ISSN:
1432-1076
Keywords:
Osteogenesis imperfecta type II
;
Collagen type I
;
Genetic defect
;
Alkaline phosphatase
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract We have examined collagen from a patient with the rare type IIC form of perinatally lethal osteogenesis imperfecta, in whom biochemical characteristics of hypophosphatasia were also apparent. In addition to normal α1(I) and α2(I) chains, there were chains overmodified along their lengths. Unexpectedly, the thermal stability of molecules containing these chains was normal. This suggests the existence of a structural mutation causing delayed triple helix formation, situated in either the α1(I) or α2(I) C-terminal propeptide. Since collagen synthesised by fibroblasts from each of the patient's parents was normal, the mutation was probably newly arising and dominant. In contrast to other reported cases of lethal osteogenesis imperfecta, not only was the secretion of collagen by cultured fibroblasts considerably retarded, but that of non-collagenous proteins was also severely impaired.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00442478
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