The definitive guide to genetic bone disorders, now revised and expanded with glossy photographs and radiographs "Brilliantly written and produced and deserves to be on the shelves of all pediatric radiologists. It should also be available to geneticists, counselors, and pediatricians." --Radiology This updated and expanded fourth edition of Bone Dysplasias presents age-related radiographs, photographs and clinical guidelines for more than 250 rare constitutional skeletal diseases. Focusing on diagnostically essential imaging and clinical features, each chapter is supplemented with prognostic and therapeutic information, a guide to differential diagnoses, and a short list of the most relevant publications. Organized in accordance with the most recent International Nosology and Classification of Genetic Skeletal Disorders, this new Bone Dysplasias distills the insights of a small, world-class author team on diagnosis and clinical approaches to this most difficult class of disorders.

A unique catalog of diagnostic radiographic images accompanied by relevant clinical description, differential diagnosis, and molecular genetic aspects, Bone Dysplasias is undoubtedly the single most helpful diagnostic reference for the diagnosis of genetic disorders of the skeleton.

Abstract: Odontochondrodysplasia (ODCD) is an unresolved genetic disorder of skeletal and dental development. Here, we show that ODCD is caused by hypomorphic TRIP11 mutations, and we identify ODCD as the nonlethal counterpart to achondrogenesis 1A (ACG1A), the known null phenotype in humans. TRIP11 encodes Golgi-associated microtubule-binding protein 210 (GMAP-210), an essential tether protein of the Golgi apparatus that physically interacts with intraflagellar transport 20 (IFT20), a component of the ciliary intraflagellar transport complex B. This association and extraskeletal disease manifestations in ODCD point to a cilium-dependent pathogenesis. However, our functional studies in patient-derived primary cells clearly support a Golgi-based disease mechanism. In spite of reduced abundance, residual GMAP variants maintain partial Golgi integrity, normal global protein secretion, and subcellular distribution of IFT20 in ODCD. These functions are lost when GMAP-210 is completely abrogated in ACG1A. However, a similar defect in chondrocyte maturation is observed in both disorders, which produces a cellular achondrogenesis phenotype of different severity, ensuing from aberrant glycan processing and impaired extracellular matrix proteoglycan secretion by the Golgi apparatus