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Mitochondrial DNA size variation within individual crickets.

R G Harrison, D M Rand, W C Wheeler

    Science (New York, N.Y.)
    |June 21, 1985
    PubMed
    Summary
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    Cricket mitochondrial DNA exhibits size variation and heteroplasmy in some individuals. This variation offers a genetic marker, suggesting slow segregation of mitochondrial DNA in cricket germ cells.

    Area of Science:

    • * Molecular Biology
    • * Genetics
    • * Evolutionary Biology

    Background:

    • * Mitochondrial DNA (mtDNA) is crucial for cellular energy production and is maternally inherited in many species.
    • * Studying mtDNA variation can reveal insights into population genetics, evolutionary history, and inheritance patterns.
    • * Size polymorphism in mtDNA has been observed in various organisms, but its implications for inheritance are not always clear.

    Purpose of the Study:

    • * To investigate the presence and nature of mitochondrial DNA size polymorphism in two closely related cricket species (genus Gryllus).
    • * To determine the frequency of heteroplasmy (co-occurrence of different mtDNA variants) within individuals.
    • * To assess the utility of intraindividual mtDNA variation as a marker for studying mitochondrial DNA transmission genetics.

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    Main Methods:

    • * Restriction fragment analysis was employed to examine the mitochondrial DNA of field-collected crickets.
    • * Analysis focused on identifying size variations and restriction site variations within the mtDNA.
    • * Patterns of variation were compared between mothers and offspring to infer transmission dynamics.

    Main Results:

    • * Mitochondrial DNA size polymorphism was confirmed in the studied cricket species.
    • * A significant proportion (12%) of the sampled crickets exhibited heteroplasmy for mtDNA size variants.
    • * No heteroplasmy was detected for restriction site variations, indicating size is the primary source of intraindividual variation.

    Conclusions:

    • * Intraindividual variation in cricket mitochondrial DNA, particularly size polymorphism, serves as a valuable marker for genetic studies.
    • * The observed patterns of variation in mother-offspring pairs suggest that mitochondrial DNA variants do not segregate randomly or rapidly within cricket germ-cell lineages.
    • * These findings contribute to understanding the complex inheritance mechanisms of mitochondrial DNA in insects.