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Ethnic differences in the frequency of the cardioprotective C679X PCSK9 mutation in a West African population

Francine Sirois1, Elias Gbeha, Ambaliou Sanni

  • 1Chronic Disease Program, Ottawa Health Research Institute, Ottawa Hospital, University of Ottawa, Ottawa, Canada.

Genetic Testing
|July 26, 2008
PubMed

Insights

The cardioprotective C679X mutation in the PCSK9 gene, linked to lower cholesterol and heart disease risk, is common in West Africa. Its varying frequency across ethnic groups may influence coronary heart disease incidence.

Area of Science:

  • Genetics
  • Cardiology
  • Population Health

Background:

  • Proprotein convertase subtilisin/kexin type 9 (PCSK9) regulates plasma cholesterol by affecting low-density lipoprotein receptor degradation.
  • Specific PCSK9 gene mutations, Y142X and C679X, are associated with lifelong hypocholesterolemia and reduced coronary heart disease (CHD) risk in African Americans.

Purpose of the Study:

  • To investigate the frequency of the cardioprotective PCSK9 Y142X and C679X mutations in West African populations.
  • To explore potential associations between mutation frequency and coronary heart disease incidence in the region.

Main Methods:

  • Genotyping of 520 individuals from Burkina-Faso, Benin, and Togo for PCSK9 mutations.
  • Analysis of mutation frequencies and heterozygosity rates across different ethnic groups.

Main Results:

  • The C679X mutation was detected in West African subjects, with an overall heterozygosity frequency of 3.3%.
  • The Y142X mutation was not detected.
  • Significant interethnic variations in C679X frequency were observed, ranging from 0% to 6.9%.

Conclusions:

  • The C679X mutation is prevalent in West Africa and may contribute to the lower incidence of coronary heart disease in the continent.
  • Observed frequency differences suggest potential roles of historical migration patterns and positive selection in shaping mutation distribution.

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