Article (Scientific journals)
Type I collagen triplet duplication mutation in lethal osteogenesis imperfecta shifts register of alpha chains throughout the helix and disrupts incorporation of mutant helices into fibrils and extracellular matrix.
Cabral, Wayne A; Mertts, Marianna V; Makareeva, Elena et al.
2003In Journal of Biological Chemistry, 278 (12), p. 10006-12
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Keywords :
Adult; Amino Acid Sequence; Base Sequence; Collagen Type I/chemistry/genetics; Extracellular Matrix/metabolism; Female; Humans; Male; Molecular Sequence Data; Mutation/genetics; Osteogenesis Imperfecta/genetics/metabolism; Procollagen/metabolism; Repetitive Sequences, Amino Acid/genetics
Abstract :
[en] The majority of collagen mutations causing osteogenesis imperfecta (OI) are glycine substitutions that disrupt formation of the triple helix. A rare type of collagen mutation consists of a duplication or deletion of one or two Gly-X-Y triplets. These mutations shift the register of collagen chains with respect to each other in the helix but do not interrupt the triplet sequence, yet they have severe clinical consequences. We investigated the effect of shifting the register of the collagen helix by a single Gly-X-Y triplet on collagen assembly, stability, and incorporation into fibrils and matrix. These studies utilized a triplet duplication in COL1A1 exon 44 that occurred in the cDNA and gDNA of two siblings with lethal OI. The normal allele encodes three identical Gly-Ala-Hyp triplets at aa 868-876, whereas the mutant allele encodes four. The register shift delays helix formation, causing overmodification. Differential scanning calorimetry yielded a decrease in T(m) of 2 degrees C for helices with one mutant chain and a 6 degrees C decrease in helices with two mutant chains. An in vitro binary co-processing assay of N-proteinase cleavage demonstrated that procollagen with the triplet duplication has slower N-propeptide cleavage than in normal controls or procollagen with proalpha1(I) G832S, G898S, or G997S substitutions, showing that the register shift persists through the entire helix. The register shift disrupts incorporation of mutant collagen into fibrils and matrix. Proband fibrils formed inefficiently in vitro and contained only normal helices and helices with a single mutant chain. Helices with two mutant chains and a significant portion of helices with one mutant chain did not form fibrils. In matrix deposited by proband fibroblasts, mutant chains were abundant in the immaturely cross-linked fraction but constituted a minor fraction of maturely cross-linked chains. The profound effects of shifting the collagen triplet register on chain interactions in the helix and on fibril formation correlate with the severe clinical consequences.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Cabral, Wayne A;  National Institutes of Health, Bethesda, Maryland - USA > Section on connective Tissue Disorders
Mertts, Marianna V;  National Institutes of Health, Bethesda, Maryland -USA > Section on Physical Biochemistry
Makareeva, Elena;  National Institutes of Health, Bethesda, Maryland - USA > Section on Physical Biochemistry
Colige, Alain ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Laboratoire des tissus conjonctifs
Tekin, Mustafa;  MCV/VCU, Richmond, Virginia > Dpt of Human Genetics
Pandya, Arti;  MCV/VCU, Richmond, Virginia > Dpt of Human Genetics
Leikin, Sergey;  National Institutes of Health, Bethesda, Maryland- USA > Section on Physical Biochemistry
Marini, Joan C;  National Institutes of Health, Bethesda, Maryland - USA > Section on Connective Tissue Disorders
Language :
English
Title :
Type I collagen triplet duplication mutation in lethal osteogenesis imperfecta shifts register of alpha chains throughout the helix and disrupts incorporation of mutant helices into fibrils and extracellular matrix.
Publication date :
2003
Journal title :
Journal of Biological Chemistry
ISSN :
0021-9258
eISSN :
1083-351X
Publisher :
American Society for Biochemistry and Molecular Biology, Baltimore, United States - Maryland
Volume :
278
Issue :
12
Pages :
10006-12
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 19 February 2010

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