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. 1989 Jul;45(1):5–15.

Type II collagen defects in the chondrodysplasias. I. Spondyloepiphyseal dysplasias.

L W Murray 1, J Bautista 1, P L James 1, D L Rimoin 1
PMCID: PMC1683381  PMID: 2741952

Abstract

The spondyloepiphyseal dysplasias (SEDs) and spondyloepimetaphyseal dysplasias (SEMDs) are a heterogeneous group of skeletal dysplasias (dwarfing disorders) characterized by abnormal epiphyses, with and without varying degrees of metaphyseal irregularities, flattened vertebral bodies, and myopia. To better define the underlying cause of these disorders, we have analyzed the collagens from costal cartilage from several of these patients, using SDS-polyacrylamide gel electrophoresis (SDS-PAGE) and high-performance liquid chromatography (HPLC) of intact chains and cyanogen bromide (CNBr) peptides and amino acid analysis. In almost all of the patients in this study group, the type II collagen exhibited a slower electrophoretic mobility when compared with that in normal controls. The mobility of many, but not all, of the CNBr peptides was also retarded. Peptides near the amino terminus were almost always altered, while the mobility of peptides close to the carboxyl terminus were normal in all but the severely affected cases. Analysis of the CNBr peptides on an HPLC sieving column confirmed that the electrophoretically abnormal peptides were of a higher molecular weight than were control peptides. Amino acid analysis indicated that the abnormal collagens have a higher ratio of hydroxylysine to lysine than does control collagen, suggesting that overmodification may be involved in the altered mobility. Our results are consistent with a defect in the collagen helix that results in overmodification of the molecule from that point toward the amino terminus. We propose that some forms of SED and SEMD are associated with abnormalities in type II collagen that results in delayed helix formation and consequent overmodification of the collagen. Cases of SED fit onto a continuous spectrum of clinical severity that correlates positively with both the extent of alteration and the proximity of the defect to the carboxyl terminus.

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Selected References

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