Prenatal chemical exposure tied to sperm chromosome errors in adulthood

By AI, Created 11:10 AM UTC, May 20, 2026, /AGP/ – A George Mason University-led study links fetal and childhood exposure to PCBs and PFASs with chromosomal abnormalities in sperm decades later. The findings add human evidence that early-life environmental chemicals may affect male fertility and raise the risk of miscarriage and birth defects.

Why it matters: - The study adds human evidence that early exposure to persistent chemicals may affect male reproductive health decades later. - Researchers found a link between prenatal and childhood chemical exposure and sperm aneuploidy, a chromosomal abnormality tied to infertility and pregnancy complications. - Poor sperm quality can raise the risk of miscarriage and congenital birth defects, including Klinefelter syndrome. - The findings could strengthen calls for policies that limit exposure to PCBs and PFASs in food, water and air.

What happened: - George Mason University environmental health epidemiologist Melissa Perry led a study of men ages 22 to 24 whose mothers had blood samples collected during pregnancy from 1986 to 1987. - The research measured PCBs and PFASs in maternal blood and followed the same participants again at ages 7 and 14. - Decades later, the men provided semen samples that researchers assessed for sperm chromosomal abnormalities. - The study was published in Environmental Health in May 2026 under the title “In utero and childhood exposure to organochlorines and perfluorinated chemicals in relation to sperm aneuploidy in adulthood.”

The details: - Sperm normally carry 23 chromosomes and should contain either an X or Y chromosome. - Higher fetal and early-life exposure to PCBs and PFASs was associated with sperm containing extra chromosomes in adulthood. - PCB exposure was linked mainly to an additional Y chromosome. - PFAS exposure was associated with both extra Y and X chromosomes. - Researchers said PCB exposure may have come from a maternal diet that included contaminated seafood. - Researchers said PFAS exposure likely came from environmental pollutants in food, water and air. - Perry said the findings show fetal and later chemical exposures can have an enduring influence on the genetic integrity of sperm. - Perry also said chemical exposure is a public health issue and that policy solutions are needed to prevent these chemicals from entering the environment. - The source release said 7% of all men are affected by infertility.

Between the lines: - The study does not prove the chemicals caused the sperm abnormalities, but it strengthens the case that reproductive harm can begin before birth. - The work extends earlier animal research into human evidence, which may make the findings more relevant for public health and regulation debates. - The results also suggest that adult fertility problems can reflect exposures that happened years earlier, not just current habits or health.

What’s next: - Researchers and public health advocates are likely to press for more studies on how early-life exposure affects fertility across generations. - Perry and co-authors are also positioning the findings as support for policy steps that reduce environmental contamination. - Reporters seeking to interview Perry were directed to media contact Michelle Thompson at mthomp7@gmu.edu. - The study’s contributing authors included researchers from Copenhagen University, The George Washington University, Copenhagen University Hospital, the National Hospital of the Faroe Islands, the University of Faroe Islands and the University of Denmark.

The bottom line: - Early exposure to persistent environmental chemicals may leave a measurable mark on sperm quality well into adulthood, adding human data to a growing concern about reproductive toxicity.