Genetics
No correlation between apo(a) isoform size and Lp(a) concentration in 43 acute coronary syndrome patients with Lp(a) above 50 mg/dL (Clin Investig Arterioscler 2026)
Original title: Relationship between apolipoprotein(a) isoforms and lipoprotein(a) levels in patients with acute coronary syndrome
This study characterised apolipoprotein(a) isoforms by Western blotting into 12 molecular weight bands in 43 patients with acute coronary syndrome and Lp(a) above 50 mg/dL, testing whether isoform size explains the discordant phenotypes seen between apo(a) size and circulating Lp(a) level. Intermediate molecular weight bands (b5-b8) were the most frequent, with band 8 predominating, but no significant association was found between isoform band size and Lp(a) concentration (P > .05). The authors conclude that in this ACS cohort, apo(a) isoform size alone does not explain Lp(a) variability, and suggest other genetic or regulatory mechanisms are at play, pending confirmation in larger cohorts.
Original abstract
Lp(a) is a cardiovascular risk factor influenced by the LPA gene and apo(a) isoforms. Their relationship is not always linear and there are discordant phenotypes, for this reason in our work we evaluated the association between apo(a) isoforms and Lp(a) levels in patients with acute coronary syndrome (ACS). To this end, 43 patients with ACS and Lp(a) >50mg/dL were studied. The isoforms were characterized in 12bands by Western blotting. The association between bands and Lp(a) concentrations was evaluated by statistical analysis. It was observed that the intermediate molecular weight bands (b5-b8) were the most frequent, with band 8 predominating. No significant association was found between isoform size and Lp(a) levels (P>.05). We conclude that in this cohort no correlation was observed between apo(a) and Lp(a) isoforms. Other genetic or regulatory mechanisms could explain the observed variability, supporting the need for larger studies.
Summary written by lp-a.org from the published abstract; figures as published. Page updated 17 August 2026. Methods.