https://gizmodo.com/genetics-research-is-failing-most-of-the-worlds-populat-1824032089
The epidemic seemed to be hitting African Americans and Latinos especially hard. And, at the time, research suggested that asthma not only occurred at a higher rate within these populations, but they also seemed to get sicker.
“For reasons not entirely clear, the asthma burden is falling heaviest on minorities, especially those living in urban poverty,” the Boston Globewrote in a major 1999 story.
Burchard, though, had a clue about what might be happening, and it wasn’t just that African Americans and Latinos lived in places with poorer air quality or lacked access to good health care. Part of the disparity, he thought, was genetic. In 1999, he co-authored a paper that revealed a variant in the gene IL-4 seemed to be associated with asthma severity and was 40 percent more common among African Americans. A Latino himself, he also knew that many Latinos have African ancestry.
“Every variant linked to a trait is likely to be ancestry-specific,” Eric Topol, a geneticist at Scripps Research Institute, told Gizmodo. “There aren’t that many things in the genome that are truly cosmopolitan.”
Sequencing the human genome has shown us that we are mostly all made up of the same stuff, but it’s the tiny variations in our coding that account for huge variations among people. In his most recent study, published earlier this month, Burchard’s team at UCSF sequenced the entire genomes of 1,441 African American and Latino children with asthma and found a genetic variant that may be responsible for why the most popular asthma medication on the market, albuterol, often does not work for black and Latino children. Knowing whether someone has that genetic variant could determine how well they respond to a drug, which could in turn mean life or death.
The promise of personalized medicine is to exploit the variations in our genome, tailoring treatments and assessing risk of disease based on specific genes. But modern science has so far mostly ignored that those variations sometimes fall along ancestral lines.
Topol put it bluntly: “Your chances of there being existing genetic research relevant to you and your health are better if you are of European ancestry.”
One 2016 analysis found that 81 percent of participants in genome-wide association studies were of European descent. That number is grave when you consider the findings of the few scientists like Burchard who are studying the other 20 percent. The truth is that if you are black, Latino, or a member of an indigenous population, we just don’t know all that much about your specific genes. It is discrimination embedded deep in the annals of medicine, a slight resurfaced with every journal article that includes the disclaimer that the study population was of “mostly European descent.”