Summary
Highlights
Forty thousand years ago, Neanderthals inhabited Europe. The arrival of modern humans marked the beginning of their end, prompting questions about their interaction and disappearance. Researchers are intrigued by why Neanderthals, who survived for 300,000 years, vanished and the extent of their genetic influence on us.
An international team, led by geneticist Svante Pääbo at the Max Planck Institute in Leipzig, successfully decoded the genome of an extinct human for the first time. This monumental task involved developing new methods and technologies, with Johannes Krause playing a key role, aiming to discover if any Neanderthal traits persist in modern humans.
The first Neanderthal bones were found in 1856 in a quarry near Düsseldorf, Germany, in a valley later named Neandertal. Initially, the scientific community, particularly Rudolf Virchow, dismissed them as deformed modern human bones, contributing to the enduring stereotype of Neanderthals as primitive and unintelligent beings.
A significant find in Krapina, Croatia, in 1899, uncovered numerous Neanderthal bones. Traces on these bones led some researchers to suspect cannibalism, further cementing the negative image of Neanderthals. However, other researchers identified mysterious notches on a skull, hinting at possible symbolic behavior, which challenged the cannibalistic interpretation.
Modern understanding portrays Neanderthals as highly intelligent Ice Age hunters, who used fire, wore clothes, could speak, and were physically superior to modern humans in terms of strength and speed. They were social beings, mirroring aspects of modern humanity, and possessed refined crafting skills for tools and weapons.
Neanderthals were super predators with a heavy reliance on meat, driving them to hunt continuously. They engaged in close combat with dangerous animals like mammoths and rhinos. Their high-risk lifestyle led to frequent injuries and a high mortality rate, with few surviving past their 40s. Their dependence on meat made them vulnerable to changes in game availability or climate.
Researchers at the Max Planck Institute used 3D scanning of an eight-year-old Neanderthal child's jawbone to create a virtual model. This revealed that Neanderthals developed faster than modern humans, having a shorter childhood and less time for learning. Compared to modern humans, Neanderthals had larger heads, prominent brow ridges, and a different internal brain organization.
Ralf Schmitz embarked on re-excavating the original Neandertal site 150 years after the initial discovery, hoping to find more remains. Despite the challenging conditions of the transformed valley, his team successfully uncovered additional Neanderthal bones, including a cheekbone and fragments that fit the original skeleton, confirming the site's authenticity.
Svante Pääbo's team, initially working with animal DNA, eventually obtained support from Ralf Schmitz to analyze a Neanderthal arm bone. This bone revealed that the individual had a disabled arm, suggesting that Neanderthals cared for their injured or sick, indicating complex social structures. This finding painted a picture of Neanderthals as caring, not just brave, individuals.
Human contamination of Neanderthal bones posed a significant challenge for DNA sequencing. The team searched across Europe for uncontaminated specimens, finding a 'golden bone' in Croatia's Vindija cave. This site, one of Europe's most important Neanderthal locations, contained young Neanderthal remains from a critical period of interaction with early modern humans.
Speculation exists about interbreeding between Neanderthals and modern humans, particularly around sites like Vindija. However, genetic research indicates that the intermixing, which resulted in a small amount of Neanderthal DNA in modern Europeans and Asians (but not Africans), likely occurred in the Middle East, prior to the dispersal of modern humans across the globe.
To understand Neanderthal traits like speech, scientists compared their genes with those of chimpanzees and modern humans. Geneticist Wolfgang Enard's research on a language gene, found in both humans and Neanderthals, suggests that Neanderthals likely possessed the capacity for language, challenging previous assumptions.
After 13 years, the Neanderthal genome was fully decoded using advanced technology. This revealed substantial genetic intermixing, meaning a small percentage of Neanderthal DNA exists in modern non-African populations. This discovery revolutionized our understanding, confirming that Neanderthals are indeed part of our family tree, influencing traits of modern humans.
Despite similarities like decorating with colors, Neanderthals mysteriously lacked artistic expression, a key difference from modern humans. Modern humans' success is attributed to better communication, flexibility, and adaptability, contrasting with the Neanderthals' fixed ways. The coincidence of their extinction with the arrival of modern humans suggests human influence as a primary factor, rather than natural causes.
Modern humans replaced Neanderthals in their hunting grounds, leading to their diminishing numbers and eventual extinction about 28,000 years ago. Their culture and craftsmanship were lost. However, the ongoing study of the Neanderthal genome continues to reveal fascinating insights into our extinct relatives, confirming that a part of them lives on in each of us.