New study maps the cells and genes behind bone disease
1st September 2026 – by TwinsUK
Researchers from TwinsUK at King’s College London have contributed to an international study that has created a detailed map of the cells and genes involved in keeping bones healthy — and what goes wrong in diseases such as osteoporosis. The findings, published in Nature Genetics, could help speed up the development of new treatments. The study also revealed a close relationship between blood vessels and bone, and between rare and common bone diseases.
Professor Emma Duncan, based at TwinsUK, was one of the senior researchers on the international team.
Why this matters
Osteoporosis and fractures are a huge health problem: roughly 1 in 3 women and 1 in 5 men over 50 will break a bone because their bones have become fragile. Yet progress on new treatments has been slow, largely because of gaps in our understanding of exactly which cells and genes keep bone strong.
What the researchers did
The team combined information from mice and humans to build the most detailed picture yet of bone biology.
Mapping the cells of bone. Using a technique called single-cell sequencing, they examined the layer of bone where it meets bone marrow — the site where old bone is broken down and new bone is built. This identified 34 different types of cells, falling into six broad groups. As expected, they found the classic bone-building cells (osteoblasts), cartilage cells (chondrocytes), and bone-dissolving cells (osteoclasts). But they also found that blood vessel cells play a bigger role than previously realised. Strikingly, more than half of the genes involved had never before been linked to bone health at all.
Checking against rare disease genes. The team compared their findings against the genes known to cause the more than 700 recognised rare bone diseases. Genes active in the bone-building and bone-dissolving cells overlapped strongly with genes that, when faulty, cause these rare inherited conditions.
Checking against common bone density. Using UK Biobank data, the researchers carried out the largest-ever genetic study of bone density, involving almost half a million people. This identified around 13,000 genetic markers, in over 1100 distinct regions, linked to bone strength. These same genes overlapped with both the cell-mapping results and the rare-disease gene list.
Testing in mice. Finally, the team confirmed in mouse models that these genes and cell types genuinely affect the skeleton.
Put together, this creates a three-way connection: the same cells, and the same genes, help explain both rare inherited bone conditions and the common bone-thinning that affects millions of people as they age.
Professor Emma Duncan, based at TwinsUK and a senior author on the study, said:
“By bringing together the genetic data with the information about individual cell types, this study helps us understand not just which genes are linked to skeletal disease, but where in the skeleton those genes are acting. This gives us a much clearer picture of the biology underlying bone health, and will help identify new targets for future treatment development.”
Why mice were needed
Healthy human bone tissue is very hard to obtain, for three reasons: bone is difficult to biopsy in the first place; it’s difficult to separate out individual cells without damaging them, since bone is so hard and calcified; and bone cells generally grow quite slowly compared with cells in most other tissues, making them time-consuming to study in the lab. Using mice let the team examine these cells much more closely, then check that the same patterns held true using human data from the UK Biobank and international rare disease registries.
What happens next
The researchers have made the resulting cellular and molecular framework available online for other scientists to use. The hope is that this map will help identify promising new drug targets — with the ultimate goal of identifying treatments that don’t just slow bone loss, but actually help rebuild and restore healthy bone.