Health · Medical Research · 6 hrs ago
Study links RUNX2 pathway to bone resorption and delayed tooth eruption
Researchers at Peking University studied how RUNX2 affects bone-resorbing cells and tooth eruption.
Cleidocranial dysplasia, or CCD, is a skeletal disorder linked to RUNX2 changes and can cause delayed permanent teeth, extra teeth and collarbone defects.
A patient with a RUNX2 mutation and mice with reduced RUNX2 had fewer bone-resorbing cells and signs of impaired bone breakdown.
The team found that RUNX2 activates LncRNA-ROD, which helps control the development and function of these cells.
LncRNA-ROD works by binding the protein QKI, helping maintain CSF1R levels that support bone-resorbing cells.
Mice lacking parts of this pathway resisted bone loss in experiments that mimic loss of estrogen, but the findings do not show that the pathway can restore tooth eruption.
The pathway may offer a target for future therapies, although researchers say more tests are needed, including experiments focused on bone around the teeth and on bone formation.
Researchers reported that the RUNX2–LncRNA-ROD–QKI pathway helps regulate osteoclast differentiation and bone resorption.
The study linked reduced RUNX2 activity to fewer osteoclasts, impaired bone resorption and delayed tooth eruption in mouse models.
A patient with cleidocranial dysplasia had denser alveolar bone and no detectable TRAP-positive osteoclasts.
The researchers said the pathway may be a target for future therapies but cautioned that the study did not show it could reverse tooth-eruption defects.
- Who
- Researchers at Peking University School and Hospital of Stomatology conducted the study.
- What
- They investigated how the RUNX2–LncRNA-ROD–QKI pathway affects osteoclast differentiation and bone resorption.
- When
- The findings were reported on 28 September 2026.
- Where
- The study was conducted by researchers in Beijing, China, and reported in the International Journal of Oral Science.
- Why
- To clarify how RUNX2 and lncRNAs regulate osteoclast differentiation and alveolar bone remodeling.
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- Pathway
- RUNX2–LncRNA-ROD–QKI
- Patient mutation
- RUNX2 c.557G>C; R186T
- LncRNA-ROD length
- 1,147 base pairs
- Mouse eruption finding
- Delayed mandibular first-molar eruption at postnatal days 11 and 13
- Study DOI
- 10.1038/s41368-026-00466-z