Why in News?
The exposome is in the news because, scientists at the AAAS Annual Meeting announced a major global effort to map the "Human Exposome." This ambitious initiative aims to identify the lifelong environmental and chemical exposures that drive an estimated 80% of human diseases, ranging from air pollution to microplastics.
About
- Global Mapping Launch: Scientists are launching the Human Exposome Project (HEP), a massive international collaboration to decode the "hidden 80%" of disease causes not explained by genetics.
- UNESCO Partnership: On 8 December 2025, a formal partnership was initiated between the Global Exposome Forum, UNESCO, and the Human Cell Atlas to integrate exposomics into global science policy.
- Policy Shift: Experts are calling for a shift in public health from a "one-product-one-regulation" model to one that considers the cumulative effect of chemical mixtures on human health.
Key Information
- Definition: Coined in 2005 by Dr. Christopher Wild, the exposome represents the totality of exposures an individual experiences from conception to death and how they impact health.
- Three Domains of Exposure:
- Internal: Biological processes like metabolism, hormones, inflammation, and the gut microbiome.
- Specific External: Direct external factors such as diet, tobacco use, occupation, infectious agents, and pollutants.
- General External: Broader social and environmental context, including climate, urban/rural environment, and socioeconomic status.
- Exposomics: The emerging field that studies the exposome using high-tech tools like wearable sensors, satellite data, and "omics" (genomics, metabolomics, etc.) to link environmental contact with molecular changes.
- Scientific Significance: Research shows that genetics alone accounts for only about 10–20% of chronic diseases (like cancer, diabetes, and heart disease), while the remaining burden is caused by environmental factors.
- Innovation – Adductomics: A new technique that measures "adducts" (chemical markers left on blood proteins) to act as a biological sensor of past exposures that cannot be measured directly.
- India's Context: India faces a high environmental disease burden (nearly 25% globally); adopting exposomics is seen as a key step for early disease prediction and cost-effective preventive care in the country.
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