| Disease ID | Source | Name | Description |
| 119600 | OMIM | Cleidocranial dysplasia (CLCD) | Autosomal dominant skeletal disorder with high penetrance and variable expressivity. It is due to defective endochondral and intramembranous bone formation. Typical features include hypoplasia/aplasia of clavicles, patent fontanelles, wormian bones (additional cranial plates caused by abnormal ossification of the calvaria), supernumerary teeth, short stature, and other skeletal changes. In some cases defects in RUNX2 are exclusively associated with dental anomalies. The disease is caused by variants affecting the gene represented in this entry. |
| 156510 | OMIM | Metaphyseal dysplasia with maxillary hypoplasia with or without brachydactyly (MDMHB) | An autosomal dominant bone dysplasia characterized by metaphyseal flaring of long bones, enlargement of the medial halves of the clavicles, maxillary hypoplasia, variable brachydactyly, and dystrophic teeth. The disease is caused by variants affecting the gene represented in this entry. Analysis for copy-number variations revealed that a 105 kb duplication within RUNX2 segregated with the MDMHB phenotype in a region with maximum linkage. Real-time PCR for copy-number variation in genomic DNA in eight samples, as well as sequence analysis of fibroblast cDNA from one subject with MDMHB confirmed that affected family members were heterozygous for the presence of an intragenic duplication encompassing exons 3 to 5 of RUNX2. These three exons code for the Q/A domain and the functionally essential DNA-binding Runt domain of RUNX2. The RUNX2 duplication found in individuals with MDMHB leads to a gain of function (PubMed:23290074). |