Abstract
Short tandem repeat (STR) loci are commonly used in forensic casework, such as personal identification and paternity testing. In recent years, STR has also been widely used for rapid, accurate and automated prenatal diagnosis, known as quantitative fluorescent PCR (QF-PCR). Despite their usefulness, the current systems often lack the power to detect mosaicism for Turner syndrome. In this study, we developed a novel 26-plex system that combined the 22 STRs in chromosome 21/18/13/X, 3 sex loci and 1 quality control marker (TAF9L). The system was generated to achieve greater diagnostic power of trisomy 21/18/13 and sex chromosome abnormalities. Studies of the sensitivity, specificity, stability and accuracy were performed according to the Scientific Working Group on DNA Analysis Methods (SWGDAM) guidelines. Compared with the results of the chromosomal microarray analysis (CMA)/copy number variation sequencing (CNV-seq), the detection ratio of non-mosaic chromosome abnormalities of this system in the identification of chromosome 21/18/13/X/Y aneuploidies reached 100%, and the rate of negative results was consistently 100% based on 203 prenatal diagnosis sample analyses. In addition, our results suggested that this panel was a useful tool for mosaicism for Turner syndrome cases. Interestingly, we found one case with large segment loss of chromosome X, which indicated that we should be alert to this situation when the STR genotype of the parent–child is inconsistent in forensic genetics. In summary, this study demonstrated that our system is an accurate, cost-effective and rapid approach for the detection of chromosome numerical abnormalities in prenatal diagnosis.
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Funding
This project was supported by the Natural Science Foundation of Hunan Province China (grant number 2021JJ41038) and the Major Scientific and Technological Projects for Collaborative Prevention and Control of Birth Defects in Hunan Province (grant number 2019SK1010).
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This study was performed according to Helsinki guidelines and approved by the Human Ethics Subcommittee of Xiangya Hospital of Central South University (Changsha, China) with the ethics approval code 202009626.
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Xie, M., Li, J., Hu, H. et al. Development and validation of a novel 26-plex system for prenatal diagnosis with forensic markers. Int J Legal Med 136, 527–537 (2022). https://doi.org/10.1007/s00414-022-02780-7
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DOI: https://doi.org/10.1007/s00414-022-02780-7