Early-life environmental and genetic stressors have been linked to the development of type 1 diabetes mellitus (T1DM). A longitudinal analysis published in BMJ Open Diabetes Research & Care examined whether epigenetic age acceleration (EAA) changes in children at high risk for T1DM before the onset of islet autoimmunity.

The study analyzed DNA methylation data from 2547 children enrolled in the Diabetes Autoimmunity Study in the Young cohort, born between 1993 and 2006 and genetically at risk for T1DM. Epigenetic age was estimated using a DNA methylation-based epigenetic clock developed for pediatric blood samples. The analysis focused on 85 children who developed T1DM and 85 matched controls, with measurements taken before and after islet autoimmunity seroconversion, a preclinical stage of the disease.

Changes in EAA differed significantly between cases and controls (p = 0.02). Among children who later developed T1DM, EAA declined by 0.367 units from pre-islet autoimmunity to post-seroconversion (95% CI −0.64 to 0.09; p = 0.01). In contrast, controls showed no significant change (0.045; 95% CI 0.23 to 0.32; p = 0.75).

These findings suggest that alterations in epigenetic aging occur before islet autoimmunity develops in children who progress to T1DM, supporting a potential role for early environmental stressors in disease pathogenesis.