Journal of Forensic Medicine

法医学杂志 ›› 2019, Vol. 35 ›› Issue (2): 210-215.DOI: 10.12116/j.issn.1004-5619.2019.02.015

Previous Articles     Next Articles

Evaluating the Efficiency of REPLI-g?? Single Cell Kit for Trace DNA Amplification

XU Qian-nan1,2, SHEN Qiong3, ZHANG Jia-yi2,4, ZHANG Yi-lun2,5, LI Li2, LIU Xi-ling2, LI Cheng-tao1,2   

  1. 1. Department of Forensic Medicine, School of Basic Medical Sciences, Wenzhou Medical University, Wenzhou 325035, Zhejiang Province, China; 2. Shanghai Key Laboratory of Forensic Medicine, Shanghai Forensic Service Platform, Academy of Forensic Science, Shanghai 200063, China; 3. Department of Ultrasound Diagnosis, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 201999, China; 4. Department of Forensic Medicine, Inner Mongolia Medical University, Hohhot 010030, China; 5. Baotou Medical College, Inner Mongolia University of Science & Technology, Baotou 014060, Inner Mongolia Autonomous Region, China
  • Online:2019-04-25 Published:2019-04-28

PDF (PC)

729

Abstract: Objective To evaluate the efficiency of REPLI-g?? Single Cell Kit for sample DNA amplification, and explore its application value in forensic trace DNA amplification. Methods Three DNA extraction kits were selected to extract DNA from peripheral blood of 10 unrelated individuals. The DNA yield and purity of the three DNA extraction kits were compared. According to the results of comparison, one DNA sample was selected to concentrate and dilute, then used as the initial sample of whole genome amplification （WGA）. REPLI-g?? Single Cell Kit was used to amplify the initial sample at the whole genome level. The amplification yield and amplification times were calculated, and the distribution of DNA fragments was detected by agarose gel electrophoresis. GoldeneyeTM DNA ID System 20A Kit was used to perform the STR typing of the initial sample and DNA samples amplified at the whole genome level to evaluate the performance of REPLI-g?? Single Cell Kit in trace DNA amplication in terms of purity and yield as well as the success rate of STR typing. Results After comparison, one DNA sample was selected from QIAsymphony?? DNA Investigator?? Kit extracts to concentrate and dilute as the initial sample of WGA. After amplifying the whole genome of a series of initial samples by REPLI-g?? Single Cell Kit, the lowest average of amplification yield reached 8.77×103 ng, while the average of the corresponding amplification times reached 1.40×106. DNA fragments were large and concentrated. The STR typing success rate of WGA samples became lower with the decrease of initial samples used, but when the amount of samples was lower than 0.5 ng, the STR typing success rate of samples after DNA WGA was higher than that of samples without DNA WGA. Conclusion REPLI-g?? Single Cell Kit can increase the yield of template DNA. Especially for trace DNA, the STR typing success rate can be improved to a certain extent.

Key words: forensic genetics, short tandem repeat, whole genome amplification, multiple displacement amplification, trace samples