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Updated: Jun 4, 2026

A Noninvasive Hair Sampling Technique to Obtain High Quality DNA from Elusive Small Mammals
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An RNA expression method for aging forensic hair samples.

Clint Hampson1, Jari Louhelainen, Suzzanne McColl

  • 1Department of Pharmacy and Biomolecular Science, Liverpool John Moores University, Max Perutz Building, Byrom Street, Liverpool, UK, L3 3AF. c.hampson@ljmu.ac.uk

Journal of Forensic Sciences
|February 2, 2011
PubMed
Summary
This summary is machine-generated.

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Forensic scientists can estimate hair deposition time using RNA analysis. This method, using reverse transcription quantitative polymerase chain reaction (RT-qPCR), is reliable for up to 60 days.

Area of Science:

  • Forensic Science
  • Molecular Biology
  • Genetics

Background:

  • Determining the deposition time of forensic trace evidence is crucial for crime investigation.
  • Current methods for estimating evidence age are limited, impacting suspect exclusion and timeline reconstruction.

Purpose of the Study:

  • To develop and validate a method for estimating the deposition time of hair samples using RNA analysis.
  • To assess the reliability of RNA expression ratios in aged hair samples.

Main Methods:

  • Utilized a reverse transcription quantitative polymerase chain reaction (RT-qPCR) assay.
  • Monitored the relative expression ratio (RER) of 18S and β-actin RNA species in naturally aged hair samples over 3 months.
  • Analyzed data for age-of-donor or gender biases and linearity of results.

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Main Results:

  • No significant gender or age-of-donor biases were observed in RNA expression.
  • Results showed a linear correlation up to 60 days, with increasing variability thereafter.
  • Developed a second-order polynomial equation (Age = 3.31RER(2) - 2.85RER - 0.54) for approximating hair sample age, with R(2) = 0.98.

Conclusions:

  • RNA analysis via RT-qPCR offers a viable method for approximating the deposition time of hair evidence with follicular tags.
  • The method is most reliable for hair samples aged up to 60 days.
  • Further research may be needed to improve accuracy for samples older than 60 days.