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Neonatal DNA methylation patterns associate with gestational age.

James W Schroeder1, Karen N Conneely, Joseph C Cubells

  • 1Genetics and Molecular Biology Program, Emory University, Atlanta, GA, USA.

Epigenetics
|December 6, 2011
PubMed
Summary
This summary is machine-generated.

Neonatal DNA methylation patterns change with gestational age (GA), potentially impacting infant health. These epigenetic changes, observed even in full-term births, warrant further investigation for clinical significance.

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Area of Science:

  • Epigenetics
  • Neonatal Health
  • Genomics

Background:

  • Adverse neonatal outcomes correlate with reduced gestational age (GA).
  • DNA methylation changes may mediate the link between GA and offspring health.
  • Understanding these epigenetic modifications is crucial for neonatal care.

Purpose of the Study:

  • To investigate the association between gestational age and DNA methylation in neonatal blood.
  • To identify specific genes and CpG sites epigenetically influenced by GA.
  • To validate findings in an independent cohort.

Main Methods:

  • Analyzed over 27,000 CpG sites in neonatal DNA from two cohorts (discovery n=259, replication n=194).
  • Utilized linear mixed-effects models to assess DNA methylation proportion relative to GA.
  • Adjusted for covariates including neonatal sex, race, parity, and birth weight.

Main Results:

  • Identified CpG sites in 39 genes associated with GA in the discovery cohort (FDR < 0.05).
  • Replicated associations for CpG sites in 25 genes in the independent cohort, with consistent directionality.
  • Associated genes are involved in labor/delivery (e.g., AVP, OXT) and later-life health risks (e.g., DUOX2, CASP8).

Conclusions:

  • Neonatal DNA methylation exhibits variability with gestational age, even in term deliveries.
  • Epigenetic alterations linked to GA may influence neonatal health and long-term outcomes.
  • Further research is needed to explore the clinical implications of these GA-associated methylation changes.