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A specific collagen type II gene (COL2A1) mutation presenting as spondyloperipheral dysplasia

✍ Scribed by Zabel, Bernhard; Hilbert, Katja; Stöß, Hartmut; Superti-Furga, Andrea; Spranger, Jürgen; Winterpacht, Andreas

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
64 KB
Volume
63
Category
Article
ISSN
0148-7299

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✦ Synopsis

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 spondyloperiph-era1 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 I1 defect resulting from a specific COL2Al 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 I1 fibril structure and cartilage matrix composition. Our case with its distinct phenotype adds another chondrodysplasia to the clinical spectrum of type I1 collagenopathies.

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