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Gutiérrez, Blanca, PhD; Rivera, Margarita, PhD; Molina, Esther, PhD; Torres-González, Francisco, MD, PhD; Cervilla, Jorge, MD, PhD; Bellón, Juan Ángel, MD, PhD; Moreno-Peral, Patricia, PhD; King, Michael, MD, PhD; Nazareth, Irwin, MD, PhD; Marston, Louise, PhD; Moreno-Küstner, Berta, PhD; Motrico, Emma, PhD; Montón-Franco, Carmen, MD, PhD; GildeGómez-Barragán, María Josefa, MD, PhD; Sánchez-Celaya, Marta, MD, PhD; Díaz-Barreiros, Miguel Ángel, MD, PhD; Vicens, Catalina, MD, PhD; de Dios Luna, Juan, PhD
Journal of psychiatry & neuroscience, 05/2015, Volume: 40, Issue: 3Journal Article
Background There is limited evidence for a moderating role of both serotonin transporter ( SERT ) and brain-derived neurotrophic factor ( BDNF ) genes on the risk for major depression (MD) developing after childhood maltreatment. However, research on this topic remains inconclusive, and there is a lack of data from longitudinal studies with large and representative population samples. Our study aimed to clarify whether, in the presence of previous childhood maltreatment, individuals carrying low functional alleles for both SERT 5-HTTLPR and BDNF Val66Met polymorphisms had a higher risk for MD. Methods We explored 2- and 3-way gene ( SERT and BDNF ) × environment (childhood maltreatment) interactions in a large sample of Spanish adults who were followed up over a 3-year period and assessed in person for both DSM-IV MD and exposure to childhood maltreatment. Results Our study included 2679 participants. Those with both the 5-HTTLPR s allele and the BDNF Met allele showed the highest risk of MD if they had previously experienced emotional ( z = 2.08, p = 0.037), sexual ( z = 2.19, p = 0.029) or any kind of childhood abuse ( z = 2.37, p = 0.018). These 3-way interactions remained significant regardless of whether the 5-HTTLPR triallelic or the 5-HTTLPR biallelic polymorphisms were included in the analyses. Limitations Retrospective assessment of childhood maltreatment may have resulted in a moderate degree of recall bias. Conclusion Our results confirm that the risk of depression conferred by childhood maltreatment is modified by variation at both SERT and BDNF genes.
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