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Several studies have assessed the performance of semen\u2010specific mRNA markers in distinguishing semen from other common body fluids at the crime scene. Infertility has been reported as a global health problem that is affecting approximately 15% of couples worldwide. Therefore, it is important for forensic researchers to consider the impact of infertility on semen identification. This study aimed to explore the effect of semen from infertile men (hereinafter \u201cinfertile semen\u201d) on BFI and to identify semen\u2010specific mRNAs that can efficiently and accurately distinguish normal and infertile semen samples from other body fluids. Results showed that the selected five mRNAs (KLK3, TGM4, SEMG1, PRM1, and PRM2) performed a significantly high semen specificity in normal semen. Moreover, KLK3 was slightly influenced by infertile semen samples with over 98% positive results in all semen samples. The accuracy to predict normal semen reached up to 96.6% using the discrimination function Y1 with KLK3 and PRM1. However, when the infertile semen samples were included in discrimination function (function Y2 with KLK3), the accuracy rate of semen identification (including the normal and infertile semen) was down to 89.5%. Besides, the sensitivity of multiplex assay could reach down to 50pg. Our results suggest that it is important to consider the presence of infertile semen when using mRNAs to identify semen samples, which would have a far\u2010reaching impact in forensic identification.<\/jats:p>","DOI":"10.1002\/elps.202000238","type":"journal-article","created":{"date-parts":[[2021,7,7]],"date-time":"2021-07-07T15:34:00Z","timestamp":1625672040000},"page":"1614-1622","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["The effect of infertile semen on the mRNA\u2010based body fluid identification"],"prefix":"10.1002","volume":"42","author":[{"given":"Huan","family":"Tian","sequence":"first","affiliation":[{"name":"Department of Forensic Genetics, West China School of Basic Medical Sciences &amp; Forensic Medicine Sichuan University  Chengdu Sichuan P. R. 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