SLC26A2 and diastrophic dysplasia: Variants in the SLC26A2 gene are linked to several chondrodysplasias, including autosomal recessive achondrogenesis type IB (ACG-1B), atelosteogenesis type 2 (AO2), diastrophic dysplasia (DTD), and multiple epiphyseal dysplasia type 4 (EDM-4).