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Identification of forensically important sarcophagid flies (Diptera: Sarcophagidae) in China based on COI and period gene

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Abstract

Unequivocal identification of insect specimens is an essential requirement in forensic entomology. With the development of molecular identification, spate of discussions about the feature of the DNA fragments have been raised. Relying solely on single DNA fragment for delimiting closely related species is supposed to be dangerous. Aiming at obtaining more reliable markers that might be universally used, we explore the utility of 700-bp COI fragment and 678-bp period gene fragment in the identification of Sarcophagidae (Diptera). Thirty-six sarcophagid fly specimens were collected from 19 locations in 11 Chinese provinces. Phylogenetic analysis of the sequenced segments showed that all sarcophagid specimens were properly assigned into nine species with relatively strong supporting values, which indicated the possibility of separation congeneric species with COI and period gene fragments. The difference between intraspecific threshold and interspecific divergence confirmed that the combination of nuclear and mitochondrial genes for species identification is much more accurate. The results of this research will be instrumental for implementation of the Chinese Sarcophagidae database.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (NSFC, no. 81302615), Science Foundation for The Youth Scholars of Central South University (no.120959), and Central South University student innovation test plan (2282013bks070). Yadong Guo is a postdoctoral fellow of School of Basic Medical Sciences. Thanks to all the members of the forensic interest community of Central South University for samples collection. We also thank Prof. SONG Dong-Bao and Ph.D. HUANG Guo-Hua (Plant Protection Department, College of Bio-safety Science and Technology, Hunan Agricultural University) for identifications of insects.

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Authors and Affiliations

  1. Department of Forensic Science, School of Basic Medical Sciences, Central South University, Changsha, 410013, Hunan, China

    Yadong Guo, Lagabaiyila Zha, Weitao Yan, Pei Li & Jifeng Cai

  2. Department of Physiology, School of Basic Medical Sciences, Central South University, Changsha, 410013, Hunan, China

    Yadong Guo & LiXiang Wu

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  1. Yadong Guo
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  2. Lagabaiyila Zha
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  3. Weitao Yan
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  5. Jifeng Cai
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  6. LiXiang Wu
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Correspondence to LiXiang Wu.

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Guo, Y., Zha, L., Yan, W. et al. Identification of forensically important sarcophagid flies (Diptera: Sarcophagidae) in China based on COI and period gene. Int J Legal Med 128, 221–228 (2014). https://doi.org/10.1007/s00414-013-0923-7

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  • DOI: https://doi.org/10.1007/s00414-013-0923-7

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