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Using Clinical Characteristics to Identify Which Patients With Major Depressive Disorder Have a Higher Genetic Load for Three Psychiatric Disorders.

Abstract：

BACKGROUND:Limited successes of gene finding for major depressive disorder (MDD) may be partly due to phenotypic heterogeneity. We tested whether the genetic load for MDD, bipolar disorder, and schizophrenia (SCZ) is increased in phenotypically more homogenous MDD patients identified by specific clinical characteristics. METHODS:Patients (n = 1539) with a DSM-IV MDD diagnosis and control subjects (n = 1792) were from two large cohort studies (Netherlands Study of Depression and Anxiety and Netherlands Twin Register). Genomic profile risk scores (GPRSs) for MDD, bipolar disorder, and SCZ were based on meta-analysis results of the Psychiatric Genomics Consortium. Regression analyses (adjusted for year of birth, sex, three principal components) examined the association between GPRSs with characteristics and GPRSs with MDD subgroups stratified according to the most relevant characteristics. The proportion of liability variance explained by GPRSs for each MDD subgroup was estimated. RESULTS:GPRS-MDD explained 1.0% (p = 4.19e-09) of MDD variance, and 1.5% (p = 4.23e-09) for MDD endorsing nine DSM symptoms. GPRS-bipolar disorder explained 0.6% (p = 2.97e-05) of MDD variance and 1.1% (p = 1.30e-05) for MDD with age at onset <18 years. GPRS-SCZ explained 2.0% (p = 6.15e-16) of MDD variance, 2.6% (p = 2.88e-10) for MDD with higher symptom severity, and 2.3% (p = 2.26e-13) for MDD endorsing nine DSM symptoms. An independent sample replicated the same pattern of stronger associations between cases with more DSM symptoms, as compared to overall MDD, and GPRS-SCZ. CONCLUSIONS:MDD patients with early age at onset and higher symptom severity have an increased genetic risk for three major psychiatric disorders, suggesting that it is useful to create phenotypically more homogenous groups when searching for genes associated with MDD.

journal_name

Biol Psychiatry

journal_title

Biological psychiatry

authors

Verduijn J,Milaneschi Y,Peyrot WJ,Hottenga JJ,Abdellaoui A,de Geus EJC,Smit JH,Breen G,Lewis CM,Boomsma DI,Beekman ATF,Penninx BWJH

doi

10.1016/j.biopsych.2016.05.024

subject

Has Abstract

pub_date

2017-02-15 00:00:00

pages

316-324

issue

eissn

0006-3223

issn

1873-2402

pii

S0006-3223(16)32469-6

journal_volume

pub_type

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Using Clinical Characteristics to Identify Which Patients With Major Depressive Disorder Have a Higher Genetic Load for Three Psychiatric Disorders.