[Efficiency of 27-plex single nucleotide polymorphism multiplex system for ancestry inference in different...

Area of Science:

• Forensic Genetics
• Population Genetics
• Molecular Biology

Background:

• Accurate ancestry inference is crucial for forensic investigations.
• Single nucleotide polymorphisms (SNPs) are valuable genetic markers for determining population origins.
• Multiplex SNP systems offer efficient analysis of multiple genetic markers simultaneously.

Purpose of the Study:

• To validate the efficiency of a 27-plex SNP multiplex system for inferring human ancestry.
• To assess the system's sensitivity, species specificity, and accuracy in differentiating diverse populations.

Main Methods:

• Validated a 27-plex SNP system for sensitivity and species specificity.
• Analyzed genotypes from 533 individuals across various global populations.
• Utilized HapMap database reference populations (CHB, CEU, YRI) for clustering analysis.

Main Results:

• The system demonstrated high sensitivity (0.125 ng) and species specificity, with minimal cross-reactivity in non-human primates.
• Successfully differentiated intercontinental populations with 100% accuracy in blind tests.
• Failed to distinguish between East Asian and Southeast Asian populations, or between Han Chinese and other Chinese ethnic groups.

Conclusions:

• The 27-plex SNP system is effective for broad ancestry inference (African, European, East Asian) in forensic contexts.
• The system lacks the resolution to differentiate within East Asian subpopulations.
• Development of additional, specific ancestry-informative markers is necessary for improved subpopulation discrimination.