Cleidocranial dysplasia – genetics home reference

Cleidocranial dysplasia is a condition that primarily affects the development of the bones and teeth. Ear pain and headache on left side Signs and symptoms of cleidocranial dysplasia can vary widely in severity, even within the same family.

Individuals with cleidocranial dysplasia usually have underdeveloped or absent collarbones (clavicles). Fluid behind eardrum treatment As a result, their shoulders are narrow and sloping, can be brought unusually close together in front of the body, and in some cases the shoulders can be made to meet in the middle of the body.


Ear and throat pain on one side Delayed closing of the spaces between the bones of the skull (fontanels) is also characteristic of this condition. Middle ear effusion treatment The fontanels usually close in early childhood, but may remain open into adulthood in people with this disorder.

Affected individuals may be 3 to 6 inches shorter than other members of their family, and may have short, tapered fingers and broad thumbs ; short forearms; flat feet ; knock knees; and an abnormal curvature of the spine ( scoliosis ). Get rid of fluid in ear Characteristic facial features may include a wide, short skull ( brachycephaly ); a prominent forehead ; wide-set eyes ( hypertelorism ); a flat nose; and a small upper jaw.

Individuals with cleidocranial dysplasia may have decreased bone density (osteopenia) and may develop osteoporosis , a condition that makes bones progressively more brittle and prone to fracture, at a relatively early age. Fluid in ear toddler Women with cleidocranial dysplasia have an increased risk of requiring a cesarean section when delivering a baby, due to a narrow pelvis preventing passage of the infant’s head.

Dental abnormalities seen in cleidocranial dysplasia may include delayed loss of the primary (baby) teeth; delayed appearance of the secondary (adult) teeth; unusually shaped, peg-like teeth; misalignment of the teeth and jaws (malocclusion); and extra teeth , sometimes accompanied by cysts in the gums.

In addition to skeletal and dental abnormalities, people with cleidocranial dysplasia may have hearing loss and be prone to sinus and ear infections. Fluid in ear from allergies Some young children with this condition are mildly delayed in the development of motor skills such as crawling and walking, but intelligence is unaffected.

The RUNX2 gene provides instructions for making a protein that is involved in bone and cartilage development and maintenance. Ear and tooth pain This protein is a transcription factor, which means it attaches (binds) to specific regions of DNA and helps control the activity of particular genes. Left ear and jaw pain Researchers believe that the RUNX2 protein acts as a “master switch,” regulating a number of other genes involved in the development of cells that build bones (osteoblasts).

Some mutations change one protein building block ( amino acid ) in the RUNX2 protein. Fluid build up around the heart Other mutations introduce a premature stop signal that results in an abnormally short protein. Fluid on eardrum Occasionally, the entire gene is missing.

These genetic changes reduce or eliminate the activity of the protein produced from one copy of the RUNX2 gene in each cell, decreasing the total amount of functional RUNX2 protein. Fluid in ears adults This shortage of functional RUNX2 protein interferes with normal bone and cartilage development, resulting in the signs and symptoms of cleidocranial dysplasia. Cervical mucus in early pregnancy In rare cases, affected individuals may experience additional, unusual symptoms resulting from the loss of other genes near RUNX2.

In about one-third of individuals with cleidocranial dysplasia, no mutation in the RUNX2 gene has been found. Sinus fluid in ear The cause of the condition in these individuals is unknown.