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Complement polymorphism in Greece.

C D Triantaphyllidis1, A Ad'hiah, J Karkousis

  • 1Division of Human Genetics, School of Pathological Sciences, University of Newcastle Upon Tyne, UK.

Annals of Human Biology
|September 1, 1989
PubMed
Summary
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Genetic variations in complement components C2, C3, C4, and BF were analyzed in Northern Greeks. A novel C2*A allele, previously unseen in European Caucasoids, was identified, alongside C4 gene duplications.

Area of Science:

  • Immunogenetics
  • Human Genetics
  • Complement System Biology

Background:

  • The complement system is crucial for innate immunity.
  • Polymorphisms in complement genes (C2, C3, C4, BF) can influence immune response.
  • Understanding regional genetic variations is important for population genetics and disease association studies.

Purpose of the Study:

  • To investigate the allele frequencies and polymorphisms of complement components C2, C3, C4, and BF in a Northern Greek population.
  • To identify any rare or novel variants within these complement genes.

Main Methods:

  • Analysis of complement component polymorphisms (C2, C3, C4, BF).
  • Study conducted on 166 unrelated individuals from Northern Greece.
  • Allele frequency calculations and comparison with existing European data.

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Main Results:

  • C3*F and BF*F allele frequencies in Greeks fall within the reported European range.
  • A rare C2C/C2A heterozygote variant was identified in one Greek individual, with the C2*A allele being novel in European Caucasoids.
  • Six different alleles were observed for both C4A and C4B loci.
  • Low frequency of null alleles at C4A locus and a high incidence of gene duplications in the C4 system were noted.

Conclusions:

  • The genetic profile of C3 and BF in Greeks aligns with broader European patterns.
  • The discovery of the C2*A allele in European Caucasoids highlights potential unique genetic contributions within specific populations.
  • The observed C4 gene duplications and null allele frequencies suggest specific evolutionary pressures or population dynamics affecting this complement locus in the studied group.