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Study Links Infant Epigenetics, Gut Microbiome Development, and Neurodevelopmental Indicators

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Study Links Infant Epigenetics, Gut Microbiome, and Early Neurodevelopment

A study published on April 10 in the journal Cell Press Blue has identified associations between an infant's epigenetic patterns at birth, the development of their gut microbiome in the first year, and behavioral indicators of neurodevelopment at age three.

The research suggests that early-life factors, including birth mode and feeding practices, are linked to these biological systems, and that specific gut microbes may modify certain associations with early signs of autism spectrum disorder (ASD) and attention-deficit/hyperactivity disorder (ADHD).

Study Methodology

The research involved two primary cohorts of infants:

  • Epigenetic Analysis: DNA methylation patterns, an epigenetic marker, were analyzed from umbilical cord blood samples of 571 infants.
  • Microbiome Analysis: Gut microbiome data was collected from stool samples of 969 infants at 2, 6, and 12 months of age. Microbiome data was also collected from parents during the third trimester of pregnancy.

When the children reached 36 months old, researchers administered a behavioral questionnaire to assess neurodevelopment and investigate potential links to early indicators of ASD and ADHD.

Key Findings on Early-Life Factors

The analysis revealed distinct associations for the infant epigenome at birth and for microbiome development:

Infant Epigenome: Patterns at birth were associated with mode of birth (vaginal or Caesarean section), length of gestation, having older siblings, and maternal allergies. The study found the infant's epigenome was not affected by the gut microbiomes of their parents.

Microbiome Development: The development of an infant's gut microbiome during the first year was associated with mode of birth, antibiotic use, having older siblings, and breastfeeding.

A specific finding noted that infants born by Caesarean section showed different DNA methylation patterns in several genes related to immune responses and brain development compared to those born vaginally.

Interactions Between Epigenetics and the Microbiome

The study indicated that an infant's epigenome at birth can influence subsequent microbiome development. Infants with higher rates of DNA methylation in specific immune genes involved in pathogen recognition developed less diverse gut microbiomes by 12 months of age.

Associations with Neurodevelopmental Indicators

The behavioral assessment at age three revealed associations between early signs of ASD and ADHD and the biological measures studied:

  • Indicators of both ASD and ADHD were associated with specific epigenetic patterns present at birth and with the presence of certain gut microbes during infancy.
  • The research identified that the presence of specific microbial species appeared to mitigate these associations. The species Lachnospira pectinoschiza was linked to a reduced association between certain epigenetic patterns and signs of ASD, while Parabacteroides distasonis was linked to a reduced association with signs of ADHD.

Researcher Statements and Future Directions

In statements provided with the study, researchers commented on the implications and next steps:

Senior author Francis Ka Leung Chan stated that the identification of bacteria that appear to offer protection suggests future possibilities for supporting child development through diet or probiotics.

Co-senior author Hein Min Tun described the interaction as a "conversation," where epigenetic settings at birth can influence risk, but certain gut bacteria may modify that risk. Tun added that while foundations for brain health are laid early, a child's developmental path is not fixed at birth, noting these are complex conditions with many causes.

First author Siew Chien Ng stated the ultimate research goal is to develop safe, early interventions, such as specific probiotics or live biotherapeutics, to help nurture a healthy gut microbiome.

The authors note that laboratory experiments are required to confirm the observed associations between gut microbes and neurodevelopment. The research team is continuing to follow the study participants to observe how early-life factors relate to health in later childhood.

Research Support

The study received funding from InnoHK, the Government of Hong Kong, the D. H. Chen Foundation, and the New Cornerstone Science Foundation.