Abstract
Neuregulin 1 (NRG1) is one of the most promising candidate genes for schizophrenia. A number of replication studies have been conducted, although the results were inconsistent and no susceptible variant has yet been identified. The inconsistency might be attributed to the ethnic difference in allele and haplotype frequencies. However, it is equally possible that one or more genes interacting with NRG1 may also be implicated in schizophrenia and attribute to the inconsistency. To test the hypothesis, we conducted an interaction analysis between NRG1 and one of its receptor’s (ERBB4) polymorphisms as well as the association analysis of the two genes associated with schizophrenia in Japanese. We observed no significant difference between patients and controls in allele frequencies or genotypic distributions of the 18 polymorphisms of the genes. The permutation test showed no significant differences in estimated haplotype frequencies between patients and controls, including the haplotype HAPICE. In the interaction analysis, significant interaction was observed between rs2919381 in NRG1 and rs7560730 in ERBB4 (P = 0.047, corrected). Thus, our results suggest the possibility that interaction between variants in NRG1 and ERBB4 might contribute to susceptibility for schizophrenia in a Japanese population. Further investigation may be necessary to confirm our results.
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10038_2008_332_MOESM1_ESM.tif (download TIF )
The strength of LD between pairs of polymorphisms in patients and controls. The values of r 2 for patients are shown in the upper portion and those for controls in the lower portion. a NRG1 HAPICE region. Two microsatellites were treated as binary polymorphisms consisting of major allele and others. b NRG1 3’ end region. c ERBB4 (TIFF 306 kb)
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Shiota, S., Tochigi, M., Shimada, H. et al. Association and interaction analyses of NRG1 and ERBB4 genes with schizophrenia in a Japanese population. J Hum Genet 53, 929–935 (2008). https://doi.org/10.1007/s10038-008-0332-9
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DOI: https://doi.org/10.1007/s10038-008-0332-9
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