Abstract
Precise species identification of every insect sample collected from criminal scenes play an essential role in the accurate estimation of postmortem interval. The morphological similarity poses a great challenge for forensic entomologists. DNA-based method can be used as a supplemental means of morphological method. In the present study, we demonstrate the applicability of the 304-bp cytochrome oxidase I gene fragment in molecular identification of forensically important Diptera. We analyzed 75 specimens belonging to 19 species of 3 families originating from China (Calliphoridae: Chrysomya megacephala, Chrysomya albiceps, Chrysomya rufifacies, Chrysomya nigripes, Aldrichina grahami; Lucilia bazini, Lucilia caesar, Lucilia cuprina, Lucilia sericata, Lucilia porphyrina; Muscidae: Musca autumnalis, Musca domestica, Fannia canicularis, Stomoxys calcitrans; Sarcophagidae: Sarcophaga albiceps, Sarcophaga dux, Helicophagella melanura) and Egypt (Calliphoridae: C. megacephala, C. albiceps, L. sericata; Muscidae: M. domestica, F. canicularis, S. calcitrans, Synthesiomyia nudiseta; Sarcophagidae: Sarcophaga argyrostoma). This region was amplified using polymerase chain reaction followed by direct sequencing of the amplification products. Nucleotide sequence divergences were calculated using the Kimura two-parameter distance model and a neighbor-joining phylogenetic tree generated. Intraspecific variation ranged from 0–0.8 % and interspecific variation occurred between 1–19 %. Although all examined specimens were assigned to the correct species and formed distinct monophyletic clades, the data of the phylogenetic analysis were not completely in accordance with the traditional morphological classification. As both C. nigripes and A. grahami unexpectedly joined with Muscidae and Sarcophagidae groups respectively. Moreover, both Calliphorinae and Luciliinae clades failed to represent Calliphoridae as a separate group. Therefore, although molecular methods are beneficial especially if the available evidence are immature stage or degraded fragments of insect, we suggest using this fragment only in addition to other identification methods.
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Aly, S.M., Wen, J. Applicability of partial characterization of cytochrome oxidase I in identification of forensically important flies (Diptera) from China and Egypt. Parasitol Res 112, 2667–2674 (2013). https://doi.org/10.1007/s00436-013-3449-5
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DOI: https://doi.org/10.1007/s00436-013-3449-5