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DNA barcoding as a diagnostic tool for quarantine fruit flies: problems and solutions
DNA bacoding is a popular DNA diagnostic technique especially for specific and generic level identification during various quarantine activities. BOLD Systems, an internet accessible DNA barcode data portal, currently includes over 12,000 DNA barcodes for the fruit fly family Tephritidae, of which 8,940 barcodes are open to public. These data represent 655 tephritid species, majority of which are pest species. These figures are rapidly increasing as the tephritid barcoding research is increasing every year. Therefore, BOLD has established as the most important DNA barcode source for tephritid identification. It is, therefore, also important to understand the limitations and problems of the DNA barcoding analysis. We here discussed the following potential problems and their possible solutions: (1) misidentification of species listed in BOLD; (2) sibling species with identical or near-identical barcodes; (3) NUMT (nuclear mitochondrial DNA) or pseudogene; and (4) introgression by hybridization between closely related species.
