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Apolipoproteins(a): a puzzling evolutionary story

R Lawn, L Patthy, G Pesole

    Journal of Molecular Evolution
    |February 1, 1997
    PubMed
    Summary

    Human apolipoprotein(a), a heart disease risk factor, evolved from plasminogen gene duplication before mammals radiated. Its protease domain is likely nonfunctional.

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    Area of Science:

    • Evolutionary biology
    • Molecular genetics
    • Cardiovascular disease research

    Background:

    • Human apolipoprotein(a) (apo(a)) shares high sequence identity with plasminogen, a key protein in blood clot breakdown.
    • Plasminogen features five kringle domains and a protease subunit, while human apo(a) has variable kringle 4 copies, a kringle 5 copy, and a protease-like domain.
    • The discovery of a hedgehog apo(a) variant lacking a protease domain prompted an evolutionary investigation.

    Discussion:

    • The structural similarities suggest a common evolutionary origin between apo(a) and plasminogen.
    • The nonfunctionality of the human apo(a) protease domain is supported by comparative evolutionary analysis.
    • The apo(a) gene likely arose from a plasminogen gene duplication event predating mammalian radiation.

    Key Insights:

    • Apolipoprotein(a) and plasminogen share a common ancestor, with apo(a) originating from plasminogen gene duplication.
    • The human apolipoprotein(a) protease domain is evolutionarily nonfunctional.
    • Gene duplication events prior to mammalian radiation are critical for understanding the evolution of complex proteins like apo(a).

    Outlook:

    • Further research into the functional implications of apo(a) kringle domains in cardiovascular disease.
    • Comparative genomic studies across a wider range of mammals to refine the timeline of apo(a) gene evolution.
    • Investigating the selective pressures that led to the retention of apo(a) despite its nonfunctional protease domain.

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