Epigenetic mechanisms play a crucial role in mediating the relationship between childhood poverty and long-term cognitive outcomes by altering gene expression without changing the underlying DNA sequence. Poverty-related stressors, such as malnutrition, exposure to toxins, chronic stress, and limited access to healthcare, can trigger epigenetic modifications that affect brain development and cognitive function.
One key epigenetic mechanism is DNA methylation, where methyl groups are added to DNA, typically suppressing gene expression. Studies have shown that children exposed to poverty exhibit altered DNA methylation patterns in genes related to stress response, immune function, and brain development. For example, the glucocorticoid receptor gene (NR3C1), which regulates the body's response to stress, can become hypermethylated in children experiencing chronic stress due to poverty. This hypermethylation reduces the expression of NR3C1, leading to an impaired stress response system. Consequently, these children may exhibit heightened anxiety, increased susceptibility to mental health disorders, and cognitive deficits, such as impaired memory and executive functions.
Histone modification is another important epigenetic mechanism. Histones are proteins around which DNA is wrapped, and modifications like acetylation and methylation can alter the accessibility of DNA to transcription factors. Childhood poverty ....
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