On the Origin of Our Species: Untangling Ancestry in the Evolution of Homo sapiens

Jebel Irhoud Cranium

This cranium from Jebel Irhoud in Morocco is often called a modern human ancestor. The meaning of that ancestry is discussed and disentangled in a new study by Bergstrom and colleagues. Credit: Chris Stringer

Experts from the Natural History Museum, The Francis Crick Institute, and the Max Planck Institute for the Science of Human History Jena have joined together to untangle the different meanings of ancestry in the evolution of our species Homo sapiens.

Most of us are fascinated by our ancestry, and by extension the ancestry of the human species. We regularly see headlines like ‘New human ancestor discovered’ or ‘New fossil changes everything we thought about our ancestry’, and yet the meanings of words like ancestor and ancestry are rarely discussed in detail. In the new paper, published in Nature, experts review our current understanding of how modern human ancestry around the globe can be traced into the distant past, and which ancestors it passes through during our journey back in time.

Co-author researcher at the Natural History Museum Prof Chris Stringer said: “Some of our ancestors will have lived in groups or populations that can be identified in the fossil record, whereas very little will be known about others. Over the next decade, growing recognition of our complex origins should expand the geographic focus of paleoanthropological fieldwork to regions previously considered peripheral to our evolution, such as Central and West Africa, the Indian subcontinent, and Southeast Asia.”

The study identified three key phases in our ancestry that are surrounded by major questions, and which will be frontiers in coming research. From the worldwide expansion of modern humans about 40-60 thousand years ago and the last known contacts with archaic groups such as the Neanderthals and Denisovans, to an African origin of modern human diversity about 60-300,000 years ago, and finally the complex separation of modern human ancestors from archaic human groups about 300,000 to 1 million years ago.

The scientists argue that no specific point in time can currently be identified when modern human ancestry was confined to a limited birthplace, and that the known patterns of the first appearance of anatomical or behavioral traits that are often used to define Homo sapiens fit a range of evolutionary histories.

Co-author Pontus Skoglund from The Francis Crick Institute said: “Contrary to what many believe, neither the genetic or fossil record have so far revealed a defined time and place for the origin of our species. Such a point in time, when the majority of our ancestry was found in a small geographic region and the traits we associate with our species appeared, may not have existed. For now, it would be useful to move away from the idea of a single time and place of origin.”

“Following from this, major emerging questions concern which mechanisms drove and sustained this human patchwork, with all its diverse ancestral threads, over time and space,” said co-author Eleanor Scerri from the Pan-African Evolution Research Group at the Max Planck Institute for the Science of Human History. “Understanding the relationship between fractured habitats and shifting human niches will undoubtedly play a key role in unraveling these questions, clarifying which demographic patterns provide a best fit with the genetic and palaeoanthropological record.”

The success of direct genetic analyses so far highlights the importance of a wider, ancient genetic record. This will require continued technological improvements in ancient DNA (aDNA) retrieval, biomolecular screening of fragmentary fossils to find unrecognized human material, wider searches for sedimentary aDNA, and improvements in the evolutionary information provided by ancient proteins. Interdisciplinary analysis of the growing genetic, fossil, and archaeological records will undoubtedly reveal many new surprises about the roots of modern human ancestry.

Reference: “Origins of modern human ancestry” by Anders Bergström, Chris Stringer, Mateja Hajdinjak, Eleanor M. L. Scerri and Pontus Skoglund, 10 February 2021, Nature.
DOI: 10.1038/s41586-021-03244-5

4 Comments on "On the Origin of Our Species: Untangling Ancestry in the Evolution of Homo sapiens"

  1. Have you considered that your macro evolutionary assumptions may be incorrect?

    Dr John Sanford (Geneticist and inventor of the Gene Gun) who is an EX-evolutionist said :
    “The bottom line
    is that the primary axiom [of Darwinian/Macro evolution]
    is categorically false,
    you can’t create information with misspellings,
    not even if you use natural selection.”
    “I had been trained in evolution and everything I had ever thought was in terms of evolution.
    For me, it was a– as clear as the world around us. It was just uncontestable.
    But in retrospect, I had not critically assessed much of what I believed.
    I believed it based upon very little, without critical assessment.”

  2. … how quantum leaps in evolution happened?
    How come, the virus genes are present in a animal genes after all. Did mammals evolved just because some virus gave a great advantage to that early animal, and you have some advantage other species don’t…

  3. Theot58,
    First off intelligent design can not be tested in the lab so it has no place in scientific discussion.
    2nd if true, it merely means we’re observing the rules the Creator put in place to govern life. Evolution would therefore be how it was intelligently designed.
    3rd. Dr Stanford is a moron and his logic is completely flawed. It’s called NATURAL SELECTION not mutation selection. Look at the any animal we’ve selected for breeding. Lop eared rabbits didnt come about by random mutations they were selected and bred to have long ears. In addition his understanding of mutation is just flat wrong and he offers no competing mechanism for how the intelligent design would work. Anyone who thinks God and evolution are incompatible are morons. Dr. Stanford think the earth is 100,000 years old. Who could possibly take him seriously he’s a nutcase.

  4. I am the only one who predicted existence H. S. in Morocco 300,000 years ago. Intelligence is in a core oh human evolution. Here is my FEST theory

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