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Black Death survivors' genetic characteristics are related to autoimmune illnesses today.

The 14th-century epidemic was significantly more likely to be survived by those having the ERAP2 mutation, according to researchers.

Scientists have discovered genetic characteristics that, more than 700 years ago, decided who would survive the Black Death but are now linked to a higher risk of developing several autoimmune disorders.

People with what the researchers refer to as a "good" form of a specific gene, known as ERAP2, survived at significantly greater rates, according to a study of centuries-old DNA from victims and survivors of the bubonic plague that struck Europe in the 14th century.

The research, which is detailed in the journal Nature, illuminates how the Black Death, which wiped out nearly 50% of the population of Europe, influenced the evolution of immunity genes like ERAP2, influencing how people today respond to sickness.

The "selectively favourable" ERAP2 variant has also been linked to other autoimmune disorders and is a known risk factor for Crohn's disease, according to the researchers.

The Black Death had a significant selection pressure on the evolution of the human immune system, according to Luis Barreiro, professor of genetic medicine at the University of Chicago Medical Center in the US and a co-senior author of the study.

In order to conduct the study, more than 500 ancient DNA samples were taken from human remains, including those interred in the East Smithfield plague pits in London, which served as mass graves in 1348 and 1349. The samples were from individuals who either passed away prior to the disease, perished from it, or survived the Black Death.

Then, it was checked for any indications of any genetic adaptation connected to the plague, which is brought on by the bacteria Yersinia pestis. It was discovered that people who had two copies of the "good" ERAP2 gene were able to make functional proteins, which are molecules that aid the immune system in recognising an infection.

These ERAP2 copies, according to researchers from McMaster University, the University of Chicago, the Pasteur Institute, and other institutions, "enabled more efficient neutralisation of Y pestis by immune cells."

Comparing individuals who had the mutation to those who did not, those who had it would have had a 40% higher chance of surviving the Black Death.

The study's co-senior author and anthropology professor at McMaster University in Canada, Hendrik Poinar, stated the investigation was the first study of how pandemics could modify genomes but go undetected in modern populations.

What gave excellent protection during hundreds of years of plague epidemics has now been revealed to be autoimmune-related, he continued, because these genes are underbalancing selection.

"A hyperactive immune system may have been beneficial in the past, but it may not be as beneficial in today's environment."

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