Research Reveals US Self-Reported Race and Ethnicity Don't Accurately Reflect Genetic Ancestry

Recent research utilizing data from the NIH's 'All of Us' Research Program indicates that self-reported race and ethnicity in the United States are unreliable proxies for an individual's actual genetic ancestry. The study analyzed the DNA of over 230,000 volunteers and employed principal component analysis to assess population structure. Findings demonstrated that Americans possess highly mixed ancestries, with their genetic backgrounds often diverging from the racial or ethnic identities they report.

Importantly, this genetic diversity varies regionally across the US, especially among individuals identifying as Hispanic or Latino, who exhibit a wide spectrum of European, Native American, and African ancestries. For instance, Hispanics in the Northeast are more likely to have Caribbean and African heritage, while those in the Southwest tend to have Mexican or Central American ancestry.

The study also uncovered significant associations between genetic ancestry and physical traits such as body mass index (BMI) and height. For example, West and Central African ancestries correlated with higher BMI, whereas East African ancestry was linked with lower BMI. Similarly, individuals with Northern European ancestry were typically taller than those with Southern European roots.

These findings emphasize the limitations of broad racial classifications in medical research and underscore the importance of understanding subcontinental ancestry differences. Recognizing this complexity is vital for advancing precision medicine and tailoring healthcare to individual genetic profiles.

Source: https://medicalxpress.com/news/2025-06-ethnicity-poor-proxies-genetic-ancestry.html