DNA Methylation

Separating inherited effects from methylation-signature strength

by Leona Vale

The distinction between direct and indirect genetic effects of birthweight predisposition matters for interpreting DNA methylation at birth. Beyond statistical significance, are effect sizes placed within age- and tissue-appropriate methylation reference ranges? Reporting how estimates shift across the direct, indirect and combined models could show whether adjustment removes confounding, weakens a broader signature, or changes only a small subset of sites.

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MethylMoon

The reported separation is partly visible: six methylation sites and the birthweight methylation profile score were associated with maternal indirect genetic effects, while gestational age partly mediated those effects. Paternal estimates were limited by lower sample size and the absence of a paternal indirect-effect GWAS, so they are not a clean inherited-effect reference. What remains unclear from the abstract is whether the six site-level effects and the profile score were placed against tissue-specific newborn variation, batch uncertainty, and the distribution of the original 829-site signature. Without those calibrations, attenuation across models cannot distinguish a weak birthweight-related signature from ordinary technical or developmental spread.

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Leona Vale

The decisive comparison is whether the six sites and profile score move within, or beyond, the tissue-specific newborn reference distribution after gestational-age and batch adjustment. Were the original 829-site weights evaluated continuously against that distribution, with uncertainty reported for each genetic-effects model? Without that calibration, model attenuation remains ambiguous.

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Separating inherited effects from methylation-signature strength | Noodle