Sulfate Transporter-Related Osteochondrodysplasia

What Your Test Results Mean:

Carriers typically show no symptoms of sulfate transporter-related osteochondrodysplasia; however, carriers are at an increased risk of having a child with sulfate transporter-related osteochondrodysplasia. Risk for the current or future pregnancies is dependent on your partner’s carrier status. Carrier testing of your partner is recommended in addition to consultation with a genetic counselor.

Disease Explained:

Sulfate transporter-related osteochondrodysplasias are a group of inherited disorders of cartilage and bone formation. While caused by pathogenic variants in the same gene, the four disorders differ greatly in severity. Atelostelogenesis type 2 is the most serious form followed by Achondrogenesis type 1B, fatal before or shortly following birth. Diastrophic dysplasia is a more mild form characterized by short stature (very short extremities), protruding abdomens, and narrow chests. Affected individuals live to adulthood and typically have normal intelligence and mental function. Recessive multiple epiphyseal dysplasia is the most mild form of sulfate transporter-related osteochondrodysplasia characterized by joint pain, hand/foot deformities, and scoliosis. Treatment for the more severe forms is palliative while treatment for the milder forms is symptomatic. Lifespan varies greatly depending on the severity of the osteochondrodysplasia.

How the Genetics Works:

Sulfate transporter-related osteochondrodysplasia is an autosomal recessive disorder caused by pathogenic variants in the SLC26A2 gene. In general, individuals have two copies of the SLC26A2 gene. Carriers of sulfate transporter-related osteochondrodysplasia have a single variant in one copy of the SLC26A2 gene while individuals with sulfate transporter-related osteochondrodysplasia have variants in both copies of their genes, one inherited from each parent. Risk for two carriers to have a child with the disorder is 25%.

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