Multivariate permutation analysis associates multiple polymorphisms with subphenotypes of major depression

Genes, Brain and Behavior - Tập 7 Số 4 - Trang 487-495 - 2008
Maureen K. Hahn1, Jennifer Urbano Blackford1, Kirsten Haman1, Michelle S. Mazei‐Robison1, Brett A. English1, Harish C. Prasad1, Angela Steele1, Lisa A Hazelwood1, Hugh M. Fentress1, Regina L. Myers1, Randy Blakely1, Elaine Sanders‐Bush1, Richard C. Shelton1
1† Department of Pharmacology, ‡Department of Psychiatry and §Center for Molecular Neuroscience, Vanderbilt University School of Medicine, Nashville, TN, USA

Tóm tắt

Unipolar major depressive disorder (MDD) is a prevalent, disabling condition with multiple genetic and environmental factors impacting disease risk. The diagnosis of MDD relies on a cumulative measure derived from multiple trait dimensions and alone is limited in elucidating MDD genetic determinants. We and others have proposed that MDD may be better dissected using paradigms that assess how specific genes associate with component features of MDD. This within‐disease design requires both a well‐phenotyped cohort and a robust statistical approach that retains power with multiple tests of genetic association. In the present study, common polymorphic variants of genes related to central monoaminergic and cholinergic pathways that previous studies align with functional change in vitro or depression associations in vivo were genotyped in 110 individuals with unipolar MDD. Subphenotypic characteristics were examined using responses to individual items assessed with the Structured Clinical Interview for Diagnostic and Statistical Manual of Mental Disorders (DSM IV), the 17‐item Hamilton Rating Scale for Depression (HAM‐D) and the NEO Five Factor Inventory. Multivariate Permutation Testing (MPT) was used to infer genotype–phenotype relationships underlying dimensional findings within clinical categories. MPT analyses show significant associations of the norepinephrine transporter (NET, SLC6A2) ‐182 T/C (rs2242446) with recurrent depression [odds ratio, OR = 4.15 (1.91–9.02)], NET ‐3081 A/T (rs28386840) with increase in appetite [OR = 3.58 (1.53–8.39)] and the presynaptic choline transporter (CHT, SLC5A7) Ile89Val (rs1013940) with HAM‐D‐17 total score {i.e. overall depression severity [OR = 2.74 (1.05–7.18)]}. These relationships illustrate an approach to the elucidation of gene influences on trait components of MDD and with replication, may help identify MDD subpopulations that can benefit from more targeted pharmacotherapy.

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Genes, Brain and Behavior

Tập 7 Số 4

487-495

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