Article (Scientific journals)
Three arginine to cysteine substitutions in the pro-alpha (I)-collagen chain cause Ehlers-Danlos syndrome with a propensity to arterial rupture in early adulthood.
Malfait, Fransiska; Symoens, Sofie; De Backer, Julie et al.
2007In Human Mutation, 28 (4), p. 387-95
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Keywords :
Adolescent; Adult; Amino Acid Substitution; Arginine/genetics/metabolism; Base Sequence; Bone Diseases, Metabolic/complications/genetics/metabolism; Collagen/genetics; Collagen Type I/genetics/metabolism; Collagen Type III/genetics; Cysteine/genetics/metabolism; Ehlers-Danlos Syndrome/complications/genetics/metabolism; Female; Femoral Artery; Humans; Iliac Artery; Male; Molecular Sequence Data; Mutation, Missense; Protein Structure, Secondary; RNA, Messenger/genetics; Rupture, Spontaneous/genetics
Abstract :
[en] Mutations in the COL1A1 and COL1A2 genes, encoding the proalpha1 and 2 chains of type I collagen, cause osteogenesis imperfecta (OI) or Ehlers-Danlos syndrome (EDS) arthrochalasis type. Although the majority of missense mutations in the collagen type I triple helix affect glycine residues in the Gly-Xaa-Yaa repeat, few nonglycine substitutions have been reported. Two arginine-to-cysteine substitutions in the alpha1(I)-collagen chain are associated with classic EDS [R134C (p.R312C)] or autosomal dominant Caffey disease with mild EDS features [R836C (p.R1014C)]. Here we show alpha1(I) R-to-C substitutions in three unrelated patients who developed iliac or femoral dissection in early adulthood. In addition, manifestations of classic EDS in Patient 1 [c.1053C>T; R134C (p.R312C); X-position] or osteopenia in Patients 2 [c.1839C>T; R396C (p.R574C); Y-position] and 3 [c.3396C>T; R915C (p.R1093C); Y-position] are seen. Dermal fibroblasts from the patients produced disulfide-bonded alpha1(I)-dimers in approximately 20% of type I collagen, which were efficiently secreted into the medium in case of the R396C and R915C substitution. Theoretical stability calculations of the collagen type I heterotrimer and thermal denaturation curves of monomeric mutant alpha1(I)-collagen chains showed minor destabilization of the collagen helix. However, dimers were shown to be highly unstable. The R134C and R396C caused delayed procollagen processing by N-proteinase. Ultrastructural findings showed collagen fibrils with variable diameter and irregular interfibrillar spaces, suggesting disturbed collagen fibrillogenesis. Our findings demonstrate that R-to-C substitutions in the alpha1(I) chain may result in a phenotype with propensity to arterial rupture in early adulthood. This broadens the phenotypic range of nonglycine substitutions in collagen type I and has important implications for genetic counseling and follow-up of patients carrying this type of mutation.
Disciplines :
Surgery
Author, co-author :
Malfait, Fransiska
Symoens, Sofie
De Backer, Julie
Hermanns-Lê, Trinh 
Sakalihasan, Natzi ;  Centre Hospitalier Universitaire de Liège - CHU > Chirurgie cardio-vasculaire
Lapiere, Charles M
Coucke, Paul
De Paepe, Anne
Language :
English
Title :
Three arginine to cysteine substitutions in the pro-alpha (I)-collagen chain cause Ehlers-Danlos syndrome with a propensity to arterial rupture in early adulthood.
Publication date :
2007
Journal title :
Human Mutation
ISSN :
1059-7794
eISSN :
1098-1004
Publisher :
Wiley Liss, Hoboken, United States - New Jersey
Volume :
28
Issue :
4
Pages :
387-95
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Copyright 2007 Wiley-Liss, Inc.
Available on ORBi :
since 01 March 2011

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