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Magarbeh, L; Hassel, C; Choi, M; Islam, F; Marshe, VS; Zai, CC; Zuberi, R; Gammal, RS; Men, X; Scherf-Clavel, M; Enko, D; Frey, BN; Milev, R; Soares, CN; Parikh, SV; Placenza, F; Strother, SC; Hassel, S; Taylor, VH; Leri, F; Blier, P; Farzan, F; Lam, RW; Turecki, G; Foster, JA; Rotzinger, S; Kloiber, S; Kennedy, JL; Kennedy, SH; Bousman, CA; Müller, DJ.
ABCB1 gene variants and Antidepressant Treatment Outcomes: A Systematic Review and Meta-analysis including results from the CAN-BIND-1 Study.
Clin Pharmacol Ther. 2023; Doi: 10.1002/cpt.2854
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Co-Autor*innen der Med Uni Graz
Enko Dietmar

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The P-glycoprotein efflux pump, encoded by the ABCB1 gene, has been shown to alter concentrations of various antidepressants in the brain. In this study, we conducted a systematic review and meta-analysis to investigate the association between six ABCB1 SNPs (rs1045642, rs2032582, rs1128503, rs2032583, rs2235015, rs2235040) and antidepressant treatment outcomes in individuals with major depressive disorder (MDD), including new data from the Canadian Biomarker and Integration Network for Depression (CAN-BIND-1) cohort. For the CAN-BIND-1 sample, we applied regression models to investigate the association between ABCB1 SNPs and antidepressant treatment response, remission, tolerability, and antidepressant serum levels. For the meta-analysis, we systematically summarized pharmacogenetic evidence of the association between ABCB1 SNPs and antidepressant treatment outcomes. Studies were included in the meta-analysis if they investigated at least one ABCB1 SNP in individuals with MDD treated with at least one antidepressant. We did not find a significant association between ABCB1 SNPs and antidepressant treatment outcomes in the CAN-BIND-1 sample. A total of 39 studies were included in the systematic review. In the meta-analysis, we observed a significant association between rs1128503 and treatment response (T vs C-allele, OR= 1.30, 95% CI [1.15-1.48], p-value (adjusted)= 0.024, n=2526). We did not find associations between the six SNPs and treatment remission nor tolerability. Our findings provide limited evidence for an association between common ABCB1 SNPs and antidepressant outcomes, which do not support the implementation of ABCB1 genotyping to inform antidepressant treatment at this time. Future research, especially on rs1128503, is recommended.

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