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The developmentally regulated type X collagen gene contains a long open reading frame without introns

, : The developmentally regulated type X collagen gene contains a long open reading frame without introns. Journal of Biological Chemistry 261(11): 5041-5050

Type X collagen is a recently discovered product of hypertrophic chondrocytes tht is localized to presumptive mineralization zones of hyaline cartilage. Thus, in the epiphyseal growth plate of long bones it is present only in the zone of hypertrophic chondrocytes and absent in the resting and rapidly growing cartilage and in bone. Type X collagen represents, therefore, a transient and developmentally regulated collagen which is synthesized by a subpopulation of chondrocytes. We report here the isolation and characterization of cDNA and genomic clones specific for the chicken protein. The results demonstrate that the polypeptide chains of this collagen contain three distinct domains: a short non-collagenous, amino-terminal region, a collagenous domain of 460 domain of 460 amino acid residues, and a non-collagenous, carboxyl-terminal domain of 170 amino acid residues. The nucleotide sequence of the gene shows that these domains are encoded by a long open reading frame that is not interrupted by introns. Examination of the amino acid sequence derived from this nucleotide sequence reveals the presence of a hydrophobic segment localized 10 amino acid residues upstream from the translational stop codon. The length and sequence characteristics of this segment raise the intriguing possibility that Type X collagen polypeptides may contain a transmembrane segment.

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Accession: 006628048

PMID: 3082876

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