DNA methylation differences in monozygotic twin pairs discordant for schizophrenia identifies psychosis related genes and networks

BMC Medical Genomics

Shiva M Singh¹  Richard L O’Reilly¹  Eric J Diehl²  Melkaye G Melka²  Benjamin I Laufer²  Christina A Castellani² 

[1] Department of Psychiatry, The University of Western Ontario, London, N6A 5B7, Ontario, Canada;Department of Biology, The University of Western Ontario, London, N6A 5B7, Ontario, Canada

关键词: Histone Clusters;    snoRNA;    Differentially Methylated Regions (DMRs);    Methylation Array;    MeDIP;    DNA Methylation;    Schizophrenia;    Monozygotic Twins;   

Others  :  1211007
DOI  :  10.1186/s12920-015-0093-1

 received in 2015-01-05, accepted in 2015-04-24,  发布年份 2015

【 摘 要 】

Background

Despite their singular origin, monozygotic twin pairs often display discordance for complex disorders including schizophrenia. It is a common (1%) and often familial disease with a discordance rate of ~50% in monozygotic twins. This high discordance is often explained by the role of yet unknown environmental, random, and epigenetic factors. The involvement of DNA methylation in this disease appears logical, but remains to be established.

Methods

We have used blood DNA from two pairs of monozygotic twins discordant for schizophrenia and their parents in order to assess genome-wide methylation using a NimbleGen Methylation Promoter Microarray.

Results

The genome-wide results show that differentially methylated regions (DMRs) exist between members representing discordant monozygotic twins. Some DMRs are shared with parent(s) and others appear to be de novo. We found twenty-seven genes affected by DMR changes that were shared in the affected member of two discordant monozygotic pairs from unrelated families. Interestingly, the genes affected by pair specific DMRs share specific networks. Specifically, this study has identified two networks; “cell death and survival” and a “cellular movement and immune cell trafficking”. These two networks and the genes affected have been previously implicated in the aetiology of schizophrenia.

Conclusions

The results are compatible with the suggestion that DNA methylation may contribute to the discordance of monozygotic twins for schizophrenia. Also, this may be accomplished by the direct effect of gene specific methylation changes on specific biological networks rather than individual genes. It supports the extensive genetic, epigenetic and phenotypic heterogeneity implicated in schizophrenia.

【 授权许可】

   
2015 Castellani et al.; licensee BioMed Central.

【 图 表 】

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