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Characterization of the COL2A1 VNTR polymorphism

E S Berg1, B Olaisen

  • 1Institute of Forensic Medicine, University of Oslo, Rikshospitalet, Norway.

Genomics
|May 1, 1993
PubMed
Summary

Researchers identified 17 variants in the collagen type II gene (COL2A1) VNTR region, revealing high heterozygosity. This COL2A1 polymorphism likely evolved through replication slippage mechanisms.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Human Population Genetics

Background:

  • The collagen type II gene (COL2A1) plays a crucial role in skeletal development.
  • Variable number of tandem repeat (VNTR) regions are known genetic markers with high polymorphism.
  • Previous studies identified five alleles in the COL2A1 VNTR region.

Purpose of the Study:

  • To further subtype and characterize the allelic variants of the COL2A1 VNTR region.
  • To investigate the internal organization and evolutionary mechanisms of COL2A1 polymorphism.
  • To determine the heterozygosity and allelic distribution in a Norwegian population.

Main Methods:

  • In vitro amplification of the COL2A1 VNTR region using polymerase chain reaction (PCR).
  • High-resolution gel electrophoresis for allele separation and subtyping.
  • DNA sequencing of COL2A1 alleles to analyze VNTR internal organization.

Main Results:

  • A total of 17 allelic variants were identified, significantly increasing the previously reported number.
  • High heterozygosity of 73.0% was observed in 202 unrelated Norwegians.
  • Polymorphism is primarily attributed to copy number variations of 34 and 31 bp repeat units and small deletions.

Conclusions:

  • The COL2A1 VNTR locus exhibits extensive polymorphism with a structured organization.
  • Replication slippage is proposed as the main evolutionary mechanism driving COL2A1 polymorphism.
  • The findings enhance understanding of genetic variation in the COL2A1 gene and its implications.

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