Histone H3 lysine 4 methylation signature associated with human undernutrition

Area of Science:

• Epigenetics
• Developmental Biology
• Nutritional Science

Background:

• Childhood stunting, resulting from poor nutrition and pathogen exposure, leads to lifelong health issues.
• The epigenetic mechanisms underlying stunting in early childhood remain largely unexplored.
• Parental history may also influence a child's susceptibility to stunting.

Purpose of the Study:

• To investigate the epigenetic impact of environmental factors on children experiencing stunting.
• To characterize the dynamic changes in histone H3 lysine 4 trimethylation (H3K4me3) in stunted children and their mothers.
• To identify specific genes and pathways affected by these epigenetic modifications.

Main Methods:

• Analysis of histone H3 lysine 4 trimethylation (H3K4me3) patterns in blood cells of stunted children and mothers.
• Comparison of H3K4me3 patterns with histone H3 lysine 27 acetylation.
• Gene expression profiling to identify differentially expressed genes and affected pathways.
• Utilizing a mouse model to validate findings related to gene expression and stunting.

Main Results:

• A distinct pattern of H3K4me3 redistribution was observed in stunted children, with decreased methylation at gene start sites and increased methylation at ectopic sites.
• These changes specifically affected metabolic and immune genes and were unique to H3K4me3, not histone H3 lysine 27 acetylation.
• Gene expression analysis revealed impacts on chromatin modification machinery, immune response pathways, and lipid metabolism.
• Reduced expression of the LDL receptor 1 (LRP1) gene was identified as a driver of stunting in a mouse model.

Conclusions:

• Epigenetic alterations, specifically H3K4me3 redistribution, are associated with childhood stunting.
• Reduced one-carbon nutrients in the diet may contribute to these observed methylation changes.
• Interventions targeting genes like LRP1 could offer potential therapeutic strategies for stunting.