Dyggve Melchior Clausen Syndrome (DMC) is a rare genetic disorder that primarily affects the skeletal system. It is also known by several other names, including Dyggve-Melchior-Clausen syndrome, DMC syndrome, and Smith-McCort dysplasia. This condition is characterized by progressive skeletal abnormalities, intellectual disability, and other associated features.
Skeletal abnormalities: Individuals with DMC syndrome typically exhibit a range of skeletal abnormalities, including short stature, abnormal curvature of the spine (scoliosis), and a barrel-shaped chest. They may also have joint stiffness, particularly in the hips, knees, and elbows. These skeletal abnormalities can lead to mobility issues and may require orthopedic interventions.
Intellectual disability: Most individuals with DMC syndrome have some degree of intellectual disability. The severity can vary widely, ranging from mild to profound. Learning difficulties, delayed speech and language development, and impaired cognitive function are common features associated with this condition.
Other associated features: Additional features of DMC syndrome may include distinctive facial features, such as a prominent forehead, a flat nasal bridge, and a small chin. Some individuals may have dental abnormalities, hearing loss, or vision problems. In rare cases, individuals with DMC syndrome may also experience organ involvement, such as heart defects or liver abnormalities.
DMC syndrome is caused by mutations in the DYM gene, which is involved in the production of a protein called dymeclin. This protein plays a crucial role in the development and maintenance of various tissues, including bone and cartilage. The inheritance pattern of DMC syndrome is autosomal recessive, meaning that both parents must carry a copy of the mutated gene for their child to be affected.
Although there is currently no cure for DMC syndrome, treatment focuses on managing the symptoms and improving quality of life. This may involve a multidisciplinary approach, including regular medical evaluations, physical therapy, assistive devices, and educational support tailored to the individual's needs.