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dc.contributor.authorGILL, MICHAELen
dc.contributor.authorGILL, MICHAELen
dc.date.accessioned2015-09-16T15:31:36Z
dc.date.available2015-09-16T15:31:36Z
dc.date.issued2015en
dc.date.submitted2015en
dc.identifier.citationHung CF, Breen G, Czamara D, Corre T, Wolf C, Kloiber S, Bergmann S, Craddock N, Gill M, Holsboer F, Jones L, Jones I, Korszun A, Kutalik Z, Lucae S, Maier W, Mors O, Owen MJ, Rice J, Rietschel M, Uher R, Vollenweider P, Waeber G, Craig IW, Farmer AE, Lewis CM, Müller-Myhsok B, Preisig M, McGuffin P, Rivera M, A genetic risk score combining 32 SNPs is associated with body mass index and improves obesity prediction in people with major depressive disorder., BMC medicine, 13, 2015, 86en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/74582
dc.descriptionPUBLISHEDen
dc.description.abstractBackground Obesity is strongly associated with major depressive disorder (MDD) and various other diseases. Genome-wide association studies have identified multiple risk loci robustly associated with body mass index (BMI). In this study, we aimed to investigate whether a genetic risk score (GRS) combining multiple BMI risk loci might have utility in prediction of obesity in patients with MDD. Methods Linear and logistic regression models were conducted to predict BMI and obesity, respectively, in three independent large case–control studies of major depression (Radiant, GSK-Munich, PsyCoLaus). The analyses were first performed in the whole sample and then separately in depressed cases and controls. An unweighted GRS was calculated by summation of the number of risk alleles. A weighted GRS was calculated as the sum of risk alleles at each locus multiplied by their effect sizes. Receiver operating characteristic (ROC) analysis was used to compare the discriminatory ability of predictors of obesity. Results In the discovery phase, a total of 2,521 participants (1,895 depressed patients and 626 controls) were included from the Radiant study. Both unweighted and weighted GRS were highly associated with BMI (P <0.001) but explained only a modest amount of variance. Adding ‘traditional’ risk factors to GRS significantly improved the predictive ability with the area under the curve (AUC) in the ROC analysis, increasing from 0.58 to 0.66 (95% CI, 0.62–0.68; χ2 = 27.68; P <0.0001). Although there was no formal evidence of interaction between depression status and GRS, there was further improvement in AUC in the ROC analysis when depression status was added to the model (AUC = 0.71; 95% CI, 0.68–0.73; χ2 = 28.64; P <0.0001). We further found that the GRS accounted for more variance of BMI in depressed patients than in healthy controls. Again, GRS discriminated obesity better in depressed patients compared to healthy controls. We later replicated these analyses in two independent samples (GSK-Munich and PsyCoLaus) and found similar results. Conclusions A GRS proved to be a highly significant predictor of obesity in people with MDD but accounted for only modest amount of variance. Nevertheless, as more risk loci are identified, combining a GRS approach with information on non-genetic risk factors could become a useful strategy in identifying MDD patients at higher risk of developing obesity.en
dc.format.extent86en
dc.relation.ispartofseriesBMC medicineen
dc.relation.ispartofseries13en
dc.rightsYen
dc.subjectObesityen
dc.subjectMajor depressive disorderen
dc.subjectGenetic risk scoreen
dc.subjectBody mass indexen
dc.titleA genetic risk score combining 32 SNPs is associated with body mass index and improves obesity prediction in people with major depressive disorder.en
dc.typeJournal Articleen
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/mgillen
dc.identifier.rssinternalid106251en
dc.identifier.doi10.1186/s12916-015-0334-3en
dc.rights.ecaccessrightsopenAccess


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