Researchers have identified a blood-based DNA marker that tracks arsenic exposure in the human body. This discovery offers scientists a tool to monitor people at risk and predict who will develop arsenic-related illnesses.
More than 200 million people worldwide drink arsenic-contaminated water. Long-term exposure causes cancer, heart disease, and other chronic conditions, yet doctors lacked a reliable method to measure exposure levels or forecast individual health outcomes.
The new DNA marker changes this. By detecting specific changes in blood samples, scientists can now quantify how much arsenic a person has absorbed over time. This biomarker also appears to predict toxicity risk, meaning doctors could identify vulnerable patients before serious illness develops.
The work matters because arsenic exposure spans the globe. Contaminated wells in Bangladesh, India, and parts of the United States affect millions. Currently, physicians rely on incomplete exposure histories and general population data rather than precise individual measurements.
Next steps involve larger clinical studies to validate the marker across diverse populations and confirm its predictive power. Researchers also plan to understand the biological mechanisms linking arsenic exposure to disease. If validated, the test could become standard screening in high-risk regions, enabling early intervention and better disease prevention strategies.