World's oldest family tree reconstructed from Stone Age tomb

The study reveals how prehistoric families were structured.

(CNN)The oldest family tree in the world has been reconstructed through the analysis of ancient DNA taken from a Stone Age tomb in Britain, according to a new study published Wednesday.

Researchers extracted DNA from the bones and teeth of 35 individuals buried at Hazleton North long cairn in the Cotswolds-Severn region, England. They found that 27 of them were close biological relatives and were from five continuous generations of a single extended family.
The group lived around 3700-3600 BC -- approximately 5,700 years ago. Researchers discovered that most of those buried in the tomb were descended from four women who had children with the same man.
    Archaeologists and geneticists from institutions around the world -- including Newcastle University, in England, the University of the Basque Country, in Spain, the University of Vienna, in Austria, and Harvard University, US -- were involved in the research.
      DNA was extracted from the bones and teeth of 35 individuals buried at Hazleton North long cairn, in England.
      The study, published in the journal Nature, is significant for revealing in great detail how prehistoric families were structured, researchers said.
      The findings provide fascinating new insights into kinship and burial practices during Neolithic times -- the latest period of the Stone Age.
      Iñigo Olalde of the University of the Basque Country and Ikerbasque, the lead geneticist and co-author of the study, said in a statement: "The excellent DNA preservation at the tomb and the use of the latest technologies in ancient DNA recovery and analysis allowed us to uncover the oldest family tree ever reconstructed and analyse it to understand something profound about the social structure of these ancient groups."
        Two L-shaped chambered areas were discovered by researchers at Hazleton North.
        Researchers found that people were buried in the two L-shaped chambered areas at Hazleton North. The chambers were located on north and south of the center or "spine"of the structure.
        Men were generally buried with their father and brothers, suggesting that descent was patrilineal, as the later generations buried at the tomb were connected to the earlier generations buried there entirely through male relatives.
        Two of the daughters in the family tree who died in childhood were also buried in the tomb but the team found a total absence of adult daughters, suggesting that their remains were either placed in the tombs of male partners they would have had children with or buried elsewhere entirely.