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Magnetic bead-based separation of sperm cells from semen-vaginal fluid mixed stains using an anti-ACRBP antibody

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Abstract 

Forensic DNA analysis of semen-vaginal fluid mixed stains is essential and necessary in sexual assault cases. Here, we used a magnetic bead conjugated acrosin binding protein (ACRBP) antibody to separate and enrich sperm cells from mixed stains. Previously, western blotting indicated that ACRBP was specifically expressed in sperm cells, but not in female blood and epithelial cells, while immunofluorescence data showed ACRBP was localized to the acrosome in sperm cells. In our study, sperm were separated from mixed samples at three sperm cell/female buccal epithelial cell ratios (103:103; 103:104; and 103:105) using a magnetic bead conjugated ACRBP antibody. Subsequently, 23 autosomal short tandem repeat (STR) loci were amplified using the Huaxia™ Platinum PCR Amplification System and genotyped using capillary electrophoresis. The genotyping success rate for STR loci was 90% when the sperm to female buccal epithelial cell ratio was > 1:100 in mixed samples. Our results suggest that the magnetic bead conjugated ACRBP antibody is effective for isolating sperm cells in sexual assault cases.

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Funding

This study was supported by Open Project of Shanghai Key Laboratory of Forensic Medicine and Judicial Expertise by the Ministry of Justice Key Laboratory (No. KF202110) and Basic Scientific Research Project of the Ministry of Public Security (No. 3242020014).

This study was approved by the Ethics Committee of China Medical University. All the participants were included after providing the written informed consent.

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Correspondence to Xiu-peng Zhang or Jun Yao.

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Li, Xn., Xu, Fl., Zheng, Jl. et al. Magnetic bead-based separation of sperm cells from semen-vaginal fluid mixed stains using an anti-ACRBP antibody. Int J Legal Med 137, 511–518 (2023). https://doi.org/10.1007/s00414-022-02917-8

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  • DOI: https://doi.org/10.1007/s00414-022-02917-8

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