Researchers have found that the words that scientists use to describe human populations — such as race, ancestry, and ethnicity — significantly changed from 1949 to 2018. Such changes and their timing, along with new descriptors for certain population groups, may be linked to structural racism, social trends, and how people view social constructs such as race.

The study results show that the term «race» is now used less on its own but is used more when paired with «ethnicity.» In addition, the use of «ancestry» and «ethnicity» also has increased. The survey, which was led by researchers at the National Human Genome Research Institute (NHGRI), part of NIH, was published today in the American Journal of Human Genetics.

For the field of genetics, the question of what makes a population is a fundamental one. Accurately describing human diversity has a direct impact on our understanding of genomic variation among people, and in turn, how such variation influences our health. Historically, scientists have often incorrectly conceptualized races as distinct biological groups, which has led to health inequities and supported scientific racism.

Many scientists rightly reject the idea of racial and ethnic categories as biological units. Now, in the field of genomics, ancestry, ethnicity and race are used as inexact proxies for genomic ancestry. But scientists still disagree on how these terms should be used and understood.

«Given how ubiquitous these terms are, we wanted to empirically study the historical use of these concepts in the context of genetics and genomics research,» said Vence Bonham Jr., J.D., senior author on the study and acting deputy director of NHGRI.

Specifically, the researchers studied the usage of population terms in the 70-year publication history of the American Journal of Human Genetics, whichis the longest continuously published journal in the field of human genetics. They searched the text of journal articles to identify when «ancestry,» «ethnicity,» «race» and other related words began to be used, whether they appeared together, and which terms were slowly used less frequently. Of the 11,635 papers analyzed in the study, 11,360 were research articles, with the rest being award speeches and other communications.

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Materials provided by NIH/National Human Genome Research Institute. Original written by Prabarna Ganguly, Ph.D.. Note: Content may be edited for style and length.