Cited by 460Epigenetics and DNA MethylationSchizophrenia research and treatmentGenetic Associations and Epidemiology

Disease-associated epigenetic changes in monozygotic twins discordant for schizophrenia and bipolar disorder

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Dempster, Emma L., Pidsley, Ruth, Schalkwyk, Leonard C., Owens, Sheena, Georgiades, Anna, Kane, Fergus, Kalidindi, Sridevi, Picchioni, Marco +4 more·2011·Human Molecular Genetics

Abstract

Studies of the major psychoses, schizophrenia (SZ) and bipolar disorder (BD), have traditionally focused on genetic and environmental risk factors, although more recent work has highlighted an additional role for epigenetic processes in mediating susceptibility. Since monozygotic (MZ) twins share a common DNA sequence, their study represents an ideal design for investigating the contribution of epigenetic factors to disease etiology. We performed a genome-wide analysis of DNA methylation on peripheral blood DNA samples obtained from a unique sample of MZ twin pairs discordant for major psychosis. Numerous loci demonstrated disease-associated DNA methylation differences between twins discordant for SZ and BD individually, and together as a combined major psychosis group. Pathway analysis of our top loci highlighted a significant enrichment of epigenetic changes in biological networks and pathways directly relevant to psychiatric disorder and neurodevelopment. The top psychosis-associated, differentially methylated region, significantly hypomethylated in affected twins, was located in the promoter of ST6GALNAC1 overlapping a previously reported rare genomic duplication observed in SZ. The mean DNA methylation difference at this locus was 6%, but there was considerable heterogeneity between families, with some twin pairs showing a 20% difference in methylation. We subsequently assessed this region in an independent sample of postmortem brain tissue from affected individuals and controls, finding marked hypomethylation (>25%) in a subset of psychosis patients. Overall, our data provide further evidence to support a role for DNA methylation differences in mediating phenotypic differences between MZ twins and in the etiology of both SZ and BD.

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Authors
Dempster, E. L., Pidsley, R., Schalkwyk, L. C., Owens, S., Georgiades, A., Kane, F., Kalidindi, S., Picchioni, M., Kravariti, E., Toulopoulou, T., Murray, R. M., & Mill, J.
Affiliations
King's College London (GB)
Corresponding author
Mill, Jonathan
Venue
Human Molecular Genetics
Published
2011-09-09
Volume
20
Issue
24
Pages
4786-4796
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2122230573
Cited by
460
References
57
Citations by year
2026: 7 · 2025: 7 · 2024: 13 · 2023: 10 · 2022: 12 · 2021: 24 · 2020: 20 · 2019: 23 · 2018: 23 · 2017: 34 · 2016: 49 · 2015: 50 · 2014: 80 · 2013: 56 · 2012: 49
FWCI
24.43
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Human Molecular Genetics (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Open Access at Essex (University of Essex) (acceptedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by-nc)
  • UCL Discovery (University College London) (submittedVersion)
  • The HKU Scholars Hub (University of Hong Kong) (submittedVersion)
  • Research Portal (King's College London) (submittedVersion)
Funders
  • Wellcome Trust
  • National Institute on Aging (R01AG036039, AG036039)
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, bipolar disorder, monozygotic twins, DNA methylation, epigenetics, psychosis, ST6GALNAC1, genomic duplication, promoter hypomethylation, postmortem brain, etiology, differentially methylated regions
MeSH terms
Bipolar Disorder, Demography, Female, Humans, Male, Promoter Regions, Genetic, Schizophrenia, Twins, Monozygotic, Reproducibility of Results, Genome, Human, CpG Islands, DNA Methylation, Genetic Predisposition to Disease, Epigenesis, Genetic, Gene Regulatory Networks, Young Adult

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