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[Reproducibility of aDNA typing]

W M Schmerer1, S Hummel, B Herrmann

  • 1Institut für Anthropologie, Universität Göttingen.

Anthropologischer Anzeiger; Bericht Uber Die Biologisch-Anthropologische Literatur
|June 1, 1997
PubMed
Summary

To improve short tandem repeat (STR) genotyping accuracy from ancient DNA (aDNA), multiple polymerase chain reaction (PCR) amplifications are crucial. Repeating PCR amplifications minimizes allelic dropout, preventing false homozygote calls in aDNA analysis.

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Area of Science:

  • Forensic Science
  • Molecular Biology
  • Ancient DNA (aDNA) Analysis

Context:

  • Ancient DNA (aDNA) extraction and analysis present unique challenges.
  • Short tandem repeat (STR) amplification is prone to artifacts like allelic dropout.
  • Allelic dropout can lead to inaccurate sample genotyping, specifically false homozygote identification.

Purpose:

  • To assess the reproducibility of STR amplification from aDNA extracts.
  • To investigate the impact of allelic dropout on aDNA genotyping.
  • To determine the effectiveness of multiple amplifications in mitigating genotyping errors.

Summary:

  • Thirty tooth and bone samples from 17 individuals across three burial sites were analyzed in a blind test.
  • Two independent STR loci, HUMVWA and HUMTH01, were amplified using polymerase chain reaction (PCR).
  • Multiple amplifications were performed for each sample and gene locus, as per mathematical estimation, and results were compared intraindividually.

Impact:

  • Repeated amplifications significantly enhance the reliability of STR genotyping from challenging aDNA samples.
  • This method reduces the incidence of false homozygote calls caused by allelic dropout.
  • The findings provide a strategy to improve the accuracy and reproducibility of aDNA analysis in forensic and anthropological studies.

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