Abstract
Asthenozoospermia (AZS) is a common male infertility phenotype, accounting for 18% of infertile patients. The N-DRC (Nexin-dynein Regulatory Complex) complex is the motor regulating device in the flagellum, which is found in most eukaryotic organisms with flagellum. The deletion of TCTE1 (T-Complex-Associated Testis-Expressed 1), a component of the N-DRC complex also known as DRC5 (Dynein regulatory complex subunit 5), has been shown to cause asthenospermia in mice. This study mainly introduces a clinical case of male infertility with normal sperm count, normal morphological structure, but low motility and weak forward movement. By whole-exome sequencing, we found that TCTE1 became a frameshift mutant, ENST00000371505.5: c.396_397insTC (p.Arg133Serfs*33), resulting in the rapid degradation of TCTE1 protein and male infertility. This phenotype is similar to the Tcte1−/− (Tcte1 knockout) mice, which showed structural integrity but reduced motility. Further, different from mice, in vitro Fertilization (IVF) could successfully solve the patient’s problem of infertility. Our data provides a better understanding of the biological functions of TCTE1 in human flagellum assembly and male fertility.
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Acknowledgements
We extend our appreciation to Fan Hu and Jinyang Cai for their support and provision of the microscope.
Funding
This work was supported by the Natural Science Foundation of China (31771654 and 32070842 to ML, 32000584 to RH, 82171607 to XH, 81901541 to HW); the Non-profit Central Research Institute Fund of the Chinese Academy of Medical Sciences (Grant no. 2019PT310002 to YC); the Natural Science Foundation of Jiangsu Province (Grants No. BK20190081 to ML); the Science and Technology Project of Anhui Province (Grant No.202003a07020012 to PZ); and Qing Lan Project (to ML).
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Clinical exome sequencing was approved by the ethics committees of the First Affiliated Hospital of Anhui Medical University, Number P2020-12-36. All human subjects provided informed consent for this study.
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Zhou, S., Wu, H., Zhang, J. et al. Bi-allelic variants in human TCTE1/DRC5 cause asthenospermia and male infertility. Eur J Hum Genet 30, 721–729 (2022). https://doi.org/10.1038/s41431-022-01095-w
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DOI: https://doi.org/10.1038/s41431-022-01095-w
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