Parathropus robustus
© Roman Yevseyev.
New clues from 2 million-year-old tooth enamel tell us more about an ancient relative of humans
Where exactly the archaic hominin,
Paranthropus robustus fits into the human evolutionary tree remains a subject of debate among palaeontologists. This species lived in southern Africa around 2 million years ago. They walked upright, indicating a shared ancestry with the
Australopithecus and the later
Homo genus. However, their comparatively small brains and massive jaws and teeth suggest a distinct evolutionary path, likely adapted for processing tough, fibrous plant material.
Determining their precise place in our evolutionary history would ideally require DNA analysis—but DNA does not survive long in the warm African climate. To overcome this limitation, a team of African and European researchers from the fields of molecular science, chemistry, and palaeoanthropology turned to a cutting-edge technique known as palaeoproteomics. By analysing proteins recovered from ancient tooth enamel, they were able to infer aspects of the underlying DNA, since the amino acid sequence in proteins is directly determined by the nucleotide sequence in DNA.
Their findings suggest that the story of early hominins is more complex than previously thought. There may have been more than one closely related species, with evidence of interbreeding or genetic divergence followed by remixing — patterns that would later come to characterise the tangled branches of the hominin family tree.
The research team included three postdoctoral scientists from the University of Copenhagen — Palesa P. Madupe, Claire Koenig, and Ioannis Patramanis — who have
written about their work and its significance in the open-access magazine
The Conversation.
Their findings are also
published in Science.
Their article in
The Conversation is reproduced here under a Creative Commons licence, reformatted for stylistic consistency:
