Inferring population structure and demographic history using Y-STR data from worldwide populations

Area of Science:

• Human Population Genetics
• Evolutionary Biology
• Forensic Genetics

Background:

• The Y chromosome is crucial for tracing human evolutionary history.
• Previous Y-chromosome short tandem repeat (STR) studies had limited geographical scope or sample sizes.
• Understanding global population structure requires comprehensive Y-STR data.

Purpose of the Study:

• To investigate global human population structure and demographic history.
• To analyze Y-STR data from a large, diverse worldwide sample.
• To provide a detailed view of human male demographic history.

Main Methods:

• Utilized 17 Y-chromosomal STR markers.
• Analyzed data from 979 males across 44 worldwide populations.
• Calculated genetic distances, diversities, and time to most recent common ancestors (TMRCAs).

Main Results:

• Largest genetic distances observed between African and non-African populations.
• African populations exhibit oldest TMRCAs, largest effective sizes, and earliest expansions.
• American, Siberian, Melanesian, and Atayal populations show recent TMRCAs and smaller effective sizes, aligning with the serial founder model.

Conclusions:

• The study provides the most detailed global Y-STR dataset to date.
• Findings support the serial founder model for human migration out of Africa.
• The dataset is valuable for forensic applications and future population genetic studies.