Spondyloepiphyseal dysplasia with congenital joint dislocations, CHST3 type (SEDCJD, MIM 143095), also named recessive Larsen syndrome, is due to biallelic variants in the CHST3 gene, encoding for carbohydrate sulfotransferase-3, also known as chondroitin 6-sulfotransferase 1 (C6ST-1). Here, CHST3 is linked to spondyloepiphyseal dysplasia.