Plasma Ip(a) Concentration is Inversely Correlated with the Ratio of Kringle IV/Kringle V Encoding Domains in the Apo(a) Gene

Overview

Journal J Clin Invest

Specialty General Medicine

Date 1989 Dec 1

PMID 2556454

Citations 37

Authors

D Gavish

N Azrolan

J L Breslow

Affiliations

Soon will be listed here.

Abstract

Plasma Lp(a) levels correlate with atherosclerosis susceptibility. This lipoprotein consists of an LDL-like particle attached to a large glycoprotein called apo(a). Apo(a) is a complex glycoprotein containing multiple Kringle domains, found to be highly homologous to plasminogen Kringle IV, and a single Kringle domain homologous to plasminogen Kringle V. Lp(a) levels appear to be inversely correlated with apo(a) size in a given individual. In this study, we have used probes specific to the Kringles IV and V domains of apo(a) cDNA in quantitative Southern blotting analysis. By this method, we have determined the ratio of Kringle IV/Kringle V encoding domains in the apo(a) gene of 53 unrelated individuals with different plasma concentrations of Lp(a). This ratio was found to be inversely correlated with log Lp(a) levels (r = -0.90, P less than 0.0001) and directly correlated with apo(a) apparent molecular weight (Mr) (r = 0.79, P less than 0.0001). In summary, by showing that Lp(a) concentrations and apo(a) apparent size are highly correlated with the ratio of Kringle IV/Kringle V encoding domains in the apo(a) gene, we provide a DNA marker for this atherosclerosis risk factor as well as an important insight into the genetic mechanism regulating Lp(a) levels.

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