Osteogenesis imperfecta: cloning of a pro-alpha 2(I) collagen gene with a frameshift mutation.

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Citation

Pihlajaniemi T, Dickson LA, Pope FM, Korhonen VR, Nicholls A, Prockop DJ, Myers JC

Osteogenesis imperfecta: cloning of a pro-alpha 2(I) collagen gene with a frameshift mutation.

J Biol Chem. 1984 Nov 10;259(21):12941-4.

PubMed ID
6092353 [ View in PubMed
]
Abstract

Osteogenesis imperfecta (OI), a brittle-bone disorder, constitutes a major group of the inherited diseases of connective tissue. We have been studying an autosomal recessive form of OI in which the severely affected patient has inherited two abnormal pro-alpha 2(I) collagen alleles from consanguinous parents. Previously, nuclease S1 mapping was employed to localize a defect in the mRNA coding for the pro-alpha 2(I) collagen carboxyl-propeptide. The mutation prevents incorporation of pro-alpha 2(I) chains into the normal type I procollagen heterotrimer resulting in secretion of only pro-alpha 1(I) homotrimers. Here we report complete characterization of the corresponding region of the altered gene. Polyacrylamide gel electrophoresis and Southern blot hybridization showed a small homozygous deletion in the pro-alpha 2(I) collagen gene of the patient and a heterozygous pattern in both parents. Genomic cloning of the patient's DNA revealed a four nucleotide frameshift deletion in exon 1 near the end of translation which apparently instigates use of a new termination codon four nucleotides 3' to the original site. The mutation identified in this OI patient directly demonstrates the critical role of the carboxyl-propeptides in chain selection and assembly during the biosynthesis of procollagen.

DrugBank Data that Cites this Article

Polypeptides
NameUniProt ID
Collagen alpha-2(I) chainP08123Details