Article: article from journal or magazin.
Case report (case report): feedback on an observation with a short commentary.
A specific collagen type II gene (COL2A1) mutation presenting as spondyloperipheral dysplasia.
American Journal of Medical Genetics
Publication types: Case Reports ; Journal Article ; Research Support, Non-U.S. Gov't
We report on a patient with a skeletal dysplasia characterized by short stature, spondylo-epiphyseal involvement, and brachydactyly E-like changes. This condition has been described as spondyloperipheral dysplasia and the few published cases suggest autosomal dominant inheritance with considerable clinical variability. We found our sporadic case to be due to a collagen type II defect resulting from a specific COL2A1 mutation. This mutation is the first to be located at the C-terminal outside the helical domain of COL2A1. A frameshift as consequence of a 5 bp duplication in exon 51 leads to a stop codon. The resulting truncated C-propeptide region seems to affect helix formation and produces changes of chondrocyte morphology, collagen type II fibril structure and cartilage matrix composition. Our case with its distinct phenotype adds another chondrodysplasia to the clinical spectrum of type II collagenopathies.
Amino Acid Sequence, Base Sequence, Bone Development, Bone and Bones/pathology, Bone and Bones/radiography, Collagen/genetics, DNA/blood, Endoplasmic Reticulum, Rough/pathology, Endoplasmic Reticulum, Rough/ultrastructure, Exons, Female, Frameshift Mutation, Growth Plate/pathology, Growth Plate/ultrastructure, Humans, Ilium, Infant, Newborn, Leukocytes/metabolism, Microscopy, Electron, Molecular Sequence Data, Osteochondrodysplasias/genetics, Osteochondrodysplasias/pathology, Polymerase Chain Reaction
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