Cited by 69Epigenetics and DNA MethylationSchizophrenia research and treatmentGenetic Associations and Epidemiology

Association of a reproducible epigenetic risk profile for schizophrenia with brain methylation and function

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Chen, Junfang, Zang, Zhenxiang, Braun, Urs, Schwarz, Kristina, Harneit, Anais, Kremer, Thomas, Ma, Ren, Schweiger, Janina +8 more·2020·JAMA Psychiatry

Abstract

Importance: Schizophrenia is a severe mental disorder in which epigenetic mechanisms may contribute to illness risk. Epigenetic profiles can be derived from blood cells, but to our knowledge, it is unknown whether these predict established brain alterations associated with schizophrenia. Objective: To identify an epigenetic signature (quantified as polymethylation score [PMS]) of schizophrenia using machine learning applied to genome-wide blood DNA-methylation data; evaluate whether differences in blood-derived PMS are mirrored in data from postmortem brain samples; test whether the PMS is associated with alterations of dorsolateral prefrontal cortex hippocampal (DLPFC-HC) connectivity during working memory in healthy controls (HC); explore the association between interactions between polygenic and epigenetic risk with DLPFC-HC connectivity; and test the specificity of the signature compared with other serious psychiatric disorders. Design, Setting, and Participants: In this case-control study conducted from 2008 to 2018 in sites in Germany, the United Kingdom, the United States, and Australia, blood DNA-methylation data from 2230 whole-blood samples from 6 independent cohorts comprising HC (1238 [55.5%]) and participants with schizophrenia (803 [36.0%]), bipolar disorder (39 [1.7%]), major depressive disorder 35 [1.6%]), and autism (27 [1.2%]), and first-degree relatives of all patient groups (88 [3.9%]) were analyzed. DNA-methylation data were further explored from 244 postmortem DLPFC samples from 136 HC and 108 patients with schizophrenia. Neuroimaging and genome-wide association data were available for 393 HC. The latter data was used to calculate a polygenic risk score (PRS) for schizophrenia. The data were analyzed in 2019. Main Outcomes and Measures: The accuracy of schizophrenia control classification based on machine learning using epigenetic data; association of schizophrenia PMS scores with DLPFC-HC connectivity; and association of the interaction between PRS and PMS with DLPFC-HC connectivity. Results: This study included 7488 participants (4395 men [58.7%]), of whom 3158 (2230 men [70.6%]) received a diagnosis of schizophrenia. The PMS signature was associated with schizophrenia across 3 independent data sets (area under the curve [AUC] from 0.69 to 0.78; P value from 0.049 to 1.24 × 10-7) and data from postmortem DLPFC samples (AUC = 0.63; P = 1.42 × 10-4), but not with major depressive disorder (AUC = 0.51; P = .16), autism (AUC = 0.53; P = .66), or bipolar disorder (AUC = 0.58; P = .21). Pathways contributing most to the classification included synaptic processes. Healthy controls with schizophrenia-like PMS showed significantly altered DLPFC-HC connectivity (validation methylation/magnetic resonance imaging, t < -3.81; P for familywise error, <.04; validation magnetic resonance imaging, t < -3.54; P for familywise error, <.02), mirroring the lack of functional decoupling in schizophrenia. There was no significant association of the interaction between PMS and PRS with DLPFC-HC connectivity (P > .19). Conclusions and Relevance: We identified a reproducible blood DNA-methylation signature specific for schizophrenia that was correlated with altered functional DLPFC-HC coupling during working memory and mapped to methylation differences found in DLPFC postmortem samples. This indicates a possible epigenetic contribution to a schizophrenia intermediate phenotype and suggests that PMS could be of interest to be studied in the context of multimodal biomarkers for disease stratification and treatment personalization.

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Authors
Chen, J., Zang, Z., Braun, U., Schwarz, K., Harneit, A., Kremer, T., Ma, R., Schweiger, J., Moessnang, C., Geiger, L., Cao, H., Degenhardt, F., Nöthen, M. M., Tost, H., Meyer-Lindenberg, A., & Schwarz, E.
Affiliations
  • Heidelberg University (DE)
  • University of Bonn (DE)
  • Central Institute of Mental Health, Department of Psychiatry and Psychotherapy, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
Corresponding author
Schwarz, Emanuel
Venue
JAMA Psychiatry
Published
2020-06-01
Volume
77
Issue
6
Pages
628
ISSN
2168-622X (ISSN-L)
OpenAlex
W3005902259
Cited by
69
References
57
Citations by year
2026: 6 · 2025: 8 · 2024: 11 · 2023: 15 · 2022: 11 · 2021: 15 · 2020: 3
FWCI
3.57
Type
journal article
Language
en
Open access
Locations
  • JAMA Psychiatry (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Deutsche Forschungsgemeinschaft
  • Agence Nationale de la Recherche (ANR-18-PERM-0011)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
Keywords
schizophrenia, DNA methylation, polygenic risk score, dorsolateral prefrontal cortex, hippocampus, working memory, postmortem brain, bipolar disorder, major depressive disorder, autism spectrum disorder, mental illness, machine learning
MeSH terms
Machine Learning, Adult, Female, Hippocampus, Humans, Magnetic Resonance Imaging, Male, Middle Aged, Neural Pathways, Schizophrenia, Biomarkers, Case-Control Studies, Prefrontal Cortex, DNA Methylation, Epigenesis, Genetic, Genome-Wide Association Study, Neuroimaging

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