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The prevalence of thanatophoric dysplasia and lethal osteogenesis imperfecta type II in Northern Ireland - a complete population study.

ABSTRACT: The minimum prevalence of lethal Osteogenesis imperfecta type II, thanatophoric dysplasia and achondroplasia were derived following detailed case note review of all perinatal lethal skeletal dysplasias (SD) in Northern Ireland over a 12 year period. Multiple sources of ascertainment, including genetic notes, radiological reports and post mortem findings, were used. 39 cases were identified. Thanatophoric dysplasia was the commonest diagnosis made (22), followed by osteogenesis imperfecta type II (four children) and achondroplasia (two children). Eleven other diagnoses each occurred once in the 12 year period. The minimum prevalence range, per live births, of each of the common skeletal dysplasias in Northern Ireland has been calculated; thanatophoric dysplasia 0.80/10,000, osteogenesis imperfecta type II 0.15/10,000 and achondroplasia 0.07/10,000. The prevalence range for thanatophoric dysplasia is much higher than reported in previous studies. We discuss reasons for the prevalence figures obtained.

SUBMITTER: Donnelly DE

PROVIDER: S-EPMC3284715 | biostudies-literature | 2010 Sep

REPOSITORIES: biostudies-literature

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The prevalence of thanatophoric dysplasia and lethal osteogenesis imperfecta type II in Northern Ireland - a complete population study.

Donnelly Deirdre E DE McConnell Vivienne V Paterson Anne A Morrison Patrick J PJ

The Ulster medical journal 20100901 3

The minimum prevalence of lethal Osteogenesis imperfecta type II, thanatophoric dysplasia and achondroplasia were derived following detailed case note review of all perinatal lethal skeletal dysplasias (SD) in Northern Ireland over a 12 year period. Multiple sources of ascertainment, including genetic notes, radiological reports and post mortem findings, were used. 39 cases were identified. Thanatophoric dysplasia was the commonest diagnosis made (22), followed by osteogenesis imperfecta type II ...[more]

PMID: 22375084

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Project description:CONTEXT:Type VIII osteogenesis imperfecta (OI; OMIM 601915) is a recessive form of lethal or severe OI caused by null mutations in P3H1, which encodes prolyl 3-hydroxylase 1. OBJECTIVES:Clinical and bone material description of non-lethal type VIII OI. DESIGN:Natural history study of type VIII OI. SETTING:Pediatric academic research centers. PATIENTS:Five patients with non-lethal type VIII OI, and one patient with lethal type VIII OI. INTERVENTIONS:None. MAIN OUTCOME MEASURES:Clinical examinations included bone mineral density, radiographs, and serum and urinary metabolites. Bone biopsy samples were analyzed for histomorphometry and bone mineral density distribution by quantitative backscattered electron imaging microscopy. Collagen biochemistry was examined by mass spectrometry, and collagen fibrils were examined by transmission electron microscopy. RESULTS:Type VIII OI patients have extreme growth deficiency, an L1-L4 areal bone mineral density Z-score of -5 to -6, and normal bone formation markers. Collagen from bone and skin tissue and cultured osteoblasts and fibroblasts have nearly absent 3-hydroxylation (1-4%). Collagen fibrils showed abnormal diameters and irregular borders. Bone histomorphometry revealed decreased cortical width and very thin trabeculae with patches of increased osteoid, although the overall osteoid surface was normal. Quantitative backscattered electron imaging showed increased matrix mineralization of cortical and trabecular bone, typical of other OI types. However, the proportion of bone with low mineralization was increased in type VIII OI bone, compared to type VII OI. CONCLUSIONS:P3H1 is the unique enzyme responsible for collagen 3-hydroxylation in skin and bone. Bone from non-lethal type VIII OI children is similar to type VII, especially bone matrix hypermineralization, but it has distinctive features including extremely thin trabeculae, focal osteoid accumulation, and an increased proportion of low mineralized bone.

Dataset Information

The prevalence of thanatophoric dysplasia and lethal osteogenesis imperfecta type II in Northern Ireland - a complete population study.

Publications

The prevalence of thanatophoric dysplasia and lethal osteogenesis imperfecta type II in Northern Ireland - a complete population study.

Similar Datasets

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