Japan scientists injected 40,000 -year -old Neanderthalian DNA in mice, causing unexpected changes in their skeleton. The results offer new surprising perspectives on the ancient human species.
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In a new amazing study, geneticists in Japan revealed how injecting a 40,000-year-old Neanderthal gene in mice has led to deep changes in their skeleton structure. This experiment, carried out with the help of the most modern gene editing technology, has revealed physical features reminiscent of long missing human ancestors, giving a look at the evolution of our species, writes Daily Galaxy.
Scientists revive Neanderthal traits to mice
In a laboratory at the University of Medicine in Kyoto Prefecture, a team led by Dr. Ako Agata and Dr. Tadashi Nomura used CRISPR technology to introduce a single genetic variant to laboratory mice. It is known that the gene, GLI3, is present in Neanderthalians and Denisovani, archaic human relatives who lived decades ago. The experiment, published in the Biorxiv magazine, aimed to understand how ancient genetic variants contributed to the skeletal differences between the early and homo sapiens.
The specific variant injected into mice was R1537C – a mutation found in the GLI3 gene that influences the development of bones and organs during embryonic growth. Scientists have hoped to see how this mutation could reflect the characteristics of the skeleton observed in neanderthale fossils, such as wide chest, elongated skulls and prominent ridges.
Mice show unprecedented skeletal changes
The results were immediate and striking. Genetically modified mice began to develop physical characteristics reminiscent of the anatomy of Neanderthal. Some of the mice had wider skulls, while others had signs of curvature of the scoliosis and anomalies of the ribs. These alterations have resumed skeletal features commonly associated with Neanderthal remains, such as a wider chest and a stronger rib torsion, which have been observed in fossil recordings.
This experiment is one of the clearest demonstrations so far of how certain ancient genes can influence the morphology of the skeleton, leaving the biological differences that have separated the early human species from modern people. The modified mice had these features without suffering from serious development problems usually associated with genetic mutations, which suggests that the R1537C variant had a more subtle influence on the development of mice.
Neanderthalian genes still persist in modern people
Remarkably, the R1537C mutation is not limited to ancient history. It still exists in small parts of the modern human population, especially among non-African groups. According to data in the 1000 Genomes project, the variant is present at 3.7% to 7.7% of European populations, with lower frequencies in African populations.
This discovery implies that certain traits of Neanderthal man could model human biology today, even though they have disappeared over 40,000 years ago. The study highlights how the genetic remains of these ancient hominins continue to persist in modern genome and can influence features such as bone development or even susceptibility to certain conditions.
Examining the impact of ancient genetic variants
Researchers also explore how this ancient genetic variant interacts with the broader genetic background of modern people. The study indicates that Neanderthal people could have experienced more relaxed constraints in their development processes, allowing mutations like R1537C to persist and even contribute to distinctive skeletal characteristics. This finding could explain why some Neanderthalia traits are still visible in current human populations.
While modified mice did not have more serious deformations commonly associated with GLI3 mutations – such as polydactilia or abnormal development of the limbs – researchers have observed subtle but significant changes in how the gene regulated development processes. This suggests that the ancient variants of hominis, although contributing to species specific features, could have been crucial in modeling both missing and living human bodies.
