Joint analysis of psychiatric disorders increases accuracy of risk prediction for schizophrenia, bipolar disorder, and major depressive disorder

Cross-Disorder Working Group of the Psychiatric Genomics Consortium

Research output: Contribution to journalArticle

96 Citations (Scopus)

Abstract

Genetic risk prediction has several potential applications in medical research and clinical practice and could be used, for example, to stratify a heterogeneous population of patients by their predicted genetic risk. However, for polygenic traits, such as psychiatric disorders, the accuracy of risk prediction is low. Here we use a multivariate linear mixed model and apply multi-trait genomic best linear unbiased prediction for genetic risk prediction. This method exploits correlations between disorders and simultaneously evaluates individual risk for each disorder. We show that the multivariate approach significantly increases the prediction accuracy for schizophrenia, bipolar disorder, and major depressive disorder in the discovery as well as in independent validation datasets. By grouping SNPs based on genome annotation and fitting multiple random effects, we show that the prediction accuracy could be further improved. The gain in prediction accuracy of the multivariate approach is equivalent to an increase in sample size of 34% for schizophrenia, 68% for bipolar disorder, and 76% for major depressive disorders using single trait models. Because our approach can be readily applied to any number of GWAS datasets of correlated traits, it is a flexible and powerful tool to maximize prediction accuracy. With current sample size, risk predictors are not useful in a clinical setting but already are a valuable research tool, for example in experimental designs comparing cases with high and low polygenic risk.

Original languageEnglish (US)
Pages (from-to)283-294
Number of pages12
JournalAmerican Journal of Human Genetics
Volume96
Issue number2
DOIs
StatePublished - Feb 5 2015

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Major Depressive Disorder
Bipolar Disorder
Psychiatry
Schizophrenia
Sample Size
Multifactorial Inheritance
Genome-Wide Association Study
Single Nucleotide Polymorphism
Biomedical Research
Linear Models
Research Design
Genome
Research
Population

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

Cite this

Joint analysis of psychiatric disorders increases accuracy of risk prediction for schizophrenia, bipolar disorder, and major depressive disorder. / Cross-Disorder Working Group of the Psychiatric Genomics Consortium.

In: American Journal of Human Genetics, Vol. 96, No. 2, 05.02.2015, p. 283-294.

Research output: Contribution to journalArticle

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