
The researchers screened DNA extracted from ancient human remains for the genomic signs of parental relatedness.
The researchers re-analyzed previously published DNA data from ancient humans that lived during the last 45,000 years to find out how closely related their parents were. The results were surprising: Ancient humans rarely chose their cousins as mates. In a global dataset of 1,785 individuals only 54, that is, about three percent, show the typical signs of their parents being cousins. Those 54 did not cluster in space or time, showing that cousin matings were sporadic events in the studied ancient populations. Notably, even for hunter-gatherers who lived more than 10,000 years ago, unions between cousins were the exception.
To analyze such a large dataset, the researchers developed a new computational tool to screen ancient DNA for parental relatedness. It detects long stretches of DNA that are identical in the two DNA copies, one inherited from the mother and one from the father. The closer the parents are related, the longer and more abundant such identical segments are. For modern DNA data, computational methods can identify these stretches with ease. However, the quality of DNA from bones that are thousands of years old is, in most cases, too low to apply these methods. Thus, the new method fills the gaps in the ancient genomes by leveraging modern high-quality DNA data. "By applying this new technique we could screen more than ten times as many ancient genomes than previously possible", says Harald Ringbauer from the Max Planck Institute for Evolutionary Anthropology, the lead researcher of the study.














Comment: A discovery in Siberia revealed a 16,000 year-old cooking pot, which is also considered to be the world's oldest, whilst Aboriginals in Australia may have been baking bread for nearly 30,000 years.
See also:
- 26,000 year old, most northerly settlement of Palaeolithic era found on Kotelny island in the Arctic, evidence of butchered mammoth bones found
- 7,200 year old evidence of cheese making found in neolithic village in Croatia may be oldest yet
- Evidence of peaceful prehistoric Japanese hunter-gatherers shows violence and warfare were uncommon
- 25 ancient tombs with encased skulls found in China's Guizhou
- Jomon woman living in Japan 3,800 years ago had high fat diet and high alcohol tolerance
- Researcher thinks China's pyramids encode astronomical alignments
And check out SOTT radio's: MindMatters: America Before: Comets, Catastrophes, Mounds and Mythology