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Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
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High sensitivity multiplex short tandem repeat loci analyses with massively parallel sequencing.

Xiangpei Zeng1, Jonathan L King1, Monika Stoljarova1

  • 1Institute of Applied Genetics, Department of Molecular and Medical Genetics, University of North Texas Health Science Center, 3500 Camp Bowie Blvd., Fort Worth, TX 76107, USA.

Forensic Science International. Genetics
|December 22, 2014
PubMed
Summary
This summary is machine-generated.

Massively parallel sequencing (MPS) offers a powerful alternative to capillary electrophoresis (CE) for forensic genetics. This study demonstrates MPS

Keywords:
Illumina MiSeqMassively parallel sequencing (MPS)Short tandem repeat (STR)

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Area of Science:

  • Forensic Genetics
  • Molecular Biology
  • Genomics

Background:

  • Traditional capillary electrophoresis (CE) for short tandem repeat (STR) typing has limitations including a restricted number of loci and susceptibility to artifacts.
  • Massively parallel sequencing (MPS) has emerged as a high-throughput, cost-effective technology with the potential to overcome CE-based limitations.

Purpose of the Study:

  • To evaluate a prototype multiplex STR system using MPS for forensic applications.
  • To determine optimal sample preparation and sensitivity parameters for reliable STR profiling with MPS.

Main Methods:

  • A prototype multiplex STR system was amplified and prepared using Illumina's TruSeq DNA LT Sample Preparation Kit.
  • Various purification methods, library input amounts, and PCR input DNA quantities were tested.
  • Reliability was assessed by analyzing 24 individuals to evaluate depth of coverage (DoC) and allele coverage ratios (ACRs).

Main Results:

  • The MinElute PCR Purification Kit proved superior to diluted bead mixtures for size selection.
  • A wide range of amplicon product (6-200ng) was suitable for library preparation.
  • Complete or nearly complete STR profiles were achievable with as little as 62pg of input DNA, with optimal results at 250pg.

Conclusions:

  • The evaluated STR multiplex system combined with the Illumina MiSeq platform provides reliable STR profiling.
  • MPS demonstrates a sensitivity level competitive with current capillary electrophoresis methods in forensic genetics.
  • This approach overcomes several limitations inherent in traditional CE-based STR typing.