A Duke study suggests that small RNA molecules circulating in the blood can predict how long older adults will live. Working with samples from more than 1,000 North Carolinians aged 71 and older, tested over a ten-year period, the team identified piRNAs whose levels forecast whether participants would survive a further two, five or ten years. The findings were published in the journal Aging Cell.
The direction of the result is arresting: fewer circulating piRNAs were associated with longer life. Co-lead investigator Virginia Byers Kraus and colleagues also found that people with lower piRNA levels tended to be more physically active, whether through travel, chores around the home or formal exercise, hinting at a biological thread connecting everyday movement to the molecular signature of ageing in the blood.
Methodologically, the team used a causal artificial intelligence approach designed to single out factors that may actually drive survival rather than merely accompany it. The next steps are ambitious: testing whether lifestyle changes, treatments or medications such as GLP-1 drugs can shift piRNA levels, and extending the research to North Carolinians from their thirties through to age 100.