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- W2032542021 abstract "To identify polymorphisms associated with variability of iron overload severity in HFE‐associated hemochromatosis, we performed exome sequencing of DNA from 35 male HFE C282Y homozygotes with either markedly increased iron stores (n = 22; cases) or with normal or mildly increased iron stores (n = 13; controls). The 35 participants, residents of the United States, Canada, and Australia, reported no or light alcohol consumption. Sequencing data included 82,068 single‐nucleotide variants, and 10,337 genes were tested for a difference between cases and controls. A variant in the GNPAT gene showed the most significant association with severe iron overload (P = 3 × 10−6; P = 0.033 by the likelihood ratio test after correction for multiple comparisons). Sixteen of twenty‐two participants with severe iron overload had glyceronephosphate O‐acyltransferase (GNPAT) polymorphism p.D519G (rs11558492; 15 heterozygotes, one homozygote). No control participant had this polymorphism. To examine functional consequences of GNPAT deficiency, we performed small interfering RNA–based knockdown of GNPAT in the human liver‐derived cell line, HepG2/C3A. This knockdown resulted in a >17‐fold decrease in expression of the messenger RNA encoding the iron‐regulatory hormone, hepcidin. Conclusion: GNPAT p.D519G is associated with a high‐iron phenotype in HFE C282Y homozygotes and may participate in hepcidin regulation. (Hepatology 2015;62:429–439" @default.
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- W2032542021 date "2015-03-18" @default.
- W2032542021 modified "2023-10-16" @default.
- W2032542021 title "Exome sequencing in HFE C282Y homozygous men with extreme phenotypes identifies a GNPAT variant associated with severe iron overload" @default.
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- W2032542021 doi "https://doi.org/10.1002/hep.27711" @default.
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