Smith-McCort dysplasia (SMC) is a rare autosomal recessive spondylo-epimetaphyseal dysplasia with skeletal features identical to those of Dyggve-Melchior-Clausen disease [DS:H00757] but with normal intelligence and no microcephaly. SMC has been shown to result from mutations in the DYM gene, which encodes the Golgi protein DYMECLIN. Recently, a missense mutation in RAB33B has been identified in a SMC family. RAB33B is another Golgi protein involved in retrograde transport of Golgi vesicles.
