DNA from 5,700-year-old gum shows what one ancient woman may have looked like – Science News

Fossilized bones and teeth arentthe only source of ancient human DNA.

The genetic material also sticks around in birch pitch chewing gum, which can hold enough DNA to piece together the genetic instruction books, or genomes, of long-dead people, researchers report December 17 in Nature Communications. By analyzing a 5,700-year-old chewed wad of pitch from Denmark, the team obtained the genome of an ancient woman, and determined that she probably had blue eyes, dark skin and dark hair.

Ancient humans likely chewed the pitch made by heating birch bark to make it pliable, working cells from the mouth deep into the sticky substance. Birch pitch is relatively resistant to bacteria and viruses as well as water, which would have protected the DNA from decay, the researchers say.

The team also recovered DNA frommicrobes that may have lived in the womans mouth, including from olderversions of Epstein-Barr virus, which causes mononucleosis, and bacteria that cancause pneumonia or gum disease. Duck and hazelnut DNA were also identified, andmay be remnants from a recent meal the woman ate before popping a piece ofpitch into her mouth.

Scientists have gleanedinformation about ancient humans mouth microbes and diets (SN: 10/4/17)from dental plaque in fossilized teeth (SN: 3/8/17).But thats been built up over many years, says study coauthor HannesSchroeder, a geneticist at the University of Copenhagen. With the chewing gum,its kind of like a snapshot of one moment in time.

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DNA from 5,700-year-old gum shows what one ancient woman may have looked like - Science News