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Non-random mating, parent-of-origin, and maternal-fetal incompatibility effects in schizophrenia

Kim, Y., Ripke, Stephan, Kirov, George, Sklar, Pamela, Purcell, Shaun M., Owen, Michael John, O'Donovan, Michael Conlon and Sullivan, Patrick F. 2013. Non-random mating, parent-of-origin, and maternal-fetal incompatibility effects in schizophrenia. Schizophrenia Research 143 (1) , pp. 11-17. 10.1016/j.schres.2012.11.002

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Although the association of common genetic variation in the extended MHC region with schizophrenia is the most significant yet discovered, the MHC region is one of the more complex regions of the human genome, with unusually high gene density and long-range linkage disequilibrium. The statistical test on which the MHC association is based is a relatively simple, additive model which uses logistic regression of SNP genotypes to predict case-control status. However, it is plausible that more complex models underlie this association. Using a well-characterized sample of trios, we evaluated more complex models by looking for evidence for: (a) non-random mating for HLA alleles, schizophrenia risk profiles, and ancestry; (b) parent-of-origin effects for HLA alleles; and (c) maternal-fetal genotype incompatibility in the HLA. We found no evidence for non-random mating in the parents of individuals with schizophrenia in terms of MHC genotypes or schizophrenia risk profile scores. However, there was evidence of non-random mating that appeared mostly to be driven by ancestry. We did not detect over-transmission of HLA alleles to affected offspring via the general TDT test (without regard to parent of origin) or preferential transmission via paternal or maternal inheritance. We evaluated the hypothesis that maternal-fetal HLA incompatibility may increase risk for schizophrenia using eight classical HLA loci. The most significant alleles were in HLA-B, HLA-C, HLA-DQB1, and HLA-DRB1 but none was significant after accounting for multiple comparisons. We did not find evidence to support more complex models of gene action, but statistical power may have been limiting.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Neuroscience and Mental Health Research Institute (NMHRI)
Subjects: R Medicine > R Medicine (General)
R Medicine > RZ Other systems of medicine
Uncontrolled Keywords: Human leukocyte antigens; Maternal-fetal incompatibility; Non-random mating; Schizophrenia;Family Health; Female; Gene Frequency; Genetic Association Studies; Genetic Predisposition to Disease; Genotype; Histocompatibility, Maternal-Fetal; HLA Antigens; Humans; Linkage Disequilibrium; Male; Parents; Polymorphism Single Nucleotide; Schizophrenia
Publisher: Elsevier
ISSN: 0920-9964
Last Modified: 04 Jun 2017 08:17

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