Evaluating mtDNA patterns of genetic isolation using a re-sampling procedure: A case study on Italian populations

Area of Science:

• Population Genetics
• Human Evolution
• Molecular Anthropology

Background:

• Traditional genetic analyses of human populations often struggle to distinguish long-term isolation from sample size effects.
• Mitochondrial DNA (mtDNA) polymorphisms are frequently used to study population genetic patterns.

Purpose of the Study:

• To develop a method for detecting genetic isolation that is independent of sample size.
• To identify human populations exhibiting signatures of genetic isolation.

Main Methods:

• A re-sampling procedure was applied to 34 Italian populations.
• Evaluated reduction in intra-population diversity, genetic background departure, and demographic stationarity.
• Utilized mitochondrial DNA (mtDNA) polymorphisms as a genetic marker.

Main Results:

• Seven Italian populations showed clear signatures of genetic isolation across multiple genetic statistics.
• Nineteen populations did not exhibit significant signals of isolation based on the analyzed statistics.
• Eight additional populations displayed partial signals of isolation for one or two statistics.

Conclusions:

• The combination of population genetic statistics and re-sampling effectively detects genetic isolation.
• This approach enhances the reliability of genetic isolation studies, even with limited genetic markers like mtDNA.
• The findings contribute to understanding human population structure and evolutionary history.