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Molecular evolution of the calmodulin gene.

H Nojima

    FEBS Letters
    |June 15, 1987
    PubMed
    Summary

    A novel model proposes calmodulin gene evolution through three-fold duplication of a primordial 51-base pair gene. This explains the structure of modern calmodulin and the placement of splice junctions in its DNA.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Evolutionary Biology

    Background:

    • Calmodulin is a crucial calcium-binding protein involved in numerous cellular processes.
    • The structure of calmodulin genes, particularly splice junction locations, has presented evolutionary puzzles.

    Purpose of the Study:

    • To propose a novel model for the evolutionary genesis of the calmodulin gene.
    • To explain the observed intron/exon organization and DNA sequence homology within calmodulin genes.

    Main Methods:

    • Analysis of intron/exon organization in calmodulin genes.
    • Examination of intramolecular homology of DNA sequences within calmodulin genes.

    Main Results:

    • A primordial calmodulin gene of 51 base pairs (encoding 17 amino acids) is proposed.
    • This primordial gene underwent three-fold duplication to form the modern calmodulin gene.
    • The proposed model accounts for the four calcium-binding subdomains in modern calmodulin.

    Conclusions:

    • The three-fold duplication model provides a parsimonious explanation for calmodulin gene evolution.
    • This model elucidates the origins of splice junction positions in calmodulin genes.
    • The study offers insights into the structural and functional evolution of calmodulin.

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