DYM and spondyloepimetaphyseal dysplasia, matrilin-3 type: Dyggve–Melchior–Clausen syndrome and Smith-McCort dysplasia are recessive spondyloepimetaphyseal dysplasias caused by loss-of-function mutations in dymeclin (DYN) [57–59], the candidate gene closest to the marker at CFA7:79,570,691 associated with RCCL.