Cumulative psychosocial factors and epigenetic age acceleration in the Hispanic Community Health Study/Study of Latinos

Hispanics/Latinos in the United States experience disproportionately high psychosocial factors compared to non-Hispanic/Latino Whites. Psychosocial factors may accelerate biological aging, measured by epigenetic age acceleration (EAA), a DNA methylation biomarker predictive of morbidity and mortality. We investigated the cumulative impact of psychosocial factors on EAA over time in 922 adults from the Hispanic Community Health Study/Study of Latinos (HCHS/SOL). Psychosocial exposure profiles were derived using self-organizing maps (SOM), an unsupervised clustering method. We calculated EAA from whole blood DNA methylation at two timepoints using GrimAge and DunedinPACE. SOM identified four clusters: Cluster 1 (n = 196; 21.3%) had high levels of all psychosocial factors; Cluster 2 (n = 250; 27.1%) exhibited chronic, traumatic, and childhood stress; Cluster 3 (n = 250; 27.1%) showed mental health symptoms, low social support, and high perceived stress; and Cluster 4 (n = 238; 24.5%) had relatively low psychosocial stress. Adjusted weighted linear mixed models exhibited increased GrimAge in Cluster 1 (1.27 years, 95% CI: 0.57,1.97) and Cluster 2 (0.62 years, 95% CI: 0.01,1.23) compared to Cluster 4. DunedinPACE increased 3% (95% CI: 0.01,0.05) and 2% (95% CI: 0.001,0.04) in Clusters 1 and 3, respectively. These findings highlight the cumulative impact of psychosocial factors on EAA and how stressors can get "under the skin" and contribute to health disparities.