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Modification of brain deoxyribonucleic acid base content with maturation in normal and malnourished rats

N W Penn

    The Biochemical Journal
    |June 1, 1976
    PubMed

    Insights

    Brain DNA shows increased 5-hydroxymethylcytosine with age, but a protein-deficient diet prevents this crucial epigenetic change. This highlights the impact of early nutrition on brain development.

    Area of Science:

    • Epigenetics
    • Neuroscience
    • Developmental Biology

    Background:

    • 5-hydroxymethylcytosine (5hmC) is a key epigenetic modification involved in gene regulation.
    • Changes in DNA methylation patterns, including 5hmC, are critical during brain development.

    Purpose of the Study:

    • To investigate the developmental changes in 5-hydroxymethylcytosine levels in rat brain and liver DNA.
    • To determine the effect of early-life protein restriction on these developmental changes.

    Main Methods:

    • Quantification of 5-hydroxymethylcytosine levels in DNA extracted from rat brains and livers at different ages.
    • Analysis of DNA from rats subjected to an 8% protein diet starting on postnatal day 5.

    Main Results:

    • A 2.2-fold increase in 5-hydroxymethylcytosine mol percentage was observed in adult rat brain DNA compared to 2-day-old rats.
    • Concentrations of 5-hydroxymethylcytosine decreased in corresponding liver DNA preparations.
    • The typical age-dependent rise in brain 5-hydroxymethylcytosine was completely abolished in rats fed an 8% protein diet.

    Conclusions:

    • Brain 5-hydroxymethylcytosine levels increase significantly during postnatal development in rats.
    • Early-life nutritional deficiencies, specifically protein restriction, disrupt normal epigenetic programming in the developing brain.
    • These findings underscore the critical role of adequate nutrition in supporting healthy brain development and epigenetic regulation.

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