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Related Concept Videos

DNA Microarrays02:34

DNA Microarrays

Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...

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Enhanced Genetic Analysis of Single Human Bioparticles Recovered by Simplified Micromanipulation from Forensic &#8216;Touch DNA&#8217; Evidence
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Evaluation of the 124-plex SNP typing microarray for forensic testing.

Kaarel Krjutskov1, Triin Viltrop, Priit Palta

  • 1Department of Biotechnology, IMCB, University of Tartu, 23 Riia St, 51010 Tartu, Estonia. karlakrj@ut.ee

Forensic Science International. Genetics
|December 2, 2009
PubMed
Summary

A new 124-plex assay enables simultaneous genotyping of autosomal, mitochondrial, and Y chromosome DNA markers. This cost-effective method enhances human identification, forensic DNA testing, and genetic genealogy applications with high accuracy.

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Area of Science:

  • Forensic genetics
  • Human identification
  • Molecular biology

Background:

  • Reliable and cost-effective genotyping of autosomal, mitochondrial, and Y chromosome markers is crucial for human identification systems.
  • Existing assays often lack the capability to simultaneously detect all three DNA targets in a single reaction.
  • Venous blood and saliva are common biological materials used in these analyses.

Purpose of the Study:

  • To characterize a novel 124-plex assay for simultaneous genotyping of autosomal, mitochondrial, and Y chromosome SNPs.
  • To evaluate the accuracy and efficiency of this multiplex assay for forensic and genealogical applications.
  • To enable simultaneous detection of single nucleotide polymorphisms (SNPs) from different genomic regions in one reaction.

Main Methods:

  • Utilized the APEX-2 principle involving primer extension, universal primer amplification, and single base extension on an oligonucleotide array.
  • Designed a 124-plex assay including 46 autosomal, 29 Y chromosomal, and 49 mitochondrial DNA SNPs.
  • Validated the assay on 17 families, internal controls, and 79 unrelated individuals from Estonia and Sweden.

Main Results:

  • Achieved high accuracy (99.83%) and call rate (99.66%) for the multiplex assay.
  • Demonstrated the assay's capability for simultaneous genotyping of SNPs from single-copy loci and multi-copy mitochondrial DNA.
  • Successfully inferred mitochondrial DNA and Y chromosome haplogroups, comparable to conventional methods.

Conclusions:

  • The novel 124-plex assay provides a reliable and cost-effective solution for simultaneous genotyping of diverse human DNA markers.
  • This assay significantly advances human identification, forensic DNA analysis, and genetic genealogy by integrating autosomal, mitochondrial, and Y chromosome analyses.
  • The method offers high accuracy and efficiency, making it suitable for various biological samples and population studies.