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[Construction of a microfluidic chip-based 72 plex single nucleotide polymorphisms ancestry inference system].

Ping Ren1,2,3, Jing Liu2, Risheng Lin4

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A new autosomal single nucleotide polymorphism (SNP) microfluidic chip system accurately identifies genetic ancestry. This system uses competitive allele-specific PCR for reliable SNP typing and ancestry inference in diverse populations.

Keywords:
ancestry inferencemicrofluidic chipsingle nucleotide polymorphism complex system

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Area of Science:

  • Forensic Genetics
  • Human Population Genetics
  • Biotechnology

Background:

  • Accurate inference of human ancestry is crucial for population genetics and forensic applications.
  • Existing methods for ancestry determination often require large sample sizes or complex analyses.
  • Development of efficient and accurate SNP typing systems is needed for large-scale genetic studies.

Purpose of the Study:

  • To develop an autosomal single nucleotide polymorphism (SNP) multiplex detection chip system for inferring the ancestry of unknown individuals.
  • To construct a microfluidic chip-based system utilizing competitive allele-specific polymerase chain reaction (PCR) for SNP amplification and detection.
  • To validate the accuracy and reliability of the developed SNP typing system for ancestry inference.

Main Methods:

  • Design and construction of a microfluidic chip with 112 wells, each containing allele-specific primers for 72 ancestry-informative SNPs (AISNPs).
  • Implementation of a multiplex PCR assay on the microfluidic chip, followed by fluorescence detection using a confocal laser scanning instrument for SNP genotyping.
  • Validation of the system using 52 samples for SNP typing accuracy and subsequent ancestry inference of 20 unknown samples against a reference database of 3628 individuals from 57 populations.

Main Results:

  • The developed autosomal 72-SNP microfluidic chip system demonstrated 100% accuracy in SNP typing for 52 tested samples.
  • Ancestry inference for 20 individuals using the reference database showed results consistent with their known origins.
  • The system successfully established a reliable method for high-throughput SNP detection and ancestry determination.

Conclusions:

  • The established autosomal 72-SNP microfluidic chip system provides an accurate and efficient tool for SNP detection.
  • The system enables reliable inference of individual ancestry by comparing genotypes against a comprehensive reference database.
  • This technology holds significant potential for applications in population genetics, forensics, and personalized medicine.