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. 1984 Jul;81(14):4524–4528. doi: 10.1073/pnas.81.14.4524

Nuclease S1 mapping of a homozygous mutation in the carboxyl-propeptide-coding region of the pro alpha 2(I) collagen gene in a patient with osteogenesis imperfecta.

L A Dickson, T Pihlajaniemi, S Deak, F M Pope, A Nicholls, D J Prockop, J C Myers
PMCID: PMC345623  PMID: 6087329

Abstract

The molecular defect in a patient with a moderately severe form of osteogenesis imperfecta was characterized by nuclease S1 mapping. Single-stranded 5' and 3' end-labeled DNA probes coding for 80% of the carboxyl-propeptide of the pro alpha 2(I) collagen gene were hybridized to mRNA isolated from cultured fibroblasts of the patient and his parents. Nuclease S1 digestion revealed a homozygous mutation in the patient and a heterozygous pattern in the consanguineous parents. As a result of the defect in the gene, none of the pro alpha 2(I) chains synthesized by the patient's fibroblasts were incorporated into a type I procollagen heterotrimer consisting of two pro alpha 1(I) chains and one pro alpha 2(I) chain. Cultured skin fibroblasts from the patient have previously been shown to secrete only pro alpha 1(I) trimers. As shown here, fibroblasts from both parents, who do not have osteogenesis imperfecta, secrete both pro alpha 1(I) trimers and normal type I procollagen. A further observation was that synthesis of pro alpha 2(I) chains was decreased in fibroblasts from the patient and his parents. The decrease in the synthesis of pro alpha 2(I) chains is not caused by decreased transcription of the pro alpha 2(I) collagen alleles, since the pro alpha 1(I)/pro alpha 2(I) mRNA ratios were normal in the patient and his parents.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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