Journal of Forensic Medicine ›› 2022, Vol. 38 ›› Issue (2): 231-238.DOI: 10.12116/j.issn.1004-5619.2021.511104

• Original Article • Previous Articles     Next Articles

Establishment of Multiplex Amplification System of STR Loci in Felis Catus and Its Forensic Application

Shi-han XI1,2(), Yi-ling QU2,3, Ruo-cheng XIA2, Lei XIONG2,4, Si-yu CHAI2,5, Chun-lan TONG1, Rui-yang TAO2(), Cheng-tao LI1,2()   

  1. 1.Clinical Medical School of Inner Mongolia Minzu University, Tongliao 028000, Inner Mongolia, China
    2.Shanghai Key Laboratory of Forensic Medicine, Key Laboratory of Forensic Science, Ministry of Justice, Shanghai Forensic Service Platform, Academy of Forensic Science, Shanghai 200063, China
    3.Department of Forensic Medicine, Medical College of Soochow University, Suzhou 215123, Jiangsu Province, China
    4.Department of Forensic Medicine, School of Basic Medicine, Inner Mongolia Medical University, Hohhot 010030, China
    5.School of Preclinical Medicine of Zunyi Medical University, Guizhou 563000, Zunyi Province, China
  • Received:2021-11-15 Online:2022-04-25 Published:2022-04-28
  • Contact: Rui-yang TAO,Cheng-tao LI

Abstract: Objective

To construct a Felis catus STR loci multiplex amplification system and to evaluate its application value by testing the technical performance.

Methods

The published Felis catus STR loci data were reviewed and analyzed to select the STR loci and sex identification loci that could be used for Felis catus individual identification and genetic identification. The fluorescent labeling primers were designed to construct the multiplex amplification system. The system was validated for sensitivity, accuracy, balance, stability, species specificity, tissue identity and mixture analysis, and investigated the genetic polymorphisms in 145 unrelated Felis catus samples.

Results

Sixteen Felis catus autosomal STR loci and one sex determining region of Y (SRY) were successfully selected, and constructed a multiplex amplification system containing the above loci. The complete profile of all alleles could still be obtained when the amount of DNA template was as low as 0.25 ng. There was no specific amplification peak in other common animal samples. Population genetic surveys showed that total discrimination power (TDP) of the 16 STR loci was 1-3.57×10-20, the cumulative probability of exclusion (CPE) was 1-6.35×10-5 and the cumulative probability of matching was 3.61×10-20.

Conclusion

The Felis catus STR multiplex amplification system constructed in this study is highly sensitive, species-specific, and accurate in typing results, which can provide an effective solution for Felis catus species identification, individual identification and kinship identification in the field of forensic science.

Key words: forensic genetics, short tandem repeat, sex determining region of Y (SRY), multiplex amplification system, individual identification, Felis catus

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