DNA typing in wildlife crime: recent developments in species identification

Shanan Tobe, A.M.T. Linacre

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Species identification has become a tool in the investigation of acts of alleged wildlife crimes. This review details the steps required in DNA testing in wildlife crime investigations and highlights recent developments where not only can individual species be identified within a mixture of species but multiple species can be identified simultaneously. ‘What species is this?’ is a question asked
frequently in wildlife crime investigations. Depending on the material being examined, DNA analysis may offer the best opportunity to answer this question. Species testing requires the comparison of the DNA type from the unknown sample to DNA types on a database. The areas of DNA tested are on the mitochondria and include predominantly the cytochrome b gene and the cytochrome oxidase I gene. Standard analysis requires the sequencing of part of
one of these genes and comparing the sequence to that held on a repository of DNA sequences such as the GenBank database. Much of the DNA sequence of either of these two genes is conserved with only parts being variable. A recent
development is to target areas of those sequences that are specific to a species; this can increase the sensitivity of the test with no loss of specificity. The benefit of targeting species specific sequences is that within a mixture of two of
more species, the individual species within the mixture can be identified. This identification would not be possible using standard sequencing. These new developments can lead to a greater number of samples being tested in alleged
wildlife crimes.
Original languageEnglish
Pages (from-to)195-206
Number of pages12
JournalForensic Science, Medicine and Pathology
Volume6
Issue number3
DOIs
Publication statusPublished - 2010

Keywords

  • species identification
  • non-human DNA
  • cytochrome b
  • DNA mixtures

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