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C4 null alleles in a Swedish population

S Nityanand1, R L Dawkins, H Lithell

  • 1Department of Medicine, Karolinska Hospital, Stockholm, Sweden.

European Journal of Immunogenetics : Official Journal of the British Society for Histocompatibility and Immunogenetics
|December 1, 1995
PubMed
Summary

The study found higher frequencies of C4 null alleles (C4Q0) in Swedish males compared to other Caucasian populations. This genetic difference in complement component 4 may influence disease patterns in Sweden.

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Area of Science:

  • Immunogenetics
  • Population Genetics
  • Human Genetics

Background:

  • The complement system, particularly complement component 4 (C4), plays a crucial role in immune responses.
  • C4 null alleles (C4Q0) represent a genetic variation that can affect immune function and susceptibility to diseases.
  • Previous studies have reported varying prevalences of C4Q0 alleles in different ethnic groups, but data for Swedish populations are limited.

Purpose of the Study:

  • To investigate the distribution and prevalence of C4 null alleles (C4Q0) in a Swedish male population.
  • To compare the observed frequencies of C4Q0 alleles in Sweden with those reported in other Caucasian populations.
  • To explore the potential implications of these genetic findings for the disease spectrum in the Swedish population.

Main Methods:

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  • Analysis of serum samples from 410 male individuals residing in Stockholm County and Uppsala City.
  • Determination of the gene products of complement component 4 (C4) to identify homozygous C4A*Q0 and C4B*Q0 alleles.
  • Statistical analysis to calculate allele frequencies and compare them with existing population data.

Main Results:

  • The prevalence of homozygous C4A*Q0 was 5.0% in Stockholm and 4.0% in Uppsala.
  • The prevalence of homozygous C4B*Q0 was 5.6% in Stockholm and 4.0% in Uppsala.
  • These frequencies are notably higher than those previously documented in other Caucasian populations.

Conclusions:

  • The Swedish male population exhibits a distinct genetic profile regarding C4 null alleles compared to other Caucasian groups.
  • The elevated prevalence of C4Q0 alleles in Sweden may contribute to differences in disease susceptibility and manifestation.
  • Further research is warranted to elucidate the specific impact of these genetic variations on health outcomes in the Swedish population.