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Ancient DNA (aDNA) analysis — extracting and sequencing genetic material from archaeological specimens (bones, teeth, hair) — has produced the most dramatic revision of prehistoric human history in decades. Since the first ancient human genome was sequenced in 2010 (40,000-year-old Denisovan finger bone), the field has revealed migrations, admixtures, and population replacements that traditional archaeology completely missed.
Major revelations: Denisovans (an entire unknown human lineage revealed only from a few bone fragments and DNA — they interbred with Homo sapiens, and Melanesians carry 4-6% Denisovan DNA); European population replacement (ancient DNA shows that present-day European populations are a mixture of at least 3 source populations: Mesolithic hunter-gatherers, early Neolithic farmers from Anatolia, and Bronze Age steppe people from the Russian-Ukrainian steppe — the Yamnaya expansion ~5,000 years ago replaced much of Europe's previous population); the origins of Indo-European languages (steppe expansion, explaining why languages from Ireland to India share deep structural similarities); and the Plague (Yersinia pestis ancient DNA in Bronze Age skeletons). David Reich's lab at Harvard has been the most productive source.
# Top 10 ancient DNA facts
- 1Denisovan discovery (finger bone only)
- 2European population replacement (3 source populations)
- 3Yamnaya steppe expansion (Indo-European languages)
- 4Ötzi the Iceman (5,300 years, complete genome)
- 5Plague origin (Yersinia pestis in Bronze Age)
- 6Native American founding population
- 7horse domestication DNA
- 8Egyptian mummies (DNA 2017)
- 9Neanderthal genome (Svante Pääbo, Nobel 2022)
- 10oldest DNA (700,000-year-old horse bone)
Fascinating Facts
- ◆Svante Pääbo received the Nobel Prize in Physiology or Medicine in 2022 for sequencing the Neanderthal genome — achieving what was considered impossible because ancient DNA is heavily fragmented and contaminated with bacterial DNA — and discovered that all non-African humans carry 1-4% Neanderthal DNA from interbreeding 40,000-60,000 years ago
- ◆The Yamnaya steppe people (from modern Russia/Ukraine) expanded across Europe approximately 5,000 years ago in what ancient DNA studies reveal was one of the most dramatic population replacements in prehistory — within a few centuries, Yamnaya ancestry replaced 40-75% of the genetic heritage of European populations who had been there for millennia
- ◆Ancient DNA from Bronze Age skeletons in Kazakhstan (3,500-4,000 years old) has shown that Yersinia pestis (bubonic plague) was already infecting humans 2,000 years before the Black Death — the bacteria was evolving from a relatively mild disease into the flea-transmitted pandemic strain, with sequential genetic changes documented across ancient skeletons across 500 years
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