title: Biological identifications through DNA barcodes.
abstract: Although much biological research depends upon species diagnoses, taxonomic expertise is collapsing. We are convinced that the sole prospect for a sustainable identification capability lies in the construction of systems that employ DNA sequences as taxon 'barcodes'. We establish that the mitochondrial gene cytochrome c oxidase I (COI) can serve as the core of a global bioidentification system for animals. First, we demonstrate that COI profiles, derived from the low-density sampling of higher taxonomic categories, ordinarily assign newly analysed taxa to the appropriate phylum or order. Second, we demonstrate that species-level assignments can be obtained by creating comprehensive COI profiles. A model COI profile, based upon the analysis of a single individual from each of 200 closely allied species of lepidopterans, was 100% successful in correctly identifying subsequent specimens. When fully developed, a COI identification system will provide a reliable, cost-effective and accessible solution to the current problem of species identification. Its assembly will also generate important new insights into the diversification of life and the rules of molecular evolution.
authors.affiliation: Department of Zoology, University of Guelph, Guelph, Ontario N1G 2W1, Canada. phebert@uoguelph.ca
authors.forename: Paul D N
authors.initials: PD
authors.lastname: Hebert
authors.forename: Alina
authors.initials: A
authors.lastname: Cywinska
authors.forename: Shelley L
authors.initials: SL
authors.lastname: Ball
authors.forename: Jeremy R
authors.initials: JR
authors.lastname: deWaard
mesh_terms: D000818:Animals; D004272:DNA, Mitochondrial / Q000737:chemistry / Q000235:genetics*; D003576:Electron Transport Complex IV / Q000737:chemistry / Q000235:genetics*; D019143:Evolution, Molecular; D014644:Genetic Variation; D007915:Lepidoptera / Q000145:classification / Q000235:genetics; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA
chemical_list: D004272:DNA, Mitochondrial; D003576:Electron Transport Complex IV