Ancient DNA finds a lost yak relative in Siberian bones
ancient genome
The complete inherited information preserved from an old organism.
bovine
A member of the cattle family.
Denisova Cave
A cave in southern Siberia where ancient remains were found.
What happened
Researchers studying fragmentary bones from southern Siberia found a lost bovine lineage. The animals were related to modern yaks, but they followed a separate evolutionary path and later disappeared. Many remains came from Denisova Cave and nearby sites. The team used ancient DNA from the fragments and generated 20 ancient genomes spanning 200,000 years. The findings were reported by Phys.org, and the study appears in Current Biology.
Why the bones were hard to identify
The bones did not have enough visible features for normal identification. Researchers therefore used genetic evidence. They compared the ancient genomes with genomes from modern yaks and other bovines. A genome is an organism’s full set of inherited information. The comparison showed that the fragments belonged to a previously unknown branch related to yaks.
This approach matters because a bone can be scientifically important without looking distinctive. DNA can connect separate fragments to the same family line. It can also reveal relationships that bones alone cannot show clearly.
What the DNA confirmed
The lost lineage began diverging from modern yaks about 400,000 years ago. It had become fully separate about 250,000 years ago. These dates are estimates based on genetic comparisons. The researchers found little evidence that this lineage interbred with steppe bison or aurochs. Aurochs were extinct wild ancestors of domestic cattle.
The ancient animals lived across southern Siberia and the wider Altai–Sayan region. Modern wild yaks are now restricted to higher elevations of the Tibetan Plateau. The two groups were related, but they were not the same species.
Why it matters
The discovery shows how ancient DNA can recover a large animal’s history from bones that were impossible to identify by shape. It also gives researchers a long record of population change. The 20 genomes cover about 200,000 years, allowing comparisons across several cold and warm cycles.
The results suggest that a population replacement happened during a warm period about 120,000 years ago. Genetic diversity also declined then. The researchers say this may reflect the effects of warming on an animal adapted to cold conditions. The Altai–Sayan region may have been an important refuge and biodiversity center during repeated ice ages.
What remains unknown
The animal’s exact extinction date is not known. The youngest specimen studied was about 27,000 years old, but the species disappeared sometime after that. Researchers also do not know why it vanished. Climate change may have mattered, but the study does not establish one final cause.
The lineage also does not yet have a formal species name. Genetic evidence alone is not enough for formal classification. The researchers must compare the DNA results with previously described yak-like remains.
What comes next
The next step is to match the genetic lineage with physical bones. That work may show which fossils belong to the lost animal. It may also clarify how widely it lived and when its population ended. For now, the main lesson is clear: even an unremarkable bone fragment can preserve a missing branch of the animal family tree.
Ancient DNA reveals a lost yak relative
📰 Full story: Ancient DNA finds a lost yak relative in Siberian bones
Scientists used old genetic information to identify mysterious Siberian bones.
ancient DNA
Genetic information preserved from an organism that lived long ago.
yak
A cattle relative that lives in high mountain regions.
Denisova Cave
An ancient cave in southern Siberia.
💡 The gist
- Scientists found a lost relative of the yak, a mountain cattle relative.
- Ancient DNA identified bones that were hard to classify.
- The animal disappeared, but its extinction story remains incomplete.
Researchers studied bones from southern Siberia. Many came from Denisova Cave, an ancient cave in the region. The bones did not show enough shape for easy identification. Scientists then studied their ancient DNA. Ancient DNA is genetic information preserved from long-dead organisms.
The DNA showed a close relationship with modern yaks. However, the ancient animal was not the same species. Its lineage began separating from modern yaks about 400,000 years ago. It became fully separate about 250,000 years ago.
The team examined 20 ancient genomes across 200,000 years. This long record revealed changes over time. A population replacement may have happened during a warm period about 120,000 years ago. Genetic diversity also fell during that period.
Why could warming matter? Animals adapted to cold may lose suitable places when temperatures rise. Their groups may move, shrink, or be replaced. The study suggests this kind of change may have affected the lost yak relative. It does not prove warming caused the extinction.
The youngest studied specimen was about 27,000 years old. Scientists still do not know when the animal vanished. They also do not know why it vanished. The animal has no formal species name yet. DNA alone cannot complete that step. Researchers must compare the results with yak-like bones described earlier.
The discovery shows why ancient DNA matters. It can identify animals whose bones reveal very little. It can also connect fossils across long stretches of time.
Source: Phys.org and Current Biology.
Old bones revealed a lost yak relative
📰 Full story: Ancient DNA finds a lost yak relative in Siberian bones
Tiny bone pieces held a big animal mystery.
DNA
Information inside living things.
yak
A cattle relative that lives in mountains.
Denisova Cave
An old cave in Siberia.
A long time ago, a cattle relative lived in Siberia.
People found its old bones in Denisova Cave, an old cave in Siberia.
The bones did not show the animal’s name. They were too hard to identify by shape.
Scientists checked the bones’ DNA. DNA is information inside living things.
The DNA matched a yak relative. A yak is a mountain cattle relative.
This animal was different from today’s yak. It followed its own family line.
Warm weather may have changed its living place. Its group may have been replaced.
We do not know when it disappeared. We do not know why it disappeared.
The animal’s official species name is not ready. Scientists need to compare more bones.
Source: Phys.org