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COL9A2 allelotypes in intervertebral disc disease.

C Wrocklage1, H Wassmann, W Paulus

  • 1Institute of Neuropathology, Westfälische Wilhelms-Universität Münster, Münster, Germany.

Biochemical and Biophysical Research Communications
|December 19, 2000
PubMed
Summary
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A COL9A2 gene variation linked to intervertebral disc prolapse was identified. This genetic risk factor, a tryptophane substitution, was found in older patients, suggesting a role in age-related disc degeneration.

Area of Science:

  • Genetics
  • Biochemistry
  • Orthopedics

Background:

  • Intervertebral disc prolapse (IVDP) is a common condition with multifactorial causes.
  • Genetic factors are increasingly recognized as contributing to IVDP susceptibility.
  • A specific allelic variation in the COL9A2 gene has been implicated in IVDP risk.

Purpose of the Study:

  • To develop and validate a rapid screening method for a specific COL9A2 gene variant associated with IVDP.
  • To investigate the prevalence of this variant in a patient cohort and its correlation with clinical parameters.

Main Methods:

  • Development of a single enzyme (BsmFI) restriction assay for rapid genetic screening.
  • Validation of the assay by screening 250 patient disc tissue samples.
  • Confirmation of positive results using nucleotide sequencing.

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Main Results:

  • The tryptophane (Trp) allele at position 326 of the COL9A2 gene was identified in 1.2% of patients (3 out of 250).
  • Patients carrying the Trp allele were significantly older (70.7 years) at the time of their first prolapse compared to other patients (47.1 years).
  • The identified substitution occurs in a domain critical for collagen crosslinking.

Conclusions:

  • The identified COL9A2 allelic variation may serve as a genetic risk factor for intervertebral disc prolapse.
  • This allelotype potentially contributes to reduced collagen crosslinking and disc instability, particularly in the elderly.
  • The developed restriction assay provides an efficient tool for screening large populations for this IVDP risk factor.