Plate Nº 20 · recorded November 15, 2026
Biology & EvolutionReported finding
Sheep DNA map shows 10,000 years of breeding rewired gene activity
A new atlas called SheepGTEx maps gene activity across 51 sheep tissues, revealing how 10,000 years of breeding shaped gene regulation, with clues in wool and reproduction.
By Priya Raman3 min read558 words
In brief
- The study, published in Nature Genetics, analyzed 51 sheep tissues and cell types.
- Researchers used DNA from 52 ancient sheep spanning roughly 10,000 years.
- The atlas identifies hundreds of thousands of links between DNA differences and gene activity.
- A THNSL2 gene variant linked to higher skin activity grew more common in European sheep from the Neolithic to the Middle Ages.
- Strongest selection signals appeared in genetic changes affecting only one or a few tissues.
Ten thousand years of sheep breeding left measurable marks not only on the animals' DNA but on how their genes switch on and off in different parts of the body. That is the central finding of a new genetic atlas published in Nature Genetics, built by an international team that includes researchers from Aarhus University.
The resource, named SheepGTEx, maps genetic effects across 51 sheep tissues and cell types. It identifies hundreds of thousands of links between differences in DNA and the activity of genes — the molecular instructions that cells read and use.
Genes carry instructions, but the body does not use every instruction in every cell. A genetic change may influence a gene in the skin without producing the same effect in the liver, muscle or reproductive organs. The atlas lets researchers connect a specific genetic marker with the particular tissue and biological process it may influence, something single-tissue studies cannot do.
Why does tissue-specific gene activity matter?
Sheep have been selected over many generations for wool, body size, reproductive ability and other traits. The researchers wanted to know whether this long selection left detectable signatures on gene regulation — the switching of genes on and off.
To find out, they combined the new map with DNA from 52 ancient sheep spanning roughly 10,000 years. Comparing ancient and modern genetic material allowed the team to track how particular variants became more or less common over millennia.
The strongest signals of selection, they found, appeared in genetic changes that affected only one or a few tissues. Changes influencing many tissues at once showed weaker patterns of selection. The team also detected patterns in skin and reproductive tissues consistent with long-term selection for traits such as wool, pigmentation and reproduction.
What did the THNSL2 gene reveal?
One of the clearest examples involved THNSL2, a gene whose activity in sheep skin is linked to genetic variation. A variant of the gene associated with greater activity in skin generally became more common in European sheep from the Neolithic period through the Middle Ages.
The researchers are careful about what this means. The trend was not perfectly smooth, and they have not shown that the variant directly increases wool production. The result is a clue to investigate, not proof of a specific breeding effect.
That restraint runs through the whole study. The atlas does not yet provide a ready-made recipe for producing better wool or healthier animals. Its immediate value is explanatory: it offers a way to understand how thousands of years of human choices may have shaped sheep biology at the level of gene regulation.
Domestication, the researchers note, unfolded over many generations rather than through a single deliberate decision. Farmers repeatedly kept animals with useful characteristics, and environmental pressures shaped which sheep survived and reproduced. The new map provides another way to examine the biological traces of that slow, cumulative process.
What comes next?
Future studies will need to test promising variants in independent sheep populations and determine whether the knowledge improves breeding predictions. Until those tests are done, the practical payoff for breeders remains uncertain.
For now, the atlas stands as a reference: a detailed, tissue-by-tissue account of where in the body thousands of years of farming left their signature.
Ten millennia of shepherding, it turns out, were written in more than fleece.
via knowridge.com (Source)
More from Priya Raman
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Senior reporter covering people, launches and day-to-day practice in general science news at SciBeat.
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