@article {8512, title = {Association of a Genetic Risk Score With Body Mass Index Across Different Birth Cohorts.}, journal = {JAMA}, volume = {316}, year = {2016}, month = {2016 Jul 05}, pages = {63-9}, chapter = {63}, abstract = {

IMPORTANCE: Many genetic variants are associated with body mass index (BMI). Associations may have changed with the 20th century obesity epidemic and may differ for black vs white individuals.

OBJECTIVE: Using birth cohort as an indicator for exposure to obesogenic environment, to evaluate whether genetic predisposition to higher BMI has a larger magnitude of association among adults from more recent birth cohorts, who were exposed to the obesity epidemic at younger ages.

DESIGN, SETTING, AND PARTICIPANTS: Observational study of 8788 adults in the US national Health and Retirement Study who were aged 50 years and older, born between 1900 and 1958, with as many as 12 BMI assessments from 1992 to 2014.

EXPOSURES: A multilocus genetic risk score for BMI (GRS-BMI), calculated as the weighted sum of alleles of 29 single nucleotide polymorphisms associated with BMI, with weights equal to the published per-allele effects. The GRS-BMI represents how much each person{\textquoteright}s BMI is expected to differ, based on genetic background (with respect to these 29 loci), from the BMI of a sample member with median genetic risk. The median-centered GRS-BMI ranged from -1.68 to 2.01.

MAIN OUTCOMES AND MEASURES: BMI based on self-reported height and weight.

RESULTS: GRS-BMI was significantly associated with BMI among white participants (n = 7482; mean age at first assessment, 59 years; 3373 [45\%] were men; P <.001) and among black participants (n = 1306; mean age at first assessment, 57 years; 505 [39\%] were men; P <.001) but accounted for 0.99\% of variation in BMI among white participants and 1.37\% among black participants. In multilevel models accounting for age, the magnitude of associations of GRS-BMI with BMI were larger for more recent birth cohorts. For example, among white participants, each unit higher GRS-BMI was associated with a difference in BMI of 1.37 (95\% CI, 0.93 to 1.80) if born after 1943, and 0.17 (95\% CI, -0.55 to 0.89) if born before 1924 (P = .006). For black participants, each unit higher GRS-BMI was associated with a difference in BMI of 3.70 (95\% CI, 2.42 to 4.97) if born after 1943, and 1.44 (95\% CI, -1.40 to 4.29) if born before 1924.

CONCLUSIONS AND RELEVANCE: For participants born between 1900 and 1958, the magnitude of association between BMI and a genetic risk score for BMI was larger among persons born in later cohorts. This suggests that associations of known genetic variants with BMI may be modified by obesogenic environments.

}, keywords = {African Continental Ancestry Group, Age Factors, Aged, Aged, 80 and over, Alleles, Body Mass Index, Cohort Studies, European Continental Ancestry Group, Female, Genetic Predisposition to Disease, Genetic Variation, Genome-Wide Association Study, Humans, Male, Middle Aged, Multilocus Sequence Typing, Obesity, Polymorphism, Single Nucleotide, Risk Factors, United States}, issn = {1538-3598}, doi = {10.1001/jama.2016.8729}, url = {http://www.ncbi.nlm.nih.gov/pubmed/27380344}, author = {Stefan Walter and Mej{\'\i}a-Guevara, Iv{\'a}n and Estrada, Karol and Sze Y Liu and M. Maria Glymour} } @article {8882, title = {Genetic studies of body mass index yield new insights for obesity biology.}, journal = {Nature}, volume = {518}, year = {2015}, month = {2015 Feb 12}, pages = {197-206}, abstract = {

Obesity is heritable and predisposes to many diseases. To understand the genetic basis of obesity better, here we conduct a genome-wide association study and Metabochip meta-analysis of body mass index (BMI), a measure commonly used to define obesity and assess adiposity, in up to 339,224 individuals. This analysis identifies 97 BMI-associated loci (P~<~5~{\texttimes}~10(-8)), 56 of which are novel. Five loci demonstrate clear evidence of several independent association signals, and many loci have significant effects on other metabolic phenotypes. The 97 loci account for \~{}2.7\% of BMI variation, and genome-wide estimates suggest that common variation accounts for >20\% of BMI variation. Pathway analyses provide strong support for a role of the central nervous system in obesity susceptibility and implicate new genes and pathways, including those related to synaptic function, glutamate signalling, insulin secretion/action, energy metabolism, lipid biology and adipogenesis.

}, keywords = {Age Factors, BMI, Continental Population Groups, Energy Metabolism, Europe, Female, Genome-Wide Association Study, Glutamic Acid, Humans, Insulin, Male, Obesity, Polymorphism, Single Nucleotide, Quantitative Trait Loci, Synapses}, issn = {1476-4687}, doi = {10.1038/nature14177}, author = {Locke, Adam E and Kahali, Bratati and Berndt, Sonja I and Justice, Anne E and Pers, Tune H and Day, Felix R and Powell, Corey and Vedantam, Sailaja and Buchkovich, Martin L and Yang, Jian and Croteau-Chonka, Damien C and T{\~o}nu Esko and Fall, Tove and Ferreira, Teresa and Gustafsson, Stefan and Kutalik, Zolt{\'a}n and Luan, Jian{\textquoteright}an and M{\"a}gi, Reedik and Randall, Joshua C and Thomas W Winkler and Andrew R Wood and Workalemahu, Tsegaselassie and Jessica Faul and Jennifer A Smith and Jing Hua Zhao and Wei Zhao and Chen, Jin and Rudolf Ferhmann and Hedman, {\r A}sa K and Karjalainen, Juha and Schmidt, Ellen M and Absher, Devin and Amin, Najaf and Anderson, Denise and Beekman, Marian and Bolton, Jennifer L and Bragg-Gresham, Jennifer L and Buyske, Steven and Demirkan, Ayse and Deng, Guohong and Georg B Ehret and Feenstra, Bjarke and Feitosa, Mary F and Fischer, Krista and Goel, Anuj and Gong, Jian and Jackson, Anne U and Kanoni, Stavroula and Kleber, Marcus E and Kristiansson, Kati and Lim, Unhee and Lotay, Vaneet and Mangino, Massimo and Irene Mateo Leach and Medina-Gomez, Carolina and Sarah E Medland and Michael A Nalls and Palmer, Cameron D and Pasko, Dorota and Pechlivanis, Sonali and Peters, Marjolein J and Prokopenko, Inga and Shungin, Dmitry and Stan{\v c}{\'a}kov{\'a}, Alena and Strawbridge, Rona J and Yun Ju Sung and Toshiko Tanaka and Teumer, Alexander and Trompet, Stella and van der Laan, Sander W and van Setten, Jessica and Jana V. van Vliet-Ostaptchouk and Wang, Zhaoming and Yengo, Loic and Zhang, Weihua and Isaacs, Aaron and Albrecht, Eva and {\"A}rnl{\"o}v, Johan and Arscott, Gillian M and Attwood, Antony P and Bandinelli, Stefania and Barrett, Amy and Bas, Isabelita N and Bellis, Claire and Bennett, Amanda J and Berne, Christian and Blagieva, Roza and Bl{\"u}her, Matthias and B{\"o}hringer, Stefan and Bonnycastle, Lori L and B{\"o}ttcher, Yvonne and Boyd, Heather A and Bruinenberg, Marcel and Caspersen, Ida H and Yii-Der I Chen and Robert Clark and Daw, E Warwick and de Craen, Anton J M and Delgado, Graciela and Dimitriou, Maria and Doney, Alex S F and Eklund, Niina and Estrada, Karol and Eury, Elodie and Folkersen, Lasse and Fraser, Ross M and Melissa E Garcia and Geller, Frank and Giedraitis, Vilmantas and Gigante, Bruna and Alan S Go and Golay, Alain and Goodall, Alison H and Gordon, Scott D and Gorski, Mathias and Hans-J{\"o}rgen Grabe and Grallert, Harald and Grammer, Tanja B and Gr{\"a}{\ss}ler, J{\"u}rgen and Gr{\"o}nberg, Henrik and Groves, Christopher J and Gusto, Ga{\"e}lle and Jeffrey Haessler and Hall, Per and Haller, Toomas and Hallmans, G{\"o}ran and Catharina A Hartman and Hassinen, Maija and Caroline Hayward and Heard-Costa, Nancy L and Helmer, Quinta and Hengstenberg, Christian and Oddgeir L Holmen and Jouke-Jan Hottenga and James, Alan L and Janina Jeff and Johansson, {\r A}sa and Jolley, Jennifer and Juliusdottir, Thorhildur and Kinnunen, Leena and Koenig, Wolfgang and Koskenvuo, Markku and Kratzer, Wolfgang and Laitinen, Jaana and Lamina, Claudia and Leander, Karin and Lee, Nanette R and Lichtner, Peter and Lars Lind and Lindstr{\"o}m, Jaana and Ken Sin Lo and Lobbens, St{\'e}phane and Lorbeer, Roberto and Lu, Yingchang and Mach, Fran{\c c}ois and Patrik K E Magnusson and Mahajan, Anubha and McArdle, Wendy L and McLachlan, Stela and Menni, Cristina and Merger, Sigrun and Mihailov, Evelin and Lili Milani and Moayyeri, Alireza and Monda, Keri L and Morken, Mario A and Mulas, Antonella and M{\"u}ller, Gabriele and M{\"u}ller-Nurasyid, Martina and Musk, Arthur W and Nagaraja, Ramaiah and Markus M N{\"o}then and Ilja M Nolte and Pilz, Stefan and Nigel W Rayner and Renstrom, Frida and Rettig, Rainer and Ried, Janina S and Ripke, Stephan and Neil R Robertson and Rose, Lynda M and Sanna, Serena and Scharnagl, Hubert and Scholtens, Salome and Schumacher, Fredrick R and Scott, William R and Seufferlein, Thomas and Jianxin Shi and Albert Vernon Smith and Smolonska, Joanna and Stanton, Alice V and Steinthorsdottir, Valgerdur and Kathleen E Stirrups and Heather M Stringham and Sundstr{\"o}m, Johan and Swertz, Morris A and Swift, Amy J and Syv{\"a}nen, Ann-Christine and Tan, Sian-Tsung and Bamidele O Tayo and Thorand, Barbara and Thorleifsson, Gudmar and Tyrer, Jonathan P and Uh, Hae-Won and Vandenput, Liesbeth and Verhulst, Frank C and Vermeulen, Sita H and Verweij, Niek and Vonk, Judith M and Lindsay L Waite and Warren, Helen R and Dawn M Waterworth and Michael N Weedon and Wilkens, Lynne R and Willenborg, Christina and Wilsgaard, Tom and Wojczynski, Mary K and Wong, Andrew and Alan F Wright and Zhang, Qunyuan and Brennan, Eoin P and Murim Choi and Dastani, Zari and Alexander W Drong and Eriksson, Per and Franco-Cereceda, Anders and G{\r a}din, Jesper R and Gharavi, Ali G and Goddard, Michael E and Handsaker, Robert E and Huang, Jinyan and Karpe, Fredrik and Kathiresan, Sekar and Keildson, Sarah and Kiryluk, Krzysztof and Kubo, Michiaki and Lee, Jong-Young and Liang, Liming and Lifton, Richard P and Ma, Baoshan and McCarroll, Steven A and McKnight, Amy J and Min, Josine L and Moffatt, Miriam F and Grant W Montgomery and Joanne M Murabito and Nicholson, George and Nyholt, Dale R and Okada, Yukinori and Perry, John R B and Dorajoo, Rajkumar and Reinmaa, Eva and Salem, Rany M and Sandholm, Niina and Scott, Robert A and Stolk, Lisette and Takahashi, Atsushi and Tanaka, Toshihiro and Ferdinand M van {\textquoteright}t Hooft and Anna A E Vinkhuyzen and Westra, Harm-Jan and Wei Zhang and Krina T Zondervan and Andrew C Heath and Arveiler, Dominique and Bakker, Stephan J L and Beilby, John and Bergman, Richard N and Blangero, John and Bovet, Pascal and Campbell, Harry and Caulfield, Mark J and Cesana, Giancarlo and Chakravarti, Aravinda and Daniel I Chasman and Chines, Peter S and Collins, Francis S and Crawford, Dana C and Cupples, L Adrienne and Cusi, Daniele and Danesh, John and de Faire, Ulf and Hester M den Ruijter and Dominiczak, Anna F and Erbel, Raimund and Erdmann, Jeanette and Johan G Eriksson and Farrall, Martin and Felix, Stephan B and Ferrannini, Ele and Ferri{\`e}res, Jean and Ford, Ian and Forouhi, Nita G and Forrester, Terrence and Franco, Oscar H and Gansevoort, Ron T and Gejman, Pablo V and Gieger, Christian and Gottesman, Omri and Gudnason, Vilmundur and Gyllensten, Ulf and Hall, Alistair S and Tamara B Harris and Andrew T Hattersley and Hicks, Andrew A and Hindorff, Lucia A and Aroon Hingorani and Hofman, Albert and Homuth, Georg and Hovingh, G Kees and Humphries, Steve E and Hunt, Steven C and Hypp{\"o}nen, Elina and Illig, Thomas and Jacobs, Kevin B and J{\"a}rvelin, Marjo-Riitta and J{\"o}ckel, Karl-Heinz and Johansen, Berit and Jousilahti, Pekka and Jukema, J Wouter and Jula, Antti M and Kaprio, Jaakko and Kastelein, John J P and Keinanen-Kiukaanniemi, Sirkka M and Lambertus A Kiemeney and Knekt, Paul and Kooner, Jaspal S and Charles Kooperberg and Kovacs, Peter and Kraja, Aldi T and Kumari, Meena and Kuusisto, Johanna and Lakka, Timo A and Langenberg, Claudia and Loic Le Marchand and Lehtim{\"a}ki, Terho and Lyssenko, Valeriya and M{\"a}nnist{\"o}, Satu and Marette, Andr{\'e} and Matise, Tara C and McKenzie, Colin A and McKnight, Barbara and Moll, Frans L and Morris, Andrew D and Morris, Andrew P and Murray, Jeffrey C and Nelis, Mari and Ohlsson, Claes and Oldehinkel, Albertine J and Ong, Ken K and Pamela A F Madden and Pasterkamp, Gerard and Peden, John F and Peters, Annette and Postma, Dirkje S and Pramstaller, Peter P and Price, Jackie F and Qi, Lu and Olli T Raitakari and Rankinen, Tuomo and Rao, D C and Rice, Treva K and Ridker, Paul M and Rioux, John D and Ritchie, Marylyn D and Rudan, Igor and Veikko Salomaa and Nilesh J Samani and Saramies, Jouko and Sarzynski, Mark A and Schunkert, Heribert and Schwarz, Peter E H and Peter Sever and Alan R Shuldiner and Sinisalo, Juha and Stolk, Ronald P and Strauch, Konstantin and T{\"o}njes, Anke and Tr{\'e}gou{\"e}t, David-Alexandre and Tremblay, Angelo and Tremoli, Elena and Virtamo, Jarmo and Vohl, Marie-Claude and V{\"o}lker, Uwe and Waeber, G{\'e}rard and Gonneke Willemsen and Witteman, Jacqueline C and Zillikens, M Carola and Adair, Linda S and Amouyel, Philippe and Asselbergs, Folkert W and Assimes, Themistocles L and Bochud, Murielle and Boehm, Bernhard O and Boerwinkle, Eric and Bornstein, Stefan R and Erwin P Bottinger and Bouchard, Claude and Cauchi, St{\'e}phane and Chambers, John C and Chanock, Stephen J and Cooper, Richard S and de Bakker, Paul I W and George Dedoussis and Luigi Ferrucci and Franks, Paul W and Froguel, Philippe and Leif C Groop and Christopher A Haiman and Hamsten, Anders and Hui, Jennie and Hunter, David J and Hveem, Kristian and Kaplan, Robert C and Mika Kivim{\"a}ki and Kuh, Diana and Laakso, Markku and Yongmei Liu and Nicholas G Martin and M{\"a}rz, Winfried and Melbye, Mads and Andres Metspalu and Moebus, Susanne and Munroe, Patricia B and Nj{\o}lstad, Inger and Ben A Oostra and Palmer, Colin N A and Nancy L Pedersen and Markus Perola and P{\'e}russe, Louis and Peters, Ulrike and Power, Chris and Quertermous, Thomas and Rauramaa, Rainer and Fernando Rivadeneira and Saaristo, Timo E and Saleheen, Danish and Sattar, Naveed and Eric E Schadt and Schlessinger, David and Eline P Slagboom and Snieder, Harold and Timothy Spector and Thorsteinsdottir, Unnur and Stumvoll, Michael and Tuomilehto, Jaakko and Andr{\'e} G Uitterlinden and Uusitupa, Matti and van der Harst, Pim and Walker, Mark and Wallaschofski, Henri and Wareham, Nicholas J and Watkins, Hugh and David R Weir and Wichmann, H-Erich and James F Wilson and Zanen, Pieter and Ingrid B Borecki and Deloukas, Panos and Caroline S Fox and Iris M Heid and Jeff O{\textquoteright}Connell and David P Strachan and Stefansson, Kari and Cornelia M van Duijn and Gon{\c c}alo R Abecasis and Lude L Franke and Timothy M Frayling and McCarthy, Mark I and Peter M Visscher and Scherag, Andre and Willer, Cristen J and Boehnke, Michael and Mohlke, Karen L and Lindgren, Cecilia M and Beckmann, Jacques S and Barroso, In{\^e}s and Kari E North and Ingelsson, Erik and Joel N Hirschhron and Ruth J F Loos and Elizabeth K Speliotes} }