Ancient Skeleton Rewrites History: 5,500-Year-Old Syphilis-Like Pathogen Found
Scientists have made a stunning discovery. They found a 5,500-year-old skeleton in Colombia. This skeleton holds the oldest known genome of a syphilis-like bacterium. Therefore, it rewrites the history of infectious diseases in the Americas.
What Are Treponemal Diseases?
Today, Treponema pallidum bacteria cause diseases like syphilis. However, they also cause yaws and bejel. These diseases are ancient, but their origins are unclear. For example, we do not know when each form emerged. Genetic evidence helps solve this puzzle.
An Unexpected Ancient Strain
Researchers reconstructed the bacterium’s genome. Interestingly, it does not match any modern strains. This ancient form split from known lineages long ago. As a result, it represents a lost branch of the pathogen’s family tree. The strain may relate to pinta, a skin disease. “It is a lead worth investigating further,” said researcher Anna-Sapfo Malaspinas. Genetic dating suggests it diverged roughly 13,700 years ago. In contrast, modern forms diversified about 6,000 years ago. This find pushes back the disease’s history by millennia. It shows treponemal diseases were diversifying long before European contact. The research also used an unusual method. Scientists extracted DNA from a shin bone with no visible signs of infection. Therefore, even healthy-looking bones can hide pathogen secrets. Understanding ancient disease evolution is crucial. It helps us anticipate future health threats. The team also prioritized ethical communication. They shared findings with local Colombian communities first. This step ensures respectful stewardship of the discovery.
A Collaborative Scientific Effort
The discovery was an international effort. Teams from the U.S., Switzerland, and beyond collaborated. Initially, they sequenced the skeleton for population studies. However, they stumbled upon the pathogen DNA. Deep sequencing allowed them to reconstruct its genome without specialized techniques. In summary, this ancient genome reveals a hidden chapter in medical history. It proves that syphilis-like illnesses have challenged humans for thousands of years.
