Abstract
Analyzing all biological evidence at a crime scene presents serious time, budget, and labor constraints. Therefore, selecting valid evidence is crucial for efficient screening. The ABO blood group is a marker that can serve as valid evidence for identifying investigative leads in criminal case. Conventional identification of ABO blood groups using serological methods has only been for blood and is difficult to apply to other body fluids. ABO genotyping was conducted by analyzing single nucleotide polymorphisms (SNP) representative of each blood group. However, this method is time-consuming, expensive, and requires sophisticated instruments. In this study, we developed rapid ABO genotyping method using loop-mediated isothermal amplification (LAMP) and multiplex real-time polymerase chain reaction (PCR). Three SNP sites in the ABO gene (nt 261, 526, and 803) were selected to classify the ABO genotypes. For the specificity test, we performed sequencing of 60 saliva samples to confirm that the genotyping. We conducted experiments to apply ABO genotyping using two amplification methods to mock forensic sample using cotton swab and filter paper. As a result, using LAMP, we successfully identified six ABO genotypes within 30 min at a constant temperature (65 ℃). Moreover, by using multiple real-time PCR, it was possible to detect not only the major group but also the subgroup of the ABO genotype (ex. cis-AB). The amplification results using the new methods were in concordance with the sequencing results. Therefore, these ABO genotyping methods are expected to select valid evidence successfully and efficiently at the crime scene.
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Funding
This study was supported and funded by the Korean National Police Agency (Project Name: Development of suspect estimation system through convergence intelligent DNA identification/Project Number: PR10-01–000-21). This study was supported by Korea Basic Science Institute (National Research Facilities and Equipment Center) and grant funded by the Ministry of Education. (Grant No. 2020R1A6C101A191).
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Choi, H., Choi, J., Kwak, K. et al. Rapid ABO genotyping method using loop-mediated isothermal amplification (LAMP) and real-time PCR. Int J Legal Med 138, 751–756 (2024). https://doi.org/10.1007/s00414-023-03144-5
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DOI: https://doi.org/10.1007/s00414-023-03144-5