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The phenotypic spectrum in patients with arginine to cysteine mutations in the COL2A1 gene
  1. K P Hoornaert1,
  2. C Dewinter1,
  3. I Vereecke1,
  4. F A Beemer2,
  5. W Courtens3,
  6. A Fryer4,
  7. H Fryssira5,
  8. M Lees6,
  9. A Müllner-Eidenböck7,
  10. D L Rimoin8,
  11. L Siderius9,
  12. A Superti-Furga10,
  13. K Temple11,
  14. P J Willems12,
  15. A Zankl13,
  16. C Zweier14,
  17. A De Paepe1,
  18. P Coucke1,
  19. G R Mortier1
  1. 1Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
  2. 2Department of Medical Genetics, University Medical Center Utrecht, Utrecht, the Netherlands
  3. 3Department of Medical Genetics, Antwerp University Hospital, Antwerp, Belgium
  4. 4Department of Clinical Genetics, Royal Liverpool Children’s Hospital, Liverpool, UK
  5. 5Department of Medical Genetics, Aghia Sophia Children’s Hospital, Athens, Greece
  6. 6Department of Clinical Genetics, Institute of Child Health, London, UK
  7. 7Department of Ophthalmology, Medical University of Vienna, Vienna, Austria
  8. 8Medical Genetics Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA
  9. 9Department of Pediatrics, Hilversum Hospital, Hilversum, the Netherlands
  10. 10Center for Pediatrics and Adolescent Medicine, Freiburg University Hospital, Freiburg, Germany
  11. 11Wessex Clinical Genetics Service, Southampton University, Southampton, UK
  12. 12Gendia, Antwerp, Belgium
  13. 13Division de Pediatrie Moleculaire, Clinique Infantile, Lausanne, Switzerland
  14. 14Institut für Humangenetik, Erlangen, Germany
  1. Correspondence to:
 Geert Mortier
 Center for Medical Genetics, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium; geert.mortier{at}ugent.be

Abstract

Background: The majority of COL2A1 missense mutations are substitutions of obligatory glycine residues in the triple helical domain. Only a few non-glycine missense mutations have been reported and among these, the arginine to cysteine substitutions predominate.

Objective: To investigate in more detail the phenotype resulting from arginine to cysteine mutations in the COL2A1 gene.

Methods: The clinical and radiographic phenotype of all patients in whom an arginine to cysteine mutation in the COL2A1 gene was identified in our laboratory, was studied and correlated with the abnormal genotype. The COL2A1 genotyping involved DHPLC analysis with subsequent sequencing of the abnormal fragments.

Results: Six different mutations (R75C, R365C, R519C, R704C, R789C, R1076C) were found in 11 unrelated probands. Each mutation resulted in a rather constant and site-specific phenotype, but a perinatally lethal disorder was never observed. Spondyloarthropathy with normal stature and no ocular involvement were features of patients with the R75C, R519C, or R1076C mutation. Short third and/or fourth toes was a distinguishing feature of the R75C mutation and brachydactyly with enlarged finger joints a key feature of the R1076C substitution. Stickler dysplasia with brachydactyly was observed in patients with the R704C mutation. The R365C and R789C mutations resulted in classic Stickler dysplasia and spondyloepiphyseal dysplasia congenita (SEDC), respectively.

Conclusions: Arginine to cysteine mutations are rather infrequent COL2A1 mutations which cause a spectrum of phenotypes including classic SEDC and Stickler dysplasia, but also some unusual entities that have not yet been recognised and described as type II collagenopathies.

  • MED, multiple epiphyseal dysplasia
  • SEDC, spondyloepiphyseal dysplasia congenita
  • arginine to cysteine mutation
  • COL2A1
  • spondyloarthropathy
  • spondyloepiphyseal dysplasia congenital
  • Stickler syndrome

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Footnotes

  • Published Online First 9 September 2005

  • This study is supported, in part, by the Fund for Scientific Research, Flanders (GM is senior clinical investigator) and by the Fifth Framework of the specific research and technological development program “Quality of Life and Management of Living Resources” of the European Commission (Contract QLG1-CT-2001-02188).

  • Competing interests: none declared

  • Informed consent was obtained for the publication of patient details and images

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