Oocyte age and preconceptual alcohol use are highly correlated with epigenetic imprinting of a noncoding RNA ( nc886 ).
Level 3 - non-randomized controlled study
Observational cohort study analyzing maternal exposures and infant epigenetic outcomes
PubMed 33723081 · doi:10.1073/pnas.2026580118
What was done
Researchers assessed tissue concordance of DNA methylation at the *nc886* (*VTRNA2-1*) differentially methylated region (DMR) to determine imprint stability across development. They then analyzed associations between newborn imprinting status at this locus and maternal factors—specifically maternal age, preconceptional alcohol consumption, and preconceptional cigarette smoking—in a cohort of over 1,100 mother-child pairs from South Africa.
What was found
Imprinting at the *nc886* DMR was consistent across different tissues within individuals. Newborn imprinting frequency increased with older maternal age and decreased among mothers who reported alcohol consumption prior to conception. Cigarette smoking before conception showed no apparent relationship with imprinting frequency. Specific numerical effect sizes, percentages, and p-values were not reported in the abstract.
Why it matters
These findings suggest that human genomic imprints established in the oocyte before fertilization can be influenced by maternal age and preconceptional environmental exposures like alcohol, expanding concerns about alcohol exposure beyond pregnancy alone.
Limits
The abstract provides no numerical data, odds ratios, or confidence intervals. Exposure levels (dose, duration, and exact timing of alcohol and tobacco use) are not detailed and likely rely on retrospective self-report. Causality cannot be established from observational cohort data, and downstream clinical consequences for child health were not assessed.
Cited by
- supports Children of mothers who consumed alcohol are less likely to have genomic imprinting at the non-coding RNA nc886.