Czech J. Anim. Sci., 2020, 65(3):86-96 | DOI: 10.17221/7/2020-CJAS

Expression and localization of PIWI proteins in testis and ovary of domestic sheepOriginal Paper

Chunyan Li1,2, Qiuyue Liu1, Xiangyu Wang1, Wenping Hu1, Deping Han3, Joram Mwashigadi Mwacharo4, Caihong Wei1, Mingxing Chu*,1, Ran Di ORCID...*,1
1 Key Laboratory of Animal Genetics and Breeding and Reproduction of Ministry of Agriculture and Rural Affairs, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, P. R. China
2 College of Animal Science and Technology, Anhui Agricultural University, Hefei, P. R. China
3 College of Veterinary Medicine, China Agricultural University, Beijing, P. R. China
4 Small Ruminant Genomics, International Centre for Agricultural Research in the Dry Areas (ICARDA), Addis Ababa, Ethiopia

The piRNA-PIWI protein complex plays crucial roles in safeguarding the genome against inordinate transposon mobilization and regulation of embryonic development. A previous study indicated the presence of piRNA in sheep reproductive organs. However, the tissue distribution and cellular localization of PIWI proteins in sheep remains unclear. Therefore the present study aimed to explore the expression profiles of mRNAs of mammalian PIWI proteins (PIWIL1, PIWIL2, PIWIL4 and AGO3) in 9 tissues derived from adult male and female sheep. Results showed the expression of PIWIL1, PIWIL2, and PIWIL4 was significantly higher in the testis and ovary than in the other tissues. Immunohistochemistry analysis of testes indicated that each of the 4 proteins had specific cellular localizations, and some of the localizations were different from those of other species. All the proteins were mainly localized in the primary spermatocytes, suggesting that they are crucial for silencing of transposon to guarantee the integrity of the gamete genome during early stage of spermatogenesis. In the ovaries, the PIWI proteins were mainly localized in oocytes from antral follicles and leukocytes in ovarian blood. Our results provide insights to better understand the functions of PIWI proteins during spermatogenesis, oogenesis and immune defence in sheep.

Keywords: PIWI proteins; reproduction; localization; testis; ovary

Published: March 31, 2020  Show citation

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Li C, Liu Q, Wang X, Hu W, Han D, Mwacharo JM, et al.. Expression and localization of PIWI proteins in testis and ovary of domestic sheep. Czech J. Anim. Sci.. 2020;65(3):86-96. doi: 10.17221/7/2020-CJAS.
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