Studies on the structure and function of the apolipoprotein(a) gene

Area of Science:

• Biochemistry
• Genetics
• Cardiovascular Science

Background:

• Lipoprotein(a) (Lp(a)) is an LDL-like particle and a significant inherited risk factor for atherosclerosis.
• Lp(a) differs from LDL by the presence of apolipoprotein(a).
• The apolipoprotein(a) gene structure is homologous to plasminogen, suggesting potential interference with plasminogen activity in Lp(a) pathophysiology.

Purpose of the Study:

• To investigate the genetic basis and expression of apolipoprotein(a).
• To understand the role of Lp(a) in the development of atherosclerosis.

Main Methods:

• Identification and characterization of apolipoprotein(a) gene family members.
• Analysis of gene proximity using overlapping genomic clones.
• Investigation of apolipoprotein(a) gene expression regulation.
• Generation of transgenic mice with the human apolipoprotein(a) gene.

Main Results:

• Six highly related apolipoprotein(a) genes were identified, with four located closely together.
• Transgenic mice expressing the human apolipoprotein(a) gene developed arterial lesions.

Conclusions:

• The genetic and molecular basis of Lp(a) provides insights into its role as an atherosclerosis risk factor.
• Transgenic mouse models demonstrate the causal link between apolipoprotein(a) and arterial lesion formation.