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Published in: Cancer Causes & Control 4/2012

Open Access 01-04-2012 | Original paper

Association of cord blood methylation fractions at imprinted insulin-like growth factor 2 (IGF2), plasma IGF2, and birth weight

Authors: Cathrine Hoyo, Kimberly Fortner, Amy P. Murtha, Joellen M. Schildkraut, Adelheid Soubry, Wendy Demark-Wahnefried, Randy L. Jirtle, Joanne Kurtzberg, Michele R. Forman, Francine Overcash, Zhiqing Huang, Susan K. Murphy

Published in: Cancer Causes & Control | Issue 4/2012

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Abstract

Purpose

Altered methylation at Insulin-like Growth Factor 2 (IGF2) regulatory regions has previously been associated with obesity, and several malignancies including colon, esophageal, and prostate adenocarcinomas, presumably via changes in expression and/or loss of imprinting, but the functional significance of these DNA methylation marks have not been demonstrated in humans. We examined associations among DNA methylation at IGF2 differentially methylated regions (DMRs), circulating IGF2 protein concentrations in umbilical cord blood (UCB) and birth weight in newborns.

Methods

Questionnaire data were obtained from 300 pregnant women recruited between 2005 and 2009. UCB DNA methylation was measured by bisulfite pyrosequencing. UCB plasma concentrations of soluble IGF2 were measured by ELISA assays. Generalized linear regression models were used to examine the relationship between DMR methylation and IGF2 levels.

Results

Lower IGF2 DMR methylation was associated with elevated plasma IGF2 protein concentrations (β = −9.87, p < 0.01); an association that was stronger in infants born to obese women (pre-pregnancy BMI > 30 kg/m2, β = −20.21, p < 0.0001). Elevated IGF2 concentrations were associated with higher birth weight (p < 0.0001) after adjusting for maternal race/ethnicity, pre-pregnancy BMI, cigarette smoking, gestational diabetes, and infant sex. These patterns of association were not apparent at the H19 DMR.

Conclusion

Our data suggest that variation in IGF2 DMR methylation is an important mechanism by which circulating IGF2 concentrations, a putative risk factor for obesity and cancers of the colon, esophagus, and prostate, are modulated; associations that may depend on pre-pregnancy obesity.
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Metadata
Title
Association of cord blood methylation fractions at imprinted insulin-like growth factor 2 (IGF2), plasma IGF2, and birth weight
Authors
Cathrine Hoyo
Kimberly Fortner
Amy P. Murtha
Joellen M. Schildkraut
Adelheid Soubry
Wendy Demark-Wahnefried
Randy L. Jirtle
Joanne Kurtzberg
Michele R. Forman
Francine Overcash
Zhiqing Huang
Susan K. Murphy
Publication date
01-04-2012
Publisher
Springer Netherlands
Published in
Cancer Causes & Control / Issue 4/2012
Print ISSN: 0957-5243
Electronic ISSN: 1573-7225
DOI
https://doi.org/10.1007/s10552-012-9932-y

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