Childhood Adversity and Telomere Length.

Exposure to adversity during childhood and adolescence is associated with numerous health conditions in adulthood; telomere shortening may be a mechanism through which adversity contributes to poor outcomes. We studied three areas of adversity (parent relational instability, child household instability, and financial instability) occurring during three epochs across childhood and adolescence and their associations with telomere length during adolescence. Data were obtained from the first wave of a longitudinal cohort study of youth aged 11-17 and their primary caregiver. Caregivers completed demographic and adversity questionnaires; youth provided a saliva sample for DNA extraction for telomere analysis. Of 879 youth, over half experienced some adversity. More than one third experienced parent relational instability in each age epoch, with nearly a quarter experiencing parent relational instability in all age epochs. Youth experienced a similar pattern of financial instability but lower rates of child household instability. Youth experiencing parent relational instability at two or three epochs had shorter telomeres compared to those without any parent relational instability ( < .004). Youth who experienced child household instability in two age epochs had shorter telomeres ( = .003) and youth who experienced financial instability across all three epochs had shorter telomeres ( = .013) compared to youth without these adversities. Continuing exposure to adversity in early childhood may be more likely to affect telomere length. Research is needed to further determine adversities exerting the most effect and to understand if early telomere shortening has long term health effects.