Synergistic effects of childhood adversity and polygenic risk in first-episode psychosis: the EU-GEI study
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Citações na Scopus
8
Tipo de produção
article
Data de publicação
2023
Título da Revista
ISSN da Revista
Título do Volume
Editora
CAMBRIDGE UNIV PRESS
Autores
AAS, Monica
ALAMEDA, Luis
FORTI, Marta Di
QUATTRONE, Diego
DAZZAN, Paola
TROTTA, Antonella
FERRARO, Laura
RODRIGUEZ, Victoria
VASSOS, Evangelos
SHAM, Pak
Citação
PSYCHOLOGICAL MEDICINE, v.53, n.5, p.1970-1978, 2023
Resumo
Background A history of childhood adversity is associated with psychotic disorder, with an increase in risk according to the number of exposures. However, it is not known why only some exposed individuals go on to develop psychosis. One possibility is pre-existing polygenic vulnerability. Here, we investigated, in the largest sample of first-episode psychosis (FEP) cases to date, whether childhood adversity and high polygenic risk scores for schizophrenia (SZ-PRS) combine synergistically to increase the risk of psychosis, over and above the effect of each alone. Methods We assigned a schizophrenia-polygenic risk score (SZ-PRS), calculated from the Psychiatric Genomics Consortium (PGC2), to all participants in a sample of 384 FEP patients and 690 controls from the case-control component of the EU-GEI study. Only participants of European ancestry were included in the study. A history of childhood adversity was collected using the Childhood Trauma Questionnaire (CTQ). Synergistic effects were estimated using the interaction contrast ratio (ICR) [odds ratio (OR)(exposure and PRS) - ORexposure - ORPRS + 1] with adjustment for potential confounders. Results There was some evidence that the combined effect of childhood adversities and polygenic risk was greater than the sum of each alone, as indicated by an ICR greater than zero [i.e. ICR 1.28, 95% confidence interval (CI) -1.29 to 3.85]. Examining subtypes of childhood adversities, the strongest synergetic effect was observed for physical abuse (ICR 6.25, 95% CI -6.25 to 20.88). Conclusions Our findings suggest possible synergistic effects of genetic liability and childhood adversity experiences in the onset of FEP, but larger samples are needed to increase precision of estimates.
Palavras-chave
Childhood trauma, first-episode psychosis, interaction contrast ratio, polygenic risk, schizophrenia, synergistic effects
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