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Detecting Somatic Genetic Alterations in Tumor Specimens by Exon Capture and Massively Parallel Sequencing
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Paternity testing using massively parallel sequencing and the PowerSeq™ AUTO/Y system for short tandem repeat

Deborah S B S Silva1, Fernanda R Sawitzki2, Melissa K R Scheible1

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Massively parallel sequencing (MPS) enhances paternity testing by providing more genetic data. This advanced DNA analysis improves statistical accuracy and resolves complex familial relationships in forensic casework.

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Area of Science:

  • Forensic Genetics
  • Molecular Biology
  • Population Genetics

Background:

  • Massively parallel sequencing (MPS) is an emerging technology for forensic applications.
  • Short tandem repeat (STR) analysis is crucial for paternity testing and forensic casework.
  • Traditional capillary electrophoresis (CE) methods have limitations in resolving complex genetic data.

Purpose of the Study:

  • To evaluate the application of MPS for STR sequencing in paternity testing.
  • To assess the inheritance patterns of STR sequence alleles in families.
  • To compare the statistical power of sequence-based versus length-based STR analysis.

Main Methods:

  • Utilized the PowerSeq™ AUTO/Y MPS system for STR sequencing.
  • Analyzed 29 mother-child-father trios from Southern Brazil.
  • Examined STR sequence allele inheritance, including core repeat and flanking regions.

Main Results:

  • Paternity index values generally increased with sequence-based MPS data compared to length-based data.
  • MPS resolved allele inconsistencies, such as single repeat mutation events, by analyzing sequence information.
  • Identified isoalleles, enabling precise determination of paternal and maternal inheritances.

Conclusions:

  • Sequence-based analysis using MPS offers significant advantages for paternity testing.
  • MPS improves statistical calculations and provides higher resolution for family trio analyses.
  • Implementation of MPS enhances the accuracy and power of genetic testing in forensic casework.