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Area of Science:

  • Forensic genetics
  • Molecular biology
  • Genomic analysis

Background:

  • Short tandem repeat (STR) markers are crucial for forensic individualization and kinship verification.
  • Traditional length-based capillary electrophoresis (CE) is transitioning to sequence-level analysis via massively parallel sequencing (MPS).
  • MPS offers enhanced discriminatory power through detection of internal sequence variants and flanking polymorphisms.

Purpose of the Study:

  • To review the molecular mechanisms of STR variability.
  • To critically evaluate the shift from CE to MPS in forensic genetics.
  • To address analytical challenges and discuss applications in forensic casework.

Main Methods:

  • Literature review synthesizing molecular mechanisms of STR variability.
  • Critical evaluation of sequencing-based STR analysis.
  • Discussion of analytical challenges and forensic applications.

Main Results:

  • MPS significantly increases the discriminatory power of STR analysis.
  • Challenges include stochastic effects with low-template DNA and PCR inhibition in degraded samples.
  • Hierarchical strategies, including mini-STR and MPS, aid in identifying fragmented DNA from mass graves and historical contexts.

Conclusions:

  • MPS represents a significant advancement in forensic STR analysis, offering high-resolution capabilities.
  • Probabilistic genotyping (PG) evolution emphasizes algorithmic transparency and reproducibility for judicial use.
  • Implementing high-resolution STR analysis requires integrating technological advances with practical forensic challenges and considering regional infrastructures.