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Differences between genotyping and phenotyping methods for assessing apolipoprotein(a) size polymorphisms.

Josep M Simó1, Jordi Camps, Silvia Martín

  • 1Centre de Recerca Biomèdica, Institut de Recerca en Ciències de la Salut, Hospital Universitari de Sant Joan, Reus, Catalunya, Spain.

Clinical Chemistry and Laboratory Medicine
|October 29, 2003
PubMed
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Genotyping and phenotyping methods for apolipoprotein(a) (apo(a)) size show discrepancies, with phenotyping overestimating size. These differences impact plasma lipoprotein(a) (Lp(a)) concentration correlations and require careful consideration in laboratory results.

Area of Science:

  • Biochemistry
  • Genetics
  • Cardiovascular Research

Background:

  • Apolipoprotein(a) (apo(a)) size polymorphisms are linked to cardiovascular disease risk.
  • Accurate measurement of apo(a) size is crucial for assessing lipoprotein(a) (Lp(a)) levels and associated risks.

Purpose of the Study:

  • To compare apo(a) gene genotyping and protein size phenotyping methods.
  • To investigate the relationship between apo(a) size measurements and plasma Lp(a) concentrations.
  • To explore potential reasons for discrepancies between genotyping and phenotyping.

Main Methods:

  • Double-blind analysis of healthy volunteers (n=99) and premature myocardial infarction patients (n=91).
  • Genotyping of apo(a) using pulse-field electrophoresis.
  • Phenotyping of apo(a) using sodium dodecyl sulfate-agarose gel electrophoresis.

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Main Results:

  • Phenotyping significantly overestimated apo(a) size compared to genotyping (mean difference: 3.7 kringle units; p < 0.001).
  • Both methods showed high correlation (r=0.83; p < 0.001), but single-band phenotypes aligned more with smaller alleles.
  • Plasma Lp(a) concentration correlated more strongly with phenotype than genotype.

Conclusions:

  • Significant dissimilarities exist between apo(a) phenotyping and genotyping methods.
  • Post-translational modifications are hypothesized as a cause for observed discrepancies.
  • Laboratories must carefully consider these methodological differences when interpreting and transferring apo(a) size results.