Chondrodysplasia with joint dislocations, gPAPP type

Chondrodysplasia with joint dislocations, gPAPP type (also known as IMPAD1-related chondrodysplasia or chondrodysplasia with joint dislocations, GPAPP type) is an extremely rare autosomal recessive skeletal disorder caused by mutations in the IMPAD1 gene, which encodes the Golgi-resident phosphoadenosine phosphate 3'-phosphoatase (gPAPP). This enzyme plays a critical role in proteoglycan sulfation and chondroitin sulfate biosynthesis, processes essential for normal cartilage and bone development. The condition primarily affects the skeletal system and is characterized by short stature, chondrodysplasia (abnormal cartilage and bone development), and multiple joint dislocations. Key clinical features include short limbs (micromelia), brachydactyly (short fingers and toes), joint hypermobility with recurrent dislocations, and distinctive facial features. Skeletal radiographs may reveal abnormalities in the long bones, vertebrae, and epiphyses. Additional features can include cleft palate and other craniofacial anomalies. There is currently no specific or curative treatment for this condition. Management is supportive and symptomatic, focusing on orthopedic interventions for joint instability and dislocations, physical therapy to maintain mobility, and surgical correction of skeletal deformities when necessary. Multidisciplinary care involving clinical geneticists, orthopedic surgeons, and rehabilitation specialists is recommended. Given the extreme rarity of this disorder, knowledge about its full clinical spectrum and long-term prognosis remains limited.

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