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Vertebrate reproductive science and technology
RESEARCH ARTICLE

Comparative analysis of testis transcriptomes associated with male infertility in triploid cyprinid fish

Wuhui Li A B * , Hui Tan A B * , Junmei Liu A B * , Jie Hu A B * , Jialin Cui A B , Shi Wang A B , Qingfeng Liu A B , Fangzhou Hu A B , Li Ren A B , Min Tao A B , Rurong Zhao A B , Conghui Yang A B , Qinbo Qin A B and Shaojun Liu orcid.org/0000-0002-1960-2533 A B C
+ Author Affiliations
- Author Affiliations

A State Key Laboratory of Developmental Biology of Freshwater Fish, Hunan Normal University, Changsha, 410081, Hunan, P.R. China.

B College of Life Sciences, Hunan Normal University, Changsha, 410081, Hunan, P.R. China.

C Corresponding author. Email: lsj@hunnu.edu.cn

Reproduction, Fertility and Development 31(2) 248-260 https://doi.org/10.1071/RD18034
Submitted: 25 January 2018  Accepted: 24 June 2018   Published: 8 August 2018

Abstract

Spermatogenesis involves a series of cellular transformations and thousands of regulated genes. Previously, we showed that the triploid fish (3nBY) cannot produce mature spermatozoa. In the present study, evaluation of the testis microstructure revealed that germ cells of 3nBY could develop into round spermatids, but then degenerated, resulting in male infertility. In this study we comparatively analysed the testis transcriptomes from 3nBY and its diploid parent YB and identified a series of differentially expressed genes (DEGs) that were enriched in the Wnt signalling pathway and the apoptotic and ubiquitin-mediated proteolysis processes in 3nBY. Gene ontology functional analyses revealed that some DEGs in 3nBY were directly associated with the process of gamete generation, development and sperm flagellum assembly. In addition, the expression of a number of genes related to meiosis (Inhibitor Of DNA Binding 2 (ID2), Ovo Like Transcriptional Repressor 1 (OVOL1)), mitochondria (ATP1b (ATPase Na+/K+ Transporting Subunit Beta 1), ATP2a (ATPase, Ca++ Transporting, Cardiac Muscle, Slow Twitch 2), ATP5a (ATP Synthase F1 Subunit Alpha), Mitochondrially Encoded Cytochrome C Oxidase I (COX1), NADH Dehydrogenase Subunit 4 (ND4)) and chromatin structure (Histone 1 (H1), Histone 2a (H2A), Histone 2b (H2B), Histone 3 (H3), Histone 4 (H4)) was lower in the testes of 3nBY, whereas the expression of genes encoding ubiquitin (Ubiquitin Conjugating Enzymes (UBEs), Ring Finger Proteins (RNFs)) and apoptosis (CASPs (Caspase 3, Caspase 7,Caspase 8), BCLs (B-Cell Lymphoma 3, B-Cell CLL/Lymphoma 2, B Cell CLL/Lymphoma 10)) proteins involved in spermatid degeneration was higher. These data suggest that the disrupted expression of genes associated with spermatogenesis and the increased expression of mitochondrial ubiquitin, which initiates cell apoptosis, may result in spermatid degeneration in male 3nBY. This study provides information regarding the potential molecular regulatory mechanisms underlying male infertility in polyploid fish.

Additional keywords : spermatid degeneration, spermiogenesis.


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