.

Published
2009

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