Lactose absorption in a Western Massim population

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.