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Lactose absorption in a Western Massim population

S F Gibney, V Munroe, G T Nurse

    Annals of Human Biology
    |September 1, 1981
    PubMed
    Summary

    Lactose absorption in Austronesian-speaking adults on Goodenough Island mirrored mainland Papua New Guinea findings. The unexpected presence of this trait suggests founder effect or selection may be responsible.

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    Area of Science:

    • Human genetics and anthropology
    • Population studies of lactose absorption
    • Austronesian migration and adaptation

    Background:

    • Lactose absorption (lactase persistence) is a key human adaptation.
    • Its prevalence varies significantly across global populations.
    • Previous studies have investigated lactose absorption in Papua New Guinea.

    Purpose of the Study:

    • To investigate lactose absorption in the first Austronesian-speaking population sample.
    • To compare these findings with non-Austronesian-speaking populations in Papua New Guinea.
    • To explore potential evolutionary mechanisms (founder effect or selection) for lactose absorption polymorphism.

    Main Methods:

    • Lactose absorption testing was performed on adult individuals from Goodenough Island.
    • Data were compared with existing lactose absorption data from mainland Papua New Guinea.

    Main Results:

    • Lactose absorption patterns in the Goodenough Island sample were similar to mainland Papua New Guinea.
    • This similarity was observed despite the Austronesian-speaking group's lack of a history of milk utilization.

    Conclusions:

    • The presence of lactose absorption polymorphism in this Austronesian-speaking population is unexpected.
    • Further research is needed to determine if founder effect or natural selection is the driving force.
    • Recent founder effect is a plausible explanation, given common ancestry with previous study groups.

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