Did the Black Death Rewrite Human DNA?

Did the Black Death reshape human DNA? This science documentary explores how the medieval plague, ancient DNA, natural selection and the immune gene ERAP2 may be connected—and why scientists still disagree about whether the Black Death permanently altered human evolution. Between the late 1340s and early 1350s, Yersinia pestis devastated communities across Europe, North Africa and parts of Asia. Centuries later, researchers began extracting ancient human DNA from teeth and bones to investigate an extraordinary question: were some people genetically better equipped to survive the Black Death? A major 2022 study identified genetic variation near ERAP2 as a possible target of natural selection during the pandemic. ERAP2 plays an important role in how the immune system processes and presents signs of infection. Laboratory experiments also suggested that certain ERAP2 configurations may help immune cells respond more effectively to Yersinia pestis. But the conclusion remains controversial. Later researchers questioned the ancient sample sizes, archaeological dating, statistical methods and whether the proposed ERAP2 variant actually became more common after the Black Death. The result is one of the most fascinating debates in ancient DNA research. In this documentary, you will discover: • How the Black Death could have created intense natural selection • How scientists recover DNA from medieval bones and teeth • What the ERAP2 gene does inside the immune system • Why plague resistance could carry modern inflammatory trade-offs • The possible connection between ERAP2 variation and Crohn's disease • Why other geneticists challenged the original findings • How migration, genetic drift and limited samples complicate the evidence • Why plague may have shaped human immunity long before medieval Europe • Whether the Black Death truly left a detectable mark on the human genome CHAPTERS 0:00 The genetic mystery 0:34 The Black Death and ancient DNA 2:16 A pandemic as an evolutionary force 4:29 DNA from the dead 6:42 Testing the medieval hypothesis 8:46 The possible modern price 10:59 The claim comes under fire 13:32 A more complicated evolutionary legacy 15:38 The 2026 Lake Baikal discovery 17:15 Conclusion 18:45 What do you think? The plague bacterium is not literally hiding inside our DNA, and no single genetic variant can prove that someone's ancestor survived the Black Death. But devastating epidemics can influence which genetic variants are passed into future generations. The Black Death unquestionably transformed human history. Whether it transformed specific regions of the human genome as dramatically as some researchers proposed remains an open scientific question. Do you think future ancient DNA discoveries will confirm that the Black Death reshaped human immunity—or reveal a much more complicated evolutionary story? Share your view in the comments. Subscribe for more documentaries about disease, genetics, pandemics, evolution and human survival. #blackdeath #ancientdna #humanevolution