Abstract
Deciphering sperm transcriptome is the key to understanding the molecular mechanisms governing peri-fertilization, embryonic development, and pregnancy establishment. This study aimed to profile sperm transcriptome to identify signature transcripts regulating male fertility. Semen samples were collected from 47 bulls with varied fertility rates. The sperm total RNA was isolated (n = 8) and subjected to transcriptome sequencing. Based on the expression pattern obtained from RNA profiling, the bulls were grouped (p = 0.03) into high-fertile and sub-fertile, and signature transcripts controlling sperm functions and fertility were identified. The results were validated using the OMIM database, qPCR, and sperm function tests. The sperm contains 1100 to 1700 intact transcripts, of which BCL2L11 and CAPZA3 were abundant and associated (p < 0.05) with spermatogenesis and post-embryonic organ morphogenesis. The upregulated genes in the acrosome integrity and functional membrane integrity groups had a close association with the fertility rate. The biological functions of these upregulated genes (p < 0.05) in the high-fertile bulls were associated with spermatogenesis (AFF4 and BRIP1), sperm motility (AK6 and ATP6V1G3), capacitation and zona binding (AGFG1), embryo development (TCF7 and AKIRIN2), and placental development (KRT19). The transcripts involved in pathways regulating embryonic development such as translation (EEF1B2 and MTIF3, p = 8.87E−05) and nonsense-mediated decay (RPL23 and RPL7A, p = 5.01E−27) were upregulated in high-fertile bulls. The identified transcripts may significantly impact oocyte function, embryogenesis, trophectoderm development, and pregnancy establishment. In addition, the study also reveals that the genes governing sperm functional membrane integrity and acrosome integrity have a prospective effect on male fertility.
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Acknowledgements
The authors sincerely acknowledge Dr. Raghavendra Bhatta, Director, ICAR-NIANP, Bengaluru, India, for his critical technical inputs, drafting the manuscript and providing necessary facilities to carry out this work. The authors are grateful to Dr. J.P. Ravindra, Former Head, Animal Physiology Division, ICAR-NIANP, for his technical contribution and proofreading of the manuscript. The authors are also thankful to Dr. Maharajan Lavanya for critical reviewing of the manuscript.
Funding
This research was carried out under the ICAR-National Fellow project funded by the Indian Council of Agricultural Research, Government of India. RNA seq data was generated as a part of DBT project (PR3587) funded by the Department of Biotechnology, Government of India. Dr. S. Selvaraju is supported by the ICAR-National Fellow project, ICAR, Ministry of Agriculture, Government of India.
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Conceived, designed the experiment, and bioinformatics analysis: SS, LR, SP, APK, and DS. Performed the experiments: SS, SP, LR, and DS. LR, DS, SP, and APK, and BBK analyzed and drafted the manuscript. All authors: reviewed the manuscript.
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This article does not contain any studies with human participants or animal experiments performed by any of the authors. The experiment does not require Institutional Animal Ethics committee approval, since the experiment was conducted in fresh and frozen semen samples purchased from the commercial semen bank. However, collecting the semen samples and data, all applicable Institutional Animal Ethics guidelines for the care of animals were followed.
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Selvaraju, S., Ramya, L., Parthipan, S. et al. Deciphering the complexity of sperm transcriptome reveals genes governing functional membrane and acrosome integrities potentially influence fertility. Cell Tissue Res 385, 207–222 (2021). https://doi.org/10.1007/s00441-021-03443-6
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DOI: https://doi.org/10.1007/s00441-021-03443-6