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YAN Anxin, TU Zheng, WANG Chong, PENG Zhu, ZHANG Qingjun. Avoidance against Occurring Signal Crosstalk between Capillaries of Forensic DNA Genetic Analyzer[J]. Forensic Science and Technology,2020,45(5): 464-467
Avoidance against Occurring Signal Crosstalk between Capillaries of Forensic DNA Genetic Analyzer
YAN Anxin1, TU Zheng1, WANG Chong1, PENG Zhu1, ZHANG Qingjun2
1. Institute of Forensic Science of Ministry of Public Security, Beijing 100038, China
2. Institute of Forensic Science of Luoyang Public Security Bureau, Luoyang 471000, Henan, China
Abstract
Objective To analyze the signal crosstalk occurring between the capillaries of lane-multiple forensic DNA genetic analyzer.Methods The 3500xL genetic analyzer installed of 24 lane-capillaries was chosen to conduct the capillary electrophoretic experiments, having being carried out of two-group test with the experimental group: one capillary lane being selected for overloading the amplification products of an STR-profile-positive sample and one capillary lane for loading the allele ladder, with the rest 22 capillary lanes being filled of only the blank reagent without samples; and the control group: one capillary lane chosen for the allele ladder to load and the remaining 23 capillary lanes being full of the blank reagent.Results For the experimental group, the crosstalk signals were detected with height-low peaks appearing in the adjacent capillary lanes where such peaks should otherwise not have emerged since only the blank reagent existed there. For the control group, no crosstalk signals were observed.Conclusions Signal crosstalk may occur between the immediately-connecting capillary lanes during the capillary electrophoresis of PCR-amplified products to have their STR genotypes profiled. Overloading is the major cause of such phenomena. When a sample is overloaded into a capillary lane, crosstalk signals will likely be detected with height-low peaks appearing in the adjacent capillary lanes where if blank or low-concentration samples were added. The signal crosstalk may also result from the analyzer's hardware spatial malfunction or calibration failure.
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张广峰, 陈松, 凃政, 等. 接触DNA检验成功率的影响因素探讨[J]. , 2013, 38(3): 9-13. (ZHANGGuangfeng, CHENSong, TUZheng, et al. Discussion on the factors affecting success rate of touch DNA analysis[J]. , 2013, 38(3): 9-13. )