Short answer · Medically reviewed summary · Last updated: 2026-05-08
Cleidocranial dysplasia is a rare genetic condition caused by mutations in the RUNX2 gene, which is essential for bone and tooth development. This genetic alteration disrupts the normal formation of skeletal structures, particularly affecting the collarbones and dental growth, and is inherited in an autosomal dominant pattern. What exactly causes Cleidocranial dysplasia? The primary cause of Cleidocranial dysplasia is a mutation in the RUNX2 gene located on chromosome 6p21.
1 people with Cleidocranial Dysplasia have shared their first-person experience on this question at DiseaseMaps.
Which are the causes of Cleidocranial Dysplasia?
Causes of Cleidocranial Dysplasia explained: genetic and environmental factors, reviewed against medical sources, plus patient perspectives.
Cleidocranial dysplasia is a rare genetic condition caused by mutations in the RUNX2 gene, which is essential for bone and tooth development. This genetic alteration disrupts the normal formation of skeletal structures, particularly affecting the collarbones and dental growth, and is inherited in an autosomal dominant pattern.
What exactly causes Cleidocranial dysplasia?
The primary cause of Cleidocranial dysplasia is a mutation in the RUNX2 gene located on chromosome 6p21. This gene acts as a "master switch" for osteoblasts, the cells responsible for building bone. When RUNX2 is mutated, it fails to signal the body to properly form or ossify certain skeletal tissues, leading to the characteristic features of Cleidocranial dysplasia, such as absent or underdeveloped clavicles and delayed closure of the skull's fontanelles.
Is Cleidocranial dysplasia hereditary?
Yes, Cleidocranial dysplasia follows an autosomal dominant inheritance pattern. This means that an affected individual has a 50% chance of passing the mutation to each of their children. However, it is important to note that approximately 30% to 40% of cases arise from a de novo (spontaneous) mutation, meaning the condition occurs in an individual with no family history of Cleidocranial dysplasia.
Are there environmental or other triggers?
Current medical consensus confirms that Cleidocranial dysplasia is strictly a genetic disorder. There are no known environmental triggers, infectious agents, or metabolic conditions that cause this disease. Research into the etiology of the condition focuses on the following areas:
- Identifying the specific location of the RUNX2 mutation to predict clinical severity.
- Studying how haploinsufficiency (having only one functional copy of the gene) affects dental eruption pathways.
- Developing gene-targeted therapies to stimulate bone mineral density in pediatric patients.
Next steps
- Consult with a clinical geneticist to confirm the diagnosis through molecular genetic testing.
- Connect with the 89 members of the Cleidocranial dysplasia community on DiseaseMaps.org for peer support.
- Schedule a consultation with a specialized orthodontist or craniofacial surgeon familiar with the unique dental needs associated with this condition.
Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.
References
- NIH Genetic and Rare Diseases Information Center (GARD): Cleidocranial dysplasia.
- OMIM (Online Mendelian Inheritance in Man): RUNX2 Gene Entry #600211.
- Orphanet: Cleidocranial dysplasia (ORPHA:201).
- Children's Craniofacial Association: Resources for Cleidocranial dysplasia.
Posted May 16, 2017 by Paige 600
