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Genome-Wide Association Identifies a Common Variant in the Reelin Gene That Increases the Risk of Schizophrenia Only in Women

2008; Public Library of Science; Volume: 4; Issue: 2 Linguagem: Inglês

10.1371/journal.pgen.0040028

1553-7404

Sagiv Shifman, Martina Johannesson, Michal Bronstein, Sam X Chen, David Collier, Nicholas John Craddock, Kenneth S. Kendler, Tao Li, Michael O’Donovan, F. Anthony O’Neill, Michael J. Owen, Dermot Walsh, Daniel R. Weinberger, Cuie Sun, Jonathan Flint, Ariel Darvasi,

Epigenetics and DNA Methylation

Sex differences in schizophrenia are well known, but their genetic basis has not been identified. We performed a genome-wide association scan for schizophrenia in an Ashkenazi Jewish population using DNA pooling. We found a female-specific association with rs7341475, a SNP in the fourth intron of the reelin (RELN) gene (p = 2.9 × 10−5 in women), with a significant gene-sex effect (p = 1.8 × 10−4). We studied rs7341475 in four additional populations, totaling 2,274 cases and 4,401 controls. A significant effect was observed only in women, replicating the initial result (p = 2.1 × 10−3 in women; p = 4.2 × 10−3 for gene-sex interaction). Based on all populations the estimated relative risk of women carrying the common genotype is 1.58 (p = 8.8 × 10−7; p = 1.6 × 10−5 for gene-sex interaction). The female-specific association between RELN and schizophrenia is one of the few examples of a replicated sex-specific genetic association in any disease.