FRANCAIS

L'histoire en tant que science et champ d'études est en pleine mutation.
Grâce aux apports constants de l'archéologie, de la génétique, ainsi qu'à la confrontation avec d'autres sciences humaines (anthropologie, sciences sociales) ou "sciences dures" (démographie, biologie, statistiques) ce que l'on pensait acquis sur l'histoire et la généalogie des peuples est constamment enrichi et remis en question.
Ce blog a pour objet d'informer sur certaines découvertes qui modifient (ou pourraient modifier) nos connaissances sur nos ancêtres, des premiers homo sapiens jusqu'à nos grands-pères...


ENGLISH

History as a science and a field of study is undergoing significant changes.
Thanks to the contribution of archaeology, genetics, as well as exchanges with other human sciences (anthropology, social sciences) or "hard sciences" (demography, biology, statistics), historical and genealogical facts that were once considered to be established or "written in stone" are now being questioned, revised and enriched.
The aim of this blog is to inform and discuss current discoveries that modify (or could modify) what we know about our ancestors, from the first homo sapiens to our grandfathers...



mardi 22 août 2017

Genetic continuity between Ancient and Modern Greeks

The Greeks really do have near-mythical origins, ancient DNA reveals

article published on the website sciencemag.org
 
Ever since the days of Homer, Greeks have long idealized their Mycenaean “ancestors” in epic poems and classic tragedies that glorify the exploits of Odysseus, King Agamemnon, and other heroes who went in and out of favor with the Greek gods. Although these Mycenaeans were fictitious, scholars have debated whether today’s Greeks descend from the actual Mycenaeans, who created a famous civilization that dominated mainland Greece and the Aegean Sea from about 1600 B.C.E. to 1200 B.C.E., or whether the ancient Mycenaeans simply vanished from the region.
Now, ancient DNA suggests that living Greeks are indeed the descendants of Mycenaeans, with only a small proportion of DNA from later migrations to Greece. And the Mycenaeans themselves were closely related to the earlier Minoans, the study reveals, another great civilization that flourished on the island of Crete from 2600 B.C.E. to 1400 B.C.E. (named for the mythical King Minos).
The Lion Gate was the main entrance to the Bronze Age citadel of Mycenae, the center of the Mycenaean civilization. 
RnDmS/iStockphoto

The ancient DNA comes from the teeth of 19 people, including 10 Minoans from Crete dating to 2900 B.C.E. to 1700 BCE, four Mycenaeans from the archaeological site at Mycenae and other cemeteries on the Greek mainland dating from 1700 B.C.E. to 1200 B.C.E., and five people from other early farming or Bronze Age (5400 B.C.E. to 1340 B.C.E.) cultures in Greece and Turkey. By comparing 1.2 million letters of genetic code across these genomes to those of 334 other ancient people from around the world and 30 modern Greeks, the researchers were able to plot how the individuals were related to each other.
The Mycenaeans did have an important difference: They had some DNA—4% to 16%—from northern ancestors who came from Eastern Europe or Siberia. This suggests that a second wave of people from the Eurasian steppe came to mainland Greece by way of Eastern Europe or Armenia, but didn’t reach Crete, says Iosif Lazaridis, a population geneticist at Harvard University who co-led the study.
This dancing Minoan woman from a fresco at Knossos, Crete (1600–1450 B.C.E.), resembles the Mycenaean women (above).
Wolfgang Sauber/Wikimedia Commons

Not surprisingly, the Minoans and Mycenaeans looked alike, both carrying genes for brown hair and brown eyes. Artists in both cultures painted dark-haired, dark-eyed people on frescoes and pottery who resemble each other, although the two cultures spoke and wrote different languages. The Mycenaeans were more militaristic, with art replete with spears and images of war, whereas Minoan art showed few signs of warfare, Lazaridis says. Because the Minoans script used hieroglyphics, some archaeologists thought they were partly Egyptian, which turns out to be false.
When the researchers compared the DNA of modern Greeks to that of ancient Mycenaeans, they found a lot of genetic overlap. Modern Greeks share similar proportions of DNA from the same ancestral sources as Mycenaeans, although they have inherited a little less DNA from ancient Anatolian farmers and a bit more DNA from later migrations to Greece.
The continuity between the Mycenaeans and living people is “particularly striking given that the Aegean has been a crossroads of civilizations for thousands of years,” says co-author George Stamatoyannopoulos of the University of Washington in Seattle. This suggests that the major components of the Greeks’ ancestry were already in place in the Bronze Age, after the migration of the earliest farmers from Anatolia set the template for the genetic makeup of Greeks and, in fact, most Europeans. “The spread of farming populations was the decisive moment when the major elements of the Greek population were already provided,” says archaeologist Colin Renfrew of the University of Cambridge in the United Kingdom, who was not involved in the work.
The results also show it is possible to get ancient DNA from the hot, dry landscape of the eastern Mediterranean, Renfrew says. He and others now have hope for getting DNA from groups such as the mysterious Hittites who came to ancient Anatolia sometime before 2000 B.C.E. and who may have been the source of Caucasian ancestry in Mycenaeans and early Indo-European languages in the region. Archaeologist Kristian Kristiansen of the University of Gothenburg in Sweden, who was not involved in the work, agrees. “The results have now opened up the next chapter in the genetic history of western Eurasia—that of the Bronze Age Mediterranean.”