| A rare genetic bone disorder with characteristics of chondrodysplasia, intrauterine growth retardation, hydrocephaly and facial dysmorphism in the affected males. The disease is severe and probably lethal in males, the clinical picture in females is less severe. The disease is due to a mutation in the histone deacetylase 6 HDAC6 gene (Xp11.3-q13.1) that causes a nucleotide substitution in the 3' untranslated region (UTR) of the HDAC6 transcript. This mutation lies in the seed sequence of microRNA-433 (hsa-miR-433) and abolishes the post-transcriptional regulation of HDAC6 expression by hsa-miR-433, resulting in the overexpression of the HDAC6 protein. Inheritance is X-linked dominant. |
