No evidence for enrichment in schizophrenia for common allelic associations at imprinted loci

Escott-Price, Valentina ORCID: https://orcid.org/0000-0003-1784-5483, Kirov, George ORCID: https://orcid.org/0000-0002-3427-3950, Rees, Elliott ORCID: https://orcid.org/0000-0002-6168-9222, Isles, Anthony Roger ORCID: https://orcid.org/0000-0002-7587-5712, Owen, Michael John ORCID: https://orcid.org/0000-0003-4798-0862 and O'Donovan, Michael Conlon ORCID: https://orcid.org/0000-0001-7073-2379 2015. No evidence for enrichment in schizophrenia for common allelic associations at imprinted loci. PLoS ONE 10 (12) , -. 10.1371/journal.pone.0144172

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Abstract

Most genetic studies assume that the function of a genetic variant is independent of the parent from which it is inherited, but this is not always true. The best known example of parent-of-origin effects arises with respect to alleles at imprinted loci. In classical imprinting, characteristically, either the maternal or paternal copy is expressed, but not both. Only alleles present in one of the parental copies of the gene, the expressed copy, is likely to contribute to disease. It has been postulated that imprinting is important in central nervous system development, and that consequently, imprinted loci may be involved in schizophrenia. If this is true, allowing for parent-of-origin effects might be important in genetic studies of schizophrenia. Here, we use genome-wide association data from one of the world’s largest samples (N=695) of parent schizophrenia-offspring trios to test for parent-of-origin effects. To maximise power, we restricted our analyses to test two main hypotheses. If imprinting plays a disproportionate role in schizophrenia susceptibility, we postulated a) that alleles showing robust evidence for association to schizophrenia from previous genome-wide association studies should be enriched for parent-of-origin effects and b) that genes at loci imprinted in humans or mice should be enriched both for genome-wide significant associations, and in our sample, for parent-of-origin effects. Neither prediction was supported in the present study. We have shown, that it is unlikely that parent-of-origin effects or imprinting play particularly important roles in schizophrenia, although our findings do not exclude such effects at specific loci nor do they exclude such effects among rare alleles.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Neuroscience and Mental Health Research Institute (NMHRI) Medicine Advanced Research Computing @ Cardiff (ARCCA) MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Subjects:	R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Publisher:	Public Library of Science
ISSN:	1932-6203
Funders:	MRC
Date of First Compliant Deposit:	30 March 2016
Date of Acceptance:	13 November 2015
Last Modified:	14 May 2023 18:06
URI:	https://orca.cardiff.ac.uk/id/eprint/84408

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