Meyahealth
HomeGeneticsGeneRUNX2 gene
Back to Gene
RUNX2 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

RUNX2 gene

The RUNX2 gene acts as a master switch for bone and tooth development, and mutations in this gene are the primary cause of cleidocranial dysplasia.

Normal Function

The RUNX2 gene provides instructions for making a protein involved in the development and maintenance of teeth, bones, and cartilage. The RUNX2 protein is a transcription factor that attaches to specific regions of DNA to control the activity of other genes.

Researchers consider the RUNX2 protein a "master switch" because it regulates numerous genes involved in the development of osteoblasts (cells that build bone) and the formation of teeth.

Health Conditions Related to Genetic Changes

Cleidocranial dysplasia

Approximately 200 mutations in the RUNX2 gene have been identified in individuals with cleidocranial dysplasia, a condition affecting bone and tooth development.

  • Mutations may change a single amino acid, introduce a premature stop signal resulting in a nonfunctional protein, or involve the deletion of the entire gene.
  • These changes reduce the total amount of functional RUNX2 protein, which interferes with the normal development of the skeleton and teeth.

Other disorders

An extra copy (duplication) of a segment of the RUNX2 gene causes a disorder called metaphyseal dysplasia, maxillary hypoplasia, and brachydactyly (MDMHB). This condition is characterized by:

  • Abnormalities near the ends of long bones (metaphyses)
  • An underdeveloped upper jawbone (maxilla)
  • Short fingers (brachydactyly)

The extra genetic material is thought to alter the function of the RUNX2 protein and interfere with the maturation of osteoblasts.

Other Names for This Gene

  • CBF-alpha 1
  • CBFA1
  • CCD
  • CCD1
  • core-binding factor, runt domain, alpha subunit 1
  • MGC120022
  • MGC120023
  • OSF2
  • osteoblast-specific transcription factor 2
  • PEBP2aA
  • polyomavirus enhancer binding protein 2 alpha A subunit
  • RUNX2_HUMAN
  • SL3-3 enhancer factor 1 alpha A subunit
  • SL3/AKV core-binding factor alpha A subunit

Frequently Asked Questions

RUNX2‑related cleidocranial dysplasia follows an autosomal‑dominant pattern. Each pregnancy has a 50 % chance of inheriting the mutated allele. However, penetrance is high, so most carriers show at least mild skeletal or dental signs. Genetic counseling is recommended before family planning.
clinician can order a targeted sequencing panel or whole‑exome test that includes the RUNX2 gene. The report will list any pathogenic or likely‑pathogenic variants (missense, nonsense, frameshift, or whole‑gene deletions). A confirmed RUNX2 mutation together with the characteristic skeletal and dental findings establishes the diagnosis.
Children with RUNX2 mutations often have delayed eruption of permanent teeth, supernumerary (extra) teeth, and malformed roots. Management typically involves a multidisciplinary team: early orthodontic assessment, possible extraction of supernumerary teeth, and staged orthodontic or surgical‑assisted eruption of permanent teeth. Regular dental follow‑up every 6–12 months helps prevent crowding and infection.
While no therapy corrects the underlying RUNX2 defect, bone health can be supported with calcium‑rich foods, vitamin D supplementation, and weight‑bearing exercise. In some cases, endocrinologists may prescribe bisphosphonates to increase bone mineral density, but this is off‑label and requires careful monitoring for side effects.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

Meyahealth

Ⓒ 2026. All rights reserved by MEYA

About UsTerms & PolicyFAQ