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Apolipoprotein polymorphisms and phenotypic variability in American Samoans: Preliminary data.

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Human apolipoprotein E and H genetic variations influence body composition and metabolism in Samoans. APO E*2 and E*4 alleles were linked to lower glucose levels, while APO H*1 was linked to higher glucose.

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Area of Science:

  • Human genetics
  • Metabolic research
  • Anthropometry

Background:

  • Human apolipoprotein genetic variation impacts body composition and metabolic phenotypes.
  • Previous studies suggest ethnic variations in apolipoprotein-phenotype associations.

Purpose of the Study:

  • Investigate associations between apolipoprotein E (APO E) and H (APO H) genetic variations and phenotypic traits in American Samoans.
  • Examine relationships with body habitus, plasma glucose, glycated hemoglobin, pulse rate, and blood pressure.

Main Methods:

  • Studied 67 American Samoan residents, documenting structural variation at APO E and APO H loci.
  • Analyzed associations with anthropometric measurements (weight, skinfolds, circumferences, BMI) and metabolic markers (glucose, HbA1c).
  • Performed sex-stratified and combined analyses.

Main Results:

  • APO E*2 allele in men associated with higher weight, trunk fat, and specific skinfolds; APO E*4 associated with lower weight, BMI, and arm measurements.
  • Sex-specific differences observed for APO E associations; minimal body habitus differences noted for APO H alleles in men.
  • APO E*2 and E*4 alleles linked to lower plasma glucose and glycated hemoglobin; APO H*1 linked to higher glucose and HbA1c. APO E*4 associated with lower blood pressure and higher pulse rate.

Conclusions:

  • Apolipoprotein E genetic variation shows significant sex-specific associations with body composition and metabolic traits in Samoan men.
  • Observed associations differ from those in Caucasian, Japanese, and Hispanic populations, highlighting ethnic variability.
  • Findings support the hypothesis that apolipoprotein gene-phenotype associations are population-specific.