The Black Death impacted human genetics so significantly that the Middle Age pandemic still affects our health more than 700 years later.
An international team of researchers examined DNA from victims and survivors of the bubonic plague - also known simply as 'the plague' - that occurred in the 14th century, wiping out around 50% of the European population.Genes that offered protection against the bubonic plague are associated with an increased susceptibility to autoimmune diseases such as Crohn's and rheumatoid arthritis today, according to DNA analysis.They found that individuals who had what the scientists describe as a "good" variant of a particular gene, known as ERAP2, survived the pandemic at much higher rates than those who did not.The researchers said their findings, published in the journal Nature, shed light on how the Black Death shaped the evolution of immunity genes such as ERAP2, setting the course for how humans respond to disease today.Luis Barreiro, professor of genetic medicine at the University of Chicago Medical Center in the US and co-senior author on the study, said: "This is, to my knowledge, the first demonstration that indeed, the Black Death was an important selective pressure to the evolution of the human immune system."One of the worst plagues in history, the Black Death arrived on the shores of Europe in 1347.Five years later, around 25 to 50 million people were dead across the continent.The first outbreak of plague swept across England in 1348, ravaging London and East Anglia before spreading to Wales and the Midlands.For the study, the scientists extracted more than 500 ancient DNA samples from the remains of individuals, including those buried in London – in the East Smithfield plague
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