Early exposure to a methyl donor supplemented diet and the development of repetitive motor behavior in a mouse model

Area of Science:

• Neuroscience
• Developmental Biology
• Epigenetics

Background:

• Repetitive motor behaviors are common in neurodevelopmental disorders like autism spectrum disorder.
• C58 mice show high levels of repetitive behavior in restricted environments, suggesting epigenetic involvement.
• DNA methylation is a key epigenetic mechanism potentially influencing these behaviors.

Purpose of the Study:

• To investigate if early exposure to a methyl donor supplemented diet alters the development of repetitive motor behavior in C58 mice.
• To determine the role of DNA methylation in mediating environmental effects on repetitive behavior.

Main Methods:

• Administered a methyl donor supplemented diet to C58 mice during gestation and preweaning periods.
• Assessed repetitive motor behavior frequency and temporal structure from early development through adulthood.
• Measured DNA methylation levels in brain tissue, particularly in female mice.

Main Results:

• Early methyl donor diet exposure significantly attenuated the development of repetitive motor behaviors.
• The reduction in repetitive behaviors persisted into early adulthood, even on a standard diet.
• Dietary intervention altered the temporal structure of repetitive behaviors, increasing variability.
• Long-lasting increases in DNA methylation were observed in the brain tissue of female mice exposed to the diet.

Conclusions:

• Early life nutritional interventions, specifically methyl donor supplementation, can modify the trajectory of repetitive motor behaviors.
• DNA methylation alterations in early development may be a crucial mechanism linking environmental factors to behavioral outcomes in neurodevelopmental contexts.
• This study provides evidence for the role of epigenetic modifications in the development of repetitive behaviors, offering potential targets for intervention.