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An evolutionary model for the insect vitellins

D G Harnish, B N White

    Journal of Molecular Evolution
    |January 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Insect vitellogenins and vitellins show evolutionary relationships based on polypeptide size, immunological cross-reactivity, and amino acid composition. These studies reveal rapid evolution and potential domain elimination in insect vitellogenin gene evolution.

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    Area of Science:

    • Biochemistry
    • Evolutionary Biology
    • Entomology

    Background:

    • Insects exhibit three distinct groups of vitellogenins/vitellins based on polypeptide constituent sizes.
    • Understanding the evolutionary relationships between these insect groups is crucial for comparative studies.

    Purpose of the Study:

    • To investigate the relationships between different insect vitellogenin/vitellin groups.
    • To assess the evolutionary divergence and homology of insect vitellins.

    Main Methods:

    • Immunological cross-reactivity assays using antisera against vitellins from seven insect species across six orders.
    • Amino acid compositional analysis and homology assessment using difference matrices (S delta Q and S delta n).

    Main Results:

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    • Immunological relatedness was confined to vitellins within the same insect family.
    • Amino acid composition data (S delta Q) suggested relatedness across intra-order and inter-order comparisons.
    • S delta n comparisons indicated rapid evolution of vitellins, aligning with immunological findings.
    • Most insect vitellins feature two polypeptide sizes from a single proteolytic cleavage, suggesting distinct domains.

    Conclusions:

    • Insect vitellin evolution is characterized by rapid changes and potential domain elimination, particularly in Diptera and Hymenoptera.
    • The findings support a model of vitellogenin gene evolution involving domain loss.