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Type: Journal article
Title: Clinical outcomes and genome-wide association for a brain methylation site in an antidepressant pharmacogenetics study in Mexican Americans
Author: Wong, M.
Dong, C.
Flores, D.
Ehrhart-Bornstein, M.
Bornstein, S.
Arcos-Burgos, M.
Licinio, J.
Citation: American Journal of Psychiatry, 2014; 171(12):1297-1309
Publisher: American Psychiatric Publishing
Issue Date: 2014
ISSN: 0002-953X
Statement of
Ma-Li Wong, Chuanhui Dong, Deborah L. Flores, Monika Ehrhart-Bornstein, Stefan Bornstein, Mauricio Arcos-Burgos, Julio Licinio
Abstract: OBJECTIVE: The authors compared the effectiveness of fluoxetine and desipramine treatment in a prospective double-blind pharmacogenetics study in first-generation Mexican Americans and examined the role of whole-exome functional gene variations in the patients' antidepressant response. METHOD: A total of 232 Mexican Americans who met DSM-IV criteria for major depressive disorder were randomly assigned to receive 8 weeks of double-blind treatment with desipramine (50-200 mg/day) or fluoxetine (10-40 mg/day) after a 1-week placebo lead-in period. Outcome measures included the Hamilton Depression Rating Scale (HAM-D), the Hamilton Anxiety Rating Scale, and the Beck Depression Inventory. At week 8, whole-exome genotyping data were obtained for 36 participants who remitted and 29 who did not respond to treatment. RESULTS: Compared with desipramine treatment, fluoxetine treatment was associated with a greater reduction in HAM-D score, higher response and remission rates, shorter time to response and remission, and lower incidences of anticholinergic and cardiovascular side effects. Pharmacogenetics analysis showed that exm-rs1321744 achieved exome-wide significance for treatment remission. This variant is located in a brain methylated DNA immunoprecipitation sequencing site, which suggests that it may be involved in epigenetic regulation of neuronal gene expression. This and two other common gene variants provided a highly accurate cross-validated predictive model for treatment remission of major depression (receiver operating characteristic integral=0.95). CONCLUSIONS: Compared with desipramine, fluoxetine treatment showed a more rapid reduction of HAM-D score and a lower incidence of side effects in a population comprising primarily first-generation Mexican Americans with major depression. This study's pharmacogenetics approach strongly implicates the role of functional variants in antidepressant treatment response.
Keywords: Humans
Rights: Copyright © American Psychiatric Association. All rights reserved.
DOI: 10.1176/appi.ajp.2014.12091165
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