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. 1994 Feb;54(2):169–178.

Amino acid substitutions of conserved residues in the carboxyl-terminal domain of the alpha 1(X) chain of type X collagen occur in two unrelated families with metaphyseal chondrodysplasia type Schmid.

G A Wallis 1, B Rash 1, W A Sweetman 1, J T Thomas 1, M Super 1, G Evans 1, M E Grant 1, R P Boot-Handford 1
PMCID: PMC1918153  PMID: 8304336

Abstract

Type X collagen is a homotrimeric, short-chain, nonfibrillar extracellular-matrix component that is specifically and transiently synthesized by hypertrophic chondrocytes at the sites of endochondral ossification. The precise function of type X collagen is not known, but its specific pattern of expression suggests that mutations within the encoding gene (COL10A1) that alter the structure or synthesis of the protein may cause heritable forms of chondrodysplasia. We used the PCR and the SSCP techniques to analyze the coding and upstream promoter regions of the COL10A1 gene in a number of individuals with forms of chondrodysplasia. Using this approach, we identified two individuals with metaphyseal chondrodysplasia type Schmid (MCDS) with SSCP changes in the region of the gene encoding the carboxyl-terminal domain. Sequence analysis demonstrated that the individuals were heterozygous for two unique single-base-pair transitions that led to the substitution of the highly conserved amino acid residue tyrosine at position 598 by aspartic acid in one person and of leucine at position 614 by proline in the other. The substitution at residue 598 segregated with the phenotype in a family of eight (five affected and three unaffected) related persons. The substitution at residue 614 occurred in a sporadically affected individual but not in her unaffected mother and brother. Additional members of this family were not available for further study. These results suggest that certain amino acid substitutions within the carboxyl-terminal domain of the chains of the type X collagen molecule cause MCDS. These amino acid substitutions are likely to alter either chain recognition or assembly of the type X collagen molecule, thereby depleting the amount of normal type X collagen deposited in the extracellular matrix, with consequent aberrations in bone growth and development.

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Selected References

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