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A method for subtyping group-specific component in bloodstains.

B Budowle

    Forensic Science International
    |March 1, 1987
    PubMed
    Summary
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    This study introduces a new method for subtyping group-specific component (Gc) in aged bloodstains using isoelectric focusing. The technique successfully identified Gc phenotypes in four-month-old bloodstains, proving reliable for forensic analysis.

    Area of Science:

    • Forensic Science
    • Biochemistry
    • Genetics

    Background:

    • Group-specific component (Gc) is a polymorphic protein found in human blood.
    • Accurate Gc subtyping from aged bloodstains is crucial for forensic investigations.
    • Existing methods may have limitations in sensitivity or applicability to degraded samples.

    Purpose of the Study:

    • To develop and validate a novel method for Gc subtyping from human bloodstains.
    • To assess the efficacy of the method on aged bloodstains.
    • To compare the new method with conventional techniques for Gc typing.

    Main Methods:

    • Extraction of Gc from bloodstained cuttings using 6 M urea.
    • Isoelectric focusing in ultrathin-layer polyacrylamide gels (pH 4.5-5.4).

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  • Detection of Gc by immunofixation on cellulose acetate membranes.

    • Main Results:

    • Successful Gc subtyping in bloodstains up to four months old at room temperature.
    • No discrepancies observed when comparing the new method with conventional agarose gel electrophoresis using 266 liquid blood samples.
    • Gc population data for White individuals in Baltimore were homogeneous with other US populations.
    • Gc data for Northern US Black populations showed heterogeneity compared to Southern US Black populations.

    Conclusions:

    • The described method provides a reliable approach for Gc subtyping from aged human bloodstains.
    • This technique offers a valuable tool for forensic casework, particularly with limited or degraded samples.
    • Population data suggest potential regional variations in Gc phenotypes within the Black population in the USA.