Paquette, Alison G, Marsit, Carmen J · Journal of cellular biochemistry · 2014 · DOI
This article examines how a gene called HTR2A, which helps control serotonin (a brain chemical), can be chemically modified in ways that affect brain development and mental health. Researchers found that these modifications can happen before birth—even in the placenta—and may influence how our brains develop, potentially affecting conditions like depression, anxiety, and other mental health disorders. The article suggests these changes might also be linked to chronic fatigue syndrome, though more research is needed to understand how and why.
ME/CFS patients frequently experience psychiatric comorbidities and central nervous system dysregulation, making serotonergic mechanisms highly relevant. This review connects early-life epigenetic changes to lifelong neurobiological outcomes, suggesting that understanding HTR2A regulation could explain some ME/CFS patients' mental health symptoms and inform potential therapeutic targets. The focus on placental programming also opens avenues for understanding how prenatal factors might contribute to ME/CFS susceptibility.
This perspective article does not prove that HTR2A methylation causes ME/CFS or psychiatric disorders—it primarily reviews associations found in other studies. The review does not establish whether epigenetic changes are primary drivers of disease or secondary consequences, nor does it determine causality in the relationship between placental HTR2A regulation and adult outcomes. Cross-tissue applicability remains unclear; placental findings may not directly translate to central nervous system mechanisms in ME/CFS.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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