A researcher is studying the interplay between a specific gene involved in serotonin regulation and life experiences. The gene has two variants: a 'short' version and a 'long' version. The researcher follows three individuals over several years, noting their genetic makeup and their exposure to significant life stressors. Based on the outcomes below, what is the most accurate conclusion the researcher can draw about the relationship between this gene, stress, and the development of depressive episodes?

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A specific genetic factor, an alteration in the 5-HTTLPR gene that regulates serotonin, may act as a diathesis for depression. Research by Caspi et al. (2003) indicates that individuals carrying one or two short versions of this gene are significantly more prone to depressive episodes following multiple stressful life events. Conversely, those with two long versions of the gene appear to be more resilient to the depressogenic effects of stress. This genetic vulnerability alone is not sufficient to cause depression; its impact is contingent upon exposure to stress.

Genetic Vulnerability in Depression: The 5-HTTLPR Gene

A UK-based study by Brown & Harris (2013) provided further evidence for the interaction between the 5-HTTLPR gene and early life stress. The research found that childhood maltreatment before the age of nine significantly increased the risk for chronic adult depression, but only among individuals with one or two short versions of the gene. For those with two long versions of the 5-HTTLPR gene, childhood maltreatment did not elevate their risk of developing chronic depression, highlighting the gene's role in moderating the effects of stress.

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