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DNA typing from cigarette butts.

Yoshihisa Watanabe1, Tomohiro Takayama, Keiji Hirata

  • 1Criminal Investigation Laboratory, Gifu Prefectural Police Headquarters, 2-1-1 Yabuta-minami, Gifu 500-8501, Japan. watayosh@sannet.ne.jp

Legal Medicine (Tokyo, Japan)
|August 26, 2003
PubMed
Summary

DNA typing from cigarette butts is feasible but challenging. Inhibitory compounds in cigarette ends, particularly dyes, can degrade DNA and inhibit PCR, affecting forensic analysis.

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Area of Science:

  • Forensic Science
  • Molecular Biology
  • Genetics

Background:

  • Cigarette butts are a potential source of DNA for forensic identification.
  • Previous studies have shown variable success rates in DNA extraction and typing from cigarette butts.

Purpose of the Study:

  • To evaluate the reliability of DNA typing from cigarette butts using multiple genetic markers.
  • To identify factors affecting DNA typing success from cigarette butts.

Main Methods:

  • DNA typing was performed on 100 cigarette butts from ten individuals using D1S80, HLADQA1, TH01, and PM loci.
  • Agarose gel electrophoresis was used to assess DNA quality.
  • PCR inhibition was investigated using DNA extracts from unsmoked cigarettes and purification methods.

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Main Results:

  • Successful DNA typing from cigarette butts varied by locus, with D1S80 showing 76% agreement and TH01, HLADQA1, PM showing 90% agreement with bloodstain results.
  • Sixteen samples showed DNA degradation (loss of longer alleles), and ten samples failed PCR amplification.
  • PCR inhibition was observed with Marlboro cigarette extracts, linked to yellow dyes, but could be mitigated by DNA purification.

Conclusions:

  • DNA typing from cigarette butts is possible but requires careful consideration of DNA degradation and PCR inhibition.
  • Specific cigarette brands and dyes can interfere with DNA analysis, necessitating purification steps.
  • Forensic scientists must be aware of these challenges when analyzing cigarette butt evidence.