Abstract
Species identification of biological specimens can provide the valuable clues and accelerate the speed of prosecution material processing for forensic investigation, especially when the case scene is inaccessible and the physical evidence is cumbersome. Thus, establishing a rapid, simple, and field-adapted species identification method is crucial for forensic scientists, particularly as first-line technology at the crime scene for initial rapid screening. In this study, we established a new field-adapted species identification method by combining multiplex multienzyme isothermal rapid amplification (MIRA), lateral flow dipstick (LFD) system, and universal primers. Universal primers targeting COX I and COX II genes were used in multiplex MIRA-LFD system for seven species identification, and a dedicated MIRA-LFD system primer targeting CYT B gene was used to detect the human material. DNA extraction was performed by collecting DNA directly from the centrifuged supernatant. Our study found that the entire amplification process took only 15 min at 37 °C and the results of LFDs could be visually observed after 10 min. The detection sensitivity of human material could reach 10 pg, which is equivalent to the detection of single cell. Different common animal samples mixed at the ratio of 1 ng:1 ng, 10 ng:1 ng, and 1 ng:10 ng could be detected successfully. Furthermore, the damaged and degraded samples could also be detected. Therefore, the convenient, feasible, and rapid approach for species identification is suitable for popularization as first-line technology at the crime scene for initial rapid screening and provides a great convenient for forensic application.
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The data sets used and/or analyzed during this study are available from the corresponding author on reasonable request.
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Funding
This study was supported by the Natural Science Foundation Medical-Industrial Crossover Joint Fund Program of Liaoning Province (2022-YGJC-45) and the project of China Medical University-Shenyang Branch of Chinese Academy of Sciences Scientist Partner in 2022 (HZHB2022008).
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Mao-ling Sun and Ying Yang are co-first authors.
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Sun, Ml., Yang, Y., Hu, R. et al. Simple and field-adapted species identification of biological specimens combining multiplex multienzyme isothermal rapid amplification, lateral flow dipsticks, and universal primers for initial rapid screening without standard PCR laboratory. Int J Legal Med 138, 561–570 (2024). https://doi.org/10.1007/s00414-023-03101-2
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DOI: https://doi.org/10.1007/s00414-023-03101-2