Maternal Periconceptional Folic Acid Supplementation and DNA Methylation Patterns in Adolescent Offspring

Area of Science:

• Nutritional epigenetics
• Developmental biology
• Public health

Background:

• Folate is crucial for DNA methylation, a process vital for development.
• Altered DNA methylation patterns during pregnancy are linked to disease and nutritional status.
• The lasting effects of periconceptional folic acid on offspring DNA methylation remain unclear.

Purpose of the Study:

• To investigate the long-term impact of periconceptional folic acid supplementation on adolescent DNA methylation.
• To compare DNA methylation patterns in offspring exposed to folic acid versus unexposed offspring.

Main Methods:

• A follow-up study in China examined DNA methylation in 179 adolescents (ages 14-17) and their mothers.
• Epigenome-wide association analyses assessed DNA methylation at over 400,000 CpG sites.
• Interactions with MTHFR-C677T genotype were analyzed, controlling for confounders.

Main Results:

• No significant differences in epigenome-wide DNA methylation were found between exposed and unexposed adolescents.
• The 5,10-methylenetetrahydrofolate reductase (MTHFR)-C677T genotype did not modify the observed lack of association.
• Results were adjusted for potential confounders, including offspring sex and geographic region.

Conclusions:

• Periconceptional folic acid supplementation at the recommended dosage did not lead to detectable differences in offspring DNA methylation patterns by adolescence.
• These findings suggest no long-term epigenetic alterations in offspring due to early folic acid exposure.