Cartilage-Hair Hypoplasia, also known as metaphyseal chondrodysplasia, mckusick type, is related to metaphyseal dysplasia without hypotrichosis and anauxetic dysplasia 1. An important gene associated with Cartilage-Hair Hypoplasia is RMRP (RNA Component Of Mitochondrial RNA Processing Endoribonuclease), and among its related pathways/superpathways are RNA Polymerase I Promoter Opening and Assembly of the pre-replicative complex. Affiliated tissues include bone and skin, and related phenotypes are failure to thrive and eeg abnormality