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• W2169714441 abstract "Even if genetics play an important role, individual variation in stature remains unexplained at the molecular level. Indeed, genome-wide association study (GWAS) have revealed hundreds of variants that contribute to the variability of height but could explain only a limited part of it, and no single variant accounts for more than 0.3% of height variance. At the interface of genetics and environment, epigenetics contributes to phenotypic diversity. Quantifying the impact of epigenetic variation on quantitative traits, an emerging challenge in humans, has not been attempted for height. Since insulin-like growth factor 1 (IGF1) controls postnatal growth, we tested whether the CG methylation of the two promoters (P1 and P2) of the IGF1 gene is a potential epigenetic contributor to the individual variation in circulating IGF1 and stature in growing children. Child height was closely correlated with serum IGF1. The methylation of a cluster of six CGs located within the proximal part of the IGF1 P2 promoter showed a strong negative association with serum IGF1 and growth. The highest association was for CG-137 methylation, which contributed 13% to the variance of height and 10% to serum IGF1. CG methylation (studied in children undergoing surgery) was approximately 50% lower in liver and growth plates, indicating that the IGF1 promoters are tissue-differentially methylated regions (t-DMR). CG methylation was inversely correlated with the transcriptional activity of the P2 promoter in mononuclear blood cells and in transfection experiments, suggesting that the observed association of methylation with the studied traits reflects true biological causality. Our observations introduce epigenetics among the individual determinants of child growth and serum IGF1. The P2 promoter of the IGF1 gene is the first epigenetic quantitative trait locus (QTLepi) reported in humans. The CG methylation of the P2 promoter takes place among the multifactorial factors explaining the variation in human stature." @default.
• W2169714441 created "2016-06-24" @default.
• W2169714441 creator A5005982466 @default.
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• W2169714441 creator A5081663196 @default.
• W2169714441 date "2015-03-13" @default.
• W2169714441 modified "2023-10-14" @default.
• W2169714441 title "The IGF1 P2 promoter is an epigenetic QTL for circulating IGF1 and human growth" @default.
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• W2169714441 doi "https://doi.org/10.1186/s13148-015-0062-8" @default.
• W2169714441 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4363053" @default.
• W2169714441 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25789079" @default.
• W2169714441 hasPublicationYear "2015" @default.
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