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- W1513604840 abstract "Synthesis of type I procollagen was examined in skin fibroblasts from a proband with a lethal variant of osteogenesis imperfecta. The fibroblasts synthesized shortened pro-alpha 2(I) chains and these shortened chains accounted for all the pro-alpha 2(I) chains synthesized by the cells. In addition, there was a decrease in the relative rate of synthesis of pro-alpha 2(I) chains. Fragmentation of the shortened pro-alpha 2(I) chains with vertebrate collagenase and cyanogen bromide demonstrated that the shortening was in alpha 2(I)-CB3,5A, a fragment from about the middle of the chain containing amino acid residues 361 to 775. Based on the relative mobility in electrophoretic gels, the shortening was about 20 amino acid residues. The decreased synthesis of pro-alpha 2(I) chains was demonstrated by an increase in the ratio for the rates of synthesis of pro-alpha 1(I):pro-alpha 2(I) chains. It was associated with an increase in the ratio of mRNAs for pro-alpha 1(I):pro-alpha 2(I) in the cells. Fibroblasts from the father also demonstrated a decreased synthesis of pro-alpha 2(I) chains as reflected by an increase in the ratio of newly synthesized pro-alpha 1(I):pro-alpha 2(I) chains. No shortened pro-alpha 2(I) chains were seen in fibroblasts from either the father or the mother. The observations suggested that the proband inherited a nonfunctioning pro-alpha 2(I) gene from her father and that the gene for the shortened pro-alpha 2(I) chain probably arose from a sporadic mutation." @default.
- W1513604840 created "2016-06-24" @default.
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- W1513604840 date "1983-06-01" @default.
- W1513604840 modified "2023-09-28" @default.
- W1513604840 title "Synthesis of a shortened pro-alpha 2(I) chain and decreased synthesis of pro-alpha 2(I) chains in a proband with osteogenesis imperfecta." @default.
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- W1513604840 doi "https://doi.org/10.1016/s0021-9258(18)32239-7" @default.
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