Scientists Say The Genetic Turnover Remains A Mystery
MessageToEagle.com - Did ancient aliens temper with human DNA in the past?
Something very strange and unexplained happened with Europeans DNA 4,000-5,000 years ago. For reasons totally unknown, the genetic markers of this first pan-European culture, were suddenly replaced around 4500 years ago. Scientists don't know why.
Ancient DNA recovered from a series of skeletons in central Germany up to 7500 years old has been used to reconstruct the first detailed genetic history of modern Europe.
A study conducted by an international team of researchers at the University of Adelaide's Australian Centre for Ancient DNA (ACAD), and their colleagues from the University of Mainz, Germany and the National Geographic Society's Genographic Project, reveals a dramatic series of events including major migrations from both Western Europe and Eurasia, and signs of an unexplained genetic turnover about 4000-5000 years ago.
The research was performed at the University of Adelaide's Australian Centre for Ancient DNA (ACAD). Researchers used DNA extracted from bone and teeth samples from prehistoric human skeletons to sequence a group of maternal genetic lineages that are now carried by up to 45% of Europeans.
"This is the first high-resolution genetic record of these lineages through time, and it is fascinating that we can directly observe both human DNA evolving in 'real-time', and the dramatic population changes that have taken place in Europe," says joint lead author Dr Wolfgang Haak of ACAD.
"We can follow over 4000 years of prehistory, from the earliest farmers through the early Bronze Age to modern times."
"The record of this maternally inherited genetic group, called Haplogroup H, shows that the first farmers in Central Europe resulted from a wholesale cultural and genetic input via migration, beginning in Turkey and the Near East where farming originated and arriving in Germany around 7500 years ago," says joint lead author Dr Paul Brotherton, formerly at ACAD and now at the University of Huddersfield, UK.
"We have established that the genetic foundations for modern Europe were only established in the Mid-Neolithic, after this major genetic transition around 4000 years ago," says Dr Haak.
"This genetic diversity was then modified further by a series of incoming and expanding cultures from Iberia and Eastern Europe through the Late Neolithic."
"The expansion of the Bell Beaker culture (named after their pots) appears to have been a key event, emerging in Iberia around 2800 BC and arriving in Germany several centuries later," says Dr Brotherton.
"This is a very interesting group as they have been linked to the expansion of Celtic languages along the Atlantic coast and into central Europe."
"We can not only estimate population sizes but also accurately determine the evolutionary rate of the sequences, providing a far more accurate timescale of significant events in recent human evolution."
There are still many things we do not know about our origins. Just recently scientists discovered for example a new mysterious human species that co-existed with our ancestors as recently as 11,000 - 14,000 years ago.
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