Potential Epigenetic Effects of Human Milk on Infants' Neurodevelopment

Area of Science:

• Perinatology
• Developmental Neuroscience
• Epigenetics

Background:

• Human milk feeding offers significant advantages for infant health, including reduced non-communicable disease risk and enhanced neurodevelopmental outcomes.
• The exact mechanisms linking human milk to infant neurodevelopment are not fully understood, but epigenetic influences are a key area of investigation.
• Breast milk contains bioactive components such as non-coding RNAs, stem cells, and microbes that may play a crucial role.

Purpose of the Study:

• To review the current understanding of how human milk feeding impacts infant neurodevelopment through epigenetic pathways.
• To explore the roles of specific bioactive components in breast milk, including non-coding RNAs, stem cells, and microbiota, in modulating brain development.
• To highlight the potential epigenetic effects of breast milk on both full-term and preterm infants.

Main Methods:

• This study is a narrative review, synthesizing existing research on breast milk, epigenetics, and infant neurodevelopment.
• Literature search focused on studies investigating bioactive components of human milk and their impact on brain development and function.
• Analysis of mechanisms by which non-coding RNAs, stem cells, and breast milk microbiota may influence neurodevelopment via epigenetic modifications.

Main Results:

• Non-coding RNAs within milk exosomes and breast milk stem cells can survive digestion, enter circulation, and cross the blood-brain barrier.
• Non-coding RNAs may regulate genes crucial for brain development and function, while stem cells can differentiate into neural cells or act as epigenetic regulators.
• Breast milk microbiota contributes to the infant gut microbiome, influencing brain development through epigenetic changes and molecular regulation.

Conclusions:

• Breast milk's bioactive components, particularly non-coding RNAs and stem cells, possess the potential to epigenetically influence infant neurodevelopment.
• The gut microbiome, established by breast milk microbiota, is another critical pathway through which breast milk impacts brain development.
• Understanding these epigenetic mechanisms provides insight into the profound benefits of human milk feeding for neurodevelopment in all infants, including vulnerable preterm babies.