{"id":18244,"date":"2024-12-12T18:02:17","date_gmt":"2024-12-12T19:02:17","guid":{"rendered":"https:\/\/medexperts.pro\/?p=18244"},"modified":"2024-12-12T19:29:06","modified_gmt":"2024-12-12T19:29:06","slug":"oldest-human-genomes-reveal-how-a-small-group-burst-out-of-africa","status":"publish","type":"post","link":"https:\/\/medexperts.pro\/?p=18244","title":{"rendered":"Oldest Human Genomes Reveal How a Small Group Burst Out of Africa"},"content":{"rendered":"

DNA from European fossils dating back 45,000 years offers new clues to how our species spread across the world.<\/p>\n

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Some 45,000 years ago, a tiny group of people \u2014 fewer than 1,000, all told \u2014 wandered the icy northern fringes of Europe. Across thousands of miles of tundra, they hunted woolly rhinoceros and other big game. Their skin was most likely dark. To keep warm in the bone-chilling temperatures, they probably wore the hides and furs of the animals they killed.<\/p>\n

These hardy people of the Ice Age, known as the LRJ culture, left behind distinctive stone tools and their own remains in caves scattered across Europe. On Thursday, researchers revealed<\/a> the genomes of seven LRJ individuals from fossilized bones found in Germany and the Czech Republic \u2014 the oldest genetic specimens of modern humans yet found.<\/p>\n

It turns out the LRJ people were part of the early human expansion from Africa to other parts of the world. But theirs was a surprisingly recent migration.<\/p>\n

The common ancestors of the LRJ people and today\u2019s non-Africans lived about 47,000 years ago. In contrast, studies of remains in Australia suggest that modern humans reached that continent 65,000 years ago<\/a>. And in China<\/a>, researchers have found what look like the bones of modern humans dating back 100,000 years.<\/p>\n

The huge gap between those ages could change our understanding about how humans spread across the world. If the ancestors of today\u2019s non-Africans didn\u2019t sweep across other continents until 47,000 years ago, then those older sites must have been occupied by earlier waves of humans who died off without passing down their DNA to the people now living in places like China and Australia.<\/p>\n

\u201cThey cannot be part of the genetic diversity that\u2019s present outside Africa,\u201d said Johannes Krause, a geneticist at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, and an author of the new study.<\/p>\n<\/div>\n<\/div>\n

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Ancient Bones From Modern Humans<\/h2>\n

Bones found in caves in Germany and the Czech Republic were from the LRJ people, modern humans with long stretches of Neanderthal DNA.<\/p>\n<\/header>\n

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<\/div>\n
\n

45,000 years ago<\/p>\n

The LRJ people, a group of modern humans with stretches of Neanderthal DNA, reach northern Europe.<\/p>\n<\/p><\/div>\n

\n

Caves<\/p>\n<\/p><\/div>\n

\n

EUROPE<\/p>\n<\/p><\/div>\n

\n

Earlier waves of modern<\/span><\/p>\n

humans may have reached<\/p>\n

China 100,000 years ago …<\/p>\n<\/p><\/div>\n

\n

ASIA<\/p>\n<\/p><\/div>\n

\n

47,000 years ago<\/p>\n

After leaving Africa, the group interbreeds with Neanderthals, possibly in the Middle East.<\/p>\n<\/p><\/div>\n

\n

60,000 years ago<\/p>\n

A group of modern humans<\/p>\n

splits from other modern <\/p>\n

humans in Africa. They later <\/p>\n

migrate off the continent.<\/p>\n<\/p><\/div>\n

\n

… and Australia<\/p>\n

65,000 years ago<\/p>\n<\/p><\/div>\n

\n

AFRICA<\/p>\n<\/p><\/div>\n

\n

AUSTRALIA<\/p>\n<\/p><\/div>\n<\/p><\/div>\n

\t<\/p>\n

\n
<\/div>\n

\t\t<\/p>\n

\n

45,000 years ago<\/p>\n

The LRJ people, a group of modern<\/p>\n

humans, reach northern Europe.<\/p>\n<\/p><\/div>\n

\n

Caves<\/p>\n<\/p><\/div>\n

\n

EUROPE<\/p>\n<\/p><\/div>\n

\n

ASIA<\/p>\n<\/p><\/div>\n

\n

47,000 years ago<\/p>\n

After leaving Africa, the group interbreeds with Neanderthals, possibly in the Middle East.<\/p>\n<\/p><\/div>\n

\n

60,000 years ago<\/p>\n

A group of modern humans<\/p>\n

splits from other modern <\/p>\n

humans in Africa. They later <\/p>\n

migrate off the continent.<\/p>\n<\/p><\/div>\n

\n

AFRICA<\/p>\n<\/p><\/div>\n<\/p><\/div>\n

\t<\/p>\n

\n
<\/div>\n

\t\t<\/p>\n

\n

45,000 years ago<\/p>\n

The LRJ people, a group of modern<\/p>\n

humans, reach northern Europe.<\/p>\n<\/p><\/div>\n

\n

Caves<\/p>\n<\/p><\/div>\n

\n

EUROPE<\/p>\n<\/p><\/div>\n

\n

ASIA<\/p>\n<\/p><\/div>\n

\n

47,000 years ago<\/p>\n

After leaving Africa, the group interbreeds with Neanderthals, possibly in the Middle East.<\/p>\n<\/p><\/div>\n

\n

60,000 years ago<\/p>\n

A group of modern humans<\/p>\n

splits from other modern <\/p>\n

humans in Africa. They later <\/p>\n

migrate off the continent.<\/p>\n<\/p><\/div>\n

\n

AFRICA<\/p>\n<\/p><\/div>\n<\/p><\/div>\n

\t<\/p>\n

\n
<\/div>\n

\t\t<\/p>\n

\n

45,000 years ago<\/p>\n

The LRJ people, a group of modern<\/p>\n

humans, reach northern Europe.<\/p>\n<\/p><\/div>\n

\n

Caves<\/p>\n<\/p><\/div>\n

\n

EUROPE<\/p>\n<\/p><\/div>\n

\n

ASIA<\/p>\n<\/p><\/div>\n

\n

47,000 years ago<\/p>\n

After leaving Africa, the group interbreeds with Neanderthals, possibly in the Middle East.<\/p>\n<\/p><\/div>\n

\n

60,000 years ago<\/p>\n

A group of modern humans<\/p>\n

splits from other modern <\/p>\n

humans in Africa. They later <\/p>\n

migrate off the continent.<\/p>\n<\/p><\/div>\n

\n

AFRICA<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/div>\n

\n<\/div>\n