Autosomal STR variation in five Austronesian populations

Area of Science:

• Population genetics
• Forensic biology
• Human genetics

Background:

• Human population characteristics at the genetic level are crucial for forensic biology and population genetics.
• Microsatellite markers are valuable tools for analyzing genetic diversity within and between populations.

Purpose of the Study:

• To characterize intra- and interpopulation genetic differences among five Austronesian-speaking groups.
• To evaluate the utility of biparental microsatellite markers for population genetic analysis.
• To assess the genetic distinctiveness of Taiwanese, Indonesian, and Samoan populations.

Main Methods:

• Analysis of 15 short tandem repeat (STR) loci in 338 unrelated individuals from five Pacific island populations.
• Determination and comparison of allele frequencies with global populations.
• Hierarchical AMOVA and phylogenetic analyses (neighbor-joining tree).

Main Results:

• Significant genetic differentiation was observed among the five Austronesian-speaking groups.
• A clear genetic divide exists between Samoan and East/Southeast Asian populations (Taiwan, Indonesia).
• Genetic distinctions were found between Ami and Atayal (Taiwan), and between Java and Bali (Indonesia), despite geographic proximity.

Conclusions:

• Despite linguistic commonalities, the studied Austronesian populations are genetically distinct.
• The observed genetic differentiation supports the creation of population-specific databases for human identification.
• Microsatellite marker analysis effectively highlights fine-scale population structure.