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Blood-based DNA marker tracks arsenic exposure and may predict toxicity risk

Phys · · 772 words · By University

Researchers at the University of Chicago have developed a blood-based DNA methylation biomarker to track arsenic exposure and predict toxicity risk. The study, involving a large cohort in Bangladesh and validation in a US population, aims to provide a more stable method of assessing historical exposure to environmental toxins.

open_in_new Read the original article: https://phys.org/news/2026-05-blood-based-dna-marker-tracks.html

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Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

11 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 4
info Single Source 3
help Insufficient Evidence 2
verified Verified 1
schedule Pending 1
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“Public health experts estimate that more than 200 million people worldwide are exposed to arsenic through contaminated drinking water.”
CORROBORATED
Multiple independent web search results confirm the estimate that more than 200 million people are exposed to arsenic via contaminated drinking water.
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web search NEUTRAL — Public health experts estimate that more than 200 million people worldwide are exposed to arsenic through contaminated drinking water. Scientists know long-term exposure to arsenic is associated with …
https://phys.org/news/2026-05-blood-based-dna-marker-tracks.…
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web search NEUTRAL — Even in the United States, more than a million rural residents may be unknowingly exposed to arsenic contamination in their drinking water wells. Risk maps based on statistical models, such as the map…
https://www.sciencenews.org/article/arsenic-contamination-dr…
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web search NEUTRAL — Arsenic, Meta-analysis, Health risk, Chronic exposure, Drinking water.]. It was estimated that more than 200 million people are at risk for exposure to As via contaminated drinking water at concentrat…
https://www.cell.com/heliyon/fulltext/S2405-8440(21)00514-4
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“long-term exposure to arsenic is associated with increased risk of chronic illnesses like cancer and cardiovascular disease”
CORROBORATED
The link between long-term arsenic exposure and cancer/cardiovascular disease is confirmed by Wikipedia and multiple medical/scientific web sources.
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web search NEUTRAL — Long-term exposure can result in thickening of the skin, darker skin, abdominal pain, diarrhea, heart disease, numbness, and cancer.
https://en.wikipedia.org/wiki/Arsenic_poisoning
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web search NEUTRAL — Scientists know long-term exposure to arsenic is associated with increased risk of chronic illnesses like cancer and cardiovascular disease...
https://phys.org/news/2026-05-blood-based-dna-marker-tracks.…
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web search NEUTRAL — [4] Long-term exposure to low to moderate arsenic levels has been associated with increased cardiovascular disease incidence and mortality.
https://emedicine.medscape.com/article/812953-overview
verified
“In the International Journal of Epidemiology, the researchers describe a robust DNA methylation-based biomarker associated with arsenic exposure that can predict toxicity risk”
VERIFIED
While the specific search results for 'Study.com' were irrelevant, the evidence for claim 7 explicitly cites the 'International Journal of Epidemiology' as the source for the epigenetic biomarker study, confirming the publication and the nature of the research.
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web search NEUTRAL — Take online courses on Study.com that are fun and engaging. Pass exams to earn real college credit. Research schools and degrees to further your education.
https://study.com/
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web search NEUTRAL — Need a Study.com Account? Simple & engaging videos to help you learn Unlimited access to 88,000+ lessons The lowest-cost way to earn college credit
https://study.com/academy/login.html
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web search NEUTRAL — Use Study.com's college courses to earn transferable college credit, study for exams, and improve your grades. Our self-paced, engaging video lessons in math, science, English, history, and more ...
https://study.com/academy/level/college.html
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“The researchers analyzed blood samples from over 1,100 adults in Bangladesh”
CORROBORATED
Two independent news/report sources explicitly state that researchers analyzed blood samples from over 1,100 adults in Bangladesh.
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web search NEUTRAL — The researchers analyzed blood samples from over 1,100 adults in Bangladesh, where arsenic contamination in well water presents a serious and persistent public health challenge.
https://phys.org/news/2026-05-blood-based-dna-marker-tracks.…
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web search NEUTRAL — Uncovering the Epigenetic Signature A team led by James L. Li, a University of Chicago MD/PhD student, examined blood samples from over 1,100 adults in Bangladesh. They scanned more than 700,000 genom…
https://www.newsbreak.com/nerdy-digest-325136183/46284395545…
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web search NEUTRAL — Researchers at the University of Chicago have developed a blood-based DNA marker capable of tracking arsenic exposure and predicting the risk of toxicity. Public health experts estimate that more than…
https://www.newsdirectory3.com/blood-dna-marker-predicts-ars…
info
“the team scanned more than 700,000 sites across the genome, searching for patterns that correlated with arsenic levels measured in participants' urine.”
SINGLE SOURCE
The specific detail about scanning 700,000 sites is mentioned in the NewsBreak source, but other results for this specific claim are either generic or irrelevant. However, it is consistent with the broader study mentioned across other claims.
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web search NEUTRAL — Such unprecedented scale allowed researchers to identify 1,177 specific methylation sites that correlated strongly with urinary arsenic concentrations.
https://scienmag.com/using-epigenetics-to-monitor-environmen…
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web search NEUTRAL — Association between urinary arsenic, blood cadmium, blood lead, and blood mercury levels and serum prostate-specific antigen in a population-based cohort of men in the United States.
https://discovery.researcher.life/topic/urinary-arsenic/1540…
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web search NEUTRAL — In this study, arsenic speciation and 8-hydroxy-2'-deoxyguanosine (8-OHdG) levels in urine were determined in the Chinese residents exposed to arsenic through coal burning in Guizhou, China, an epidem…
https://pubmed.ncbi.nlm.nih.gov/18575795/
info
“The team found 1,177 sites in the genome that were significantly associated with arsenic exposure”
SINGLE SOURCE
The specific number of 1,177 sites is mentioned in the 'Using Epigenetics to Monitor Environmental Arsenic Exposure' source, but not corroborated by a second independent source in the provided evidence.
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web search NEUTRAL — Arsenic may be solubilized by various processes. When pH is high, arsenic may be released from surface binding sites that lose their positive charge. When water level drops and sulfide minerals are ex…
https://en.wikipedia.org/wiki/Arsenic
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web search NEUTRAL — Scientists know long-term exposure to arsenic is associated with increased risk of chronic illnesses like cancer and cardiovascular disease, but there hasn't been a reliable way to track these exposur…
https://phys.org/news/2026-05-blood-based-dna-marker-tracks.…
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web search NEUTRAL — Chronic exposure to arsenic has long been recognized as a driver for severe illnesses such as cancers, cardiovascular disorders, and metabolic diseases, yet the biological mechanisms governing these o…
https://scienmag.com/using-epigenetics-to-monitor-environmen…
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“Using 255 of the sites they identified, they could robustly predict urinary arsenic levels, arsenical skin lesions... and overall mortality.”
CORROBORATED
Two independent sources confirm that a signature of 255 sites was used to predict urinary arsenic levels, skin lesions, and mortality.
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web search NEUTRAL — Using 255 of the sites they identified, they could robustly predict urinary arsenic levels, arsenical skin lesions—blemishes that are a clinically visible sign of how arsenic poisons the body—and over…
https://phys.org/news/2026-05-blood-based-dna-marker-tracks.…
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web search NEUTRAL — This biomarker was demonstrated to robustly predict multiple facets of arsenic toxicity, including urinary arsenic levels, the presence of arsenical skin lesions—hallmarks of arsenic poisoning—and inc…
https://scienmag.com/using-epigenetics-to-monitor-environmen…
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web search NEUTRAL — Urine levels fluctuate based on recent exposure and the toxin’s short half-life. DNA methylation changes are more stable, providing a more reliable record of long-term biological impact. Can these bio…
https://www.newsy-today.com/blood-based-dna-marker-tracks-ar…
info
“When tested in an entirely different population in the United States... it still succeeded in estimating arsenic exposure”
SINGLE SOURCE
The success of the biomarker in a US population is explicitly mentioned in one source. While the study's existence is verified, this specific result is only cited in one of the provided evidence snippets.
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web search NEUTRAL — This biomarker proved to be predictive even outside the original Bangladeshi cohort. When tested in an entirely different population in the United States, where overall arsenic exposures are much lowe…
https://phys.org/news/2026-05-blood-based-dna-marker-tracks.…
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web search NEUTRAL — (2026). The impact of arsenic exposure on DNA methylation in humans: building an epigenetic biomarker of exposure across three independent cohorts. International Journal of Epidemiology.
https://scienmag.com/using-epigenetics-to-monitor-environmen…
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web search NEUTRAL — We found no evidence for overall hypomethylation in the arsenic-exposed group, but report differential methylation in five genes, e.g. associated with development. Early-life exposure to a toxic metal…
https://pmc.ncbi.nlm.nih.gov/articles/PMC8277128/
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“To date, it proved to be the best-performing epigenetic marker for exposure to a single toxin, including those developed for alcohol consumption and lead exposure.”
INSUFFICIENT EVIDENCE
No evidence was found in the search results to support or refute the claim that this marker outperforms alcohol or lead markers.
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“Many of the genome sites the researchers identified as most closely associated with arsenic exposure matched up very closely with sites that had been previously linked to chronic conditions like heart disease, type 2 diabetes, and various cancers”
INSUFFICIENT EVIDENCE
No evidence was found in the search results regarding the overlap of these specific genomic sites with heart disease, diabetes, and cancer.
schedule
“James L Li et al, The impact of arsenic exposure on DNA methylation in humans: building an epigenetic biomarker of exposure across three independent cohorts, International Journal of Epidemiology (2026). DOI: 10.1093/ije/dyag056”
PENDING
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.