Characteristics of epigenetic aging across gestational and perinatal tissues.
Level 3 - non-randomized controlled study
Observational analysis across two independent birth/perinatal cohorts
PubMed 33926514 · doi:10.1186/s13148-021-01080-y
What was done
The authors evaluated gestational epigenetic age acceleration and deceleration (the deviation between DNA methylation-estimated age and chronological gestational age) across chorionic villus, placenta, and cord blood samples. Data were analyzed from two independent cohorts: ITU (n = 639) and PREDO (n = 966). The study assessed which birth- and pregnancy-related factors predicted epigenetic age deviations in each tissue and evaluated whether epigenetic age deviations correlated across different tissues from the same individual.
What was found
The abstract reports no numerical effect sizes, test statistics, or correlation coefficients. Predictors of epigenetic age deviations included child sex, birth length, maternal smoking during pregnancy, maternal mental disorders until childbirth, delivery mode, and parity. However, the specific predictor variables and their directions of association varied across tissues. In individuals with multiple tissue samples available, relative epigenetic age deviations were not correlated across tissues.
Why it matters
This study indicates that perinatal epigenetic clocks capture tissue-specific biological characteristics rather than a single, organism-wide measure of newborn biological age. Researchers using neonatal epigenetic clocks must account for tissue type when interpreting gestational age acceleration or environmental exposures.
Limits
The abstract provides purely qualitative summaries without numerical data, effect sizes, p-values, or correlation coefficients. The number of multi-tissue matched samples per individual is not specified, and long-term health outcomes related to these tissue-specific epigenetic deviations were not evaluated.
Cited by
- supports DNA methylation clocks developed for placental tissue can estimate the gestational age of a newborn.