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  • Original Article
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No association of the IRS1 and PAX4 genes with type I diabetes

Abstract

To reassess earlier suggested type I diabetes (T1D) associations of the insulin receptor substrate 1 (IRS1) and the paired domain 4 gene (PAX4) genes, the Type I Diabetes Genetics Consortium (T1DGC) evaluated single-nucleotide polymorphisms (SNPs) covering the two genomic regions. Sixteen SNPs were evaluated for IRS1 and 10 for PAX4. Both genes are biological candidate genes for T1D. Genotyping was performed in 2300 T1D families on both Illumina and Sequenom genotyping platforms. Data quality and concordance between the platforms were assessed for each SNP. Transmission disequilibrium testing neither show T1D association of SNPs in the two genes, nor did haplotype analysis. In conclusion, the earlier suggested associations of IRS1 and PAX4 to T1D were not supported, suggesting that they may have been false positive results. This highlights the importance of thorough quality control, selection of tagging SNPs, more than one genotyping platform in high throughput studies, and sufficient power to draw solid conclusions in genetic studies of human complex diseases.

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Acknowledgements

This research uses resources provided by the Type I Diabetes Genetics Consortium, a collaborative clinical study sponsored by the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), National Institute of Allergy and Infectious Diseases (NIAID), National Human Genome Research Institute (NHGRI), National Institute of Child Health and Human Development (NICHD), and Juvenile Diabetes Research Foundation International (JDRF) and supported by U01 DK062418. We thank all the T1D families for their participation in the study. R Bergholdt was supported by a grant from the Danish Medical Research Council (271-05-0672). Genotyping was performed at the Broad Institute Center for Genotyping and Analysis is supported by grant U54 RR020278 from the National Center for Research Resources. BOB was support by the German Research Foundation (DFG: SFB 518 & GrK 1041).

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Correspondence to F Pociot.

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Bergholdt, R., Brorsson, C., Boehm, B. et al. No association of the IRS1 and PAX4 genes with type I diabetes. Genes Immun 10 (Suppl 1), S49–S53 (2009). https://doi.org/10.1038/gene.2009.91

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