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BMC Medicine
Published in: BMC Medicine 1/2009

Open Access 01-12-2009 | Research article

Genomic and epigenetic evidence for oxytocin receptor deficiency in autism

Authors: Simon G Gregory, Jessica J Connelly, Aaron J Towers, Jessica Johnson, Dhani Biscocho, Christina A Markunas, Carla Lintas, Ruth K Abramson, Harry H Wright, Peter Ellis, Cordelia F Langford, Gordon Worley, G Robert Delong, Susan K Murphy, Michael L Cuccaro, Antonello Persico, Margaret A Pericak-Vance

Published in: BMC Medicine | Issue 1/2009

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Abstract

Background

Autism comprises a spectrum of behavioral and cognitive disturbances of childhood development and is known to be highly heritable. Although numerous approaches have been used to identify genes implicated in the development of autism, less than 10% of autism cases have been attributed to single gene disorders.

Methods

We describe the use of high-resolution genome-wide tilepath microarrays and comparative genomic hybridization to identify copy number variants within 119 probands from multiplex autism families. We next carried out DNA methylation analysis by bisulfite sequencing in a proband and his family, expanding this analysis to methylation analysis of peripheral blood and temporal cortex DNA of autism cases and matched controls from independent datasets. We also assessed oxytocin receptor (OXTR) gene expression within the temporal cortex tissue by quantitative real-time polymerase chain reaction (PCR).

Results

Our analysis revealed a genomic deletion containing the oxytocin receptor gene, OXTR (MIM accession no.: 167055), previously implicated in autism, was present in an autism proband and his mother who exhibits symptoms of obsessive-compulsive disorder. The proband's affected sibling did not harbor this deletion but instead may exhibit epigenetic misregulation of this gene through aberrant gene silencing by DNA methylation. Further DNA methylation analysis of the CpG island known to regulate OXTR expression identified several CpG dinucleotides that show independent statistically significant increases in the DNA methylation status in the peripheral blood cells and temporal cortex in independent datasets of individuals with autism as compared to control samples. Associated with the increase in methylation of these CpG dinucleotides is our finding that OXTR mRNA showed decreased expression in the temporal cortex tissue of autism cases matched for age and sex compared to controls.

Conclusion

Together, these data provide further evidence for the role of OXTR and the oxytocin signaling pathway in the etiology of autism and, for the first time, implicate the epigenetic regulation of OXTR in the development of the disorder.
See the related commentary by Gurrieri and Neri: http://​www.​biomedcentral.​com/​1741-7015/​7/​63
Appendix
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Metadata
Title
Genomic and epigenetic evidence for oxytocin receptor deficiency in autism
Authors
Simon G Gregory
Jessica J Connelly
Aaron J Towers
Jessica Johnson
Dhani Biscocho
Christina A Markunas
Carla Lintas
Ruth K Abramson
Harry H Wright
Peter Ellis
Cordelia F Langford
Gordon Worley
G Robert Delong
Susan K Murphy
Michael L Cuccaro
Antonello Persico
Margaret A Pericak-Vance
Publication date
01-12-2009
Publisher
BioMed Central
Published in
BMC Medicine / Issue 1/2009
Electronic ISSN: 1741-7015
DOI
https://doi.org/10.1186/1741-7015-7-62

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