Methylation is the process of adding a methyl group to specific segments of a gene. It quietly influences gene expression, determining which genes are activated and which are paused.
Recent research explores how Early Life Stress (ELS) affects a person's future resistance to mental illness—also known as "resilience"—by changing the methylation of a gene called NR3C1.
The NR3C1 gene is responsible for producing glucocorticoid receptors, which act like the body's stress regulators. When a person feels stressed, the body secretes a stress hormone called cortisol. Normal glucocorticoid receptors bind with cortisol to form a negative feedback loop. Much like "hitting the brakes," this allows the body's stress response to stop at the appropriate time.
Studies show that when the methylation level of the NR3C1 gene increases, it leads to a decrease in the production of glucocorticoid receptors. This weakens the "brake" function, keeping the body in a high-cortisol state for a long time and increasing the risk of stress-related diseases.
Some studies also indicate that for people who have experienced early life trauma, if their NR3C1 gene has a higher level of methylation, their risk of developing mental illnesses such as depression or anxiety later in life may also increase.
Childhood experiences may leave "marks" at the molecular level, affecting a person's ability to cope with stress throughout their entire life.
References:
- Forum, D. M. K., Bjerregaard, C., & Thomsen, P. H. (2025). The significance of DNA methylation of the NR3C1 gene encoding the glucocorticoid receptor for developing resilience in individuals exposed to early life stress. Nordic Journal of Psychiatry, 79(1), 1-14.
- McGowan, P. O., Sasaki, A., D'alessio, A. C., Dymov, S., Labonté, B., Szyf, M., ... & Meaney, M. J. (2009). Epigenetic regulation of the glucocorticoid receptor in human brain associates with childhood abuse. Nature neuroscience, 12(3), 342-348.