Association Between Maternal Gestational Diabetes, Cord Blood DNA Methylation, and Offspring Neurodevelopment

Area of Science:

• Epigenetics
• Neuroscience
• Developmental Biology

Background:

• Gestational diabetes mellitus (GDM) affects maternal metabolism during pregnancy.
• The impact of maternal GDM on infant neurodevelopment and its underlying epigenetic mechanisms are not well understood.

Purpose of the Study:

• To investigate the association between fetal DNA methylation and neurodevelopmental outcomes in children exposed to maternal GDM.
• To explore potential epigenetic signatures at birth linked to GDM exposure and subsequent neurodevelopment.

Main Methods:

• Prospective, observational pilot cohort study comparing GDM-exposed and unexposed infants.
• Targeted methylome sequencing of umbilical cord blood DNA (3.34 million CpG sites).
• Neurodevelopmental assessment at age two years using Bayley-III Scales; bioinformatics analysis of differentially methylated regions (DMRs).

Main Results:

• Infants of mothers with GDM exhibited lower cognitive, language, and motor scores.
• 1053 DMR-associated genes converged on pathways for neurogenesis, synaptic components, and axonal guidance.
• Specific DNA methylation signatures in genes like WNT4, PCDHG, PALM, FOXF2, CHFR, FSTL3, and H6PD correlated with neurodevelopmental outcomes and potential blood-brain barrier/metabolic influences.

Conclusions:

• Intrauterine exposure to maternal GDM is associated with distinct fetal DNA methylation patterns at birth.
• These epigenetic modifications are potentially linked to altered neurodevelopmental trajectories in offspring.
• Findings provide a basis for further research into GDM's long-term neurodevelopmental effects via epigenetic mechanisms.