Desbuquois syndrome

Desbuquois syndrome (also known as Desbuquois dysplasia) is a rare autosomal recessive skeletal dysplasia characterized by severe prenatal and postnatal growth retardation, joint laxity, and distinctive skeletal abnormalities. The condition was first described by Georges Desbuquois in 1966. It primarily affects the skeletal system, with key features including short stature (often severe), round face, prominent bulging eyes, midface hypoplasia, and characteristic hand anomalies such as an extra ossification center adjacent to the second metacarpal (the so-called 'monkey wrench' or 'Swedish key' appearance on X-ray). Joint hyperlaxity is a hallmark feature and can lead to dislocations. Progressive scoliosis and kyphosis may also develop. Two main subtypes have been recognized: Type 1 (with the characteristic hand changes) and Type 2 (without the hand changes). Desbuquois syndrome is caused by mutations in several genes involved in proteoglycan biosynthesis and cartilage development, including CANT1 (calcium-activated nucleotidase 1), XYLT1, XYLT2, and B3GALT6, among others. The CANT1 gene is the most commonly implicated. These genes play critical roles in glycosaminoglycan synthesis, which is essential for normal cartilage and bone development. The condition can be associated with respiratory difficulties in infancy due to a narrow thorax, intellectual disability in some cases, and progressive joint and skeletal complications. There is currently no cure or disease-specific treatment for Desbuquois syndrome. Management is supportive and multidisciplinary, focusing on orthopedic interventions for skeletal deformities (including scoliosis management and treatment of joint dislocations), respiratory support when needed, physical therapy to optimize mobility, and monitoring of growth and development. Genetic counseling is recommended for affected families. Prognosis varies depending on the severity of skeletal and respiratory involvement, but many individuals survive into adulthood with appropriate supportive care.

Common questions about Desbuquois syndrome