title: CDC20 downregulation impairs spindle morphology and causes reduced first polar body emission during bovine oocyte maturation.
abstract: The cell division cycle protein 20 (CDC20) is an essential regulator of cell division, encoded by the CDC20 gene. However, the role of CDC20 in bovine oocyte maturation is unknown. In this study, CDC20 morpholino antisense oligonucleotides (MOs) were microinjected into the cytoplasm of bovine oocytes to block the translation of CDC20 mRNA. CDC20 downregulation significantly reduced the rate of first polar body emission (PB1). Further analysis indicated that oocytes treated with CDC20 MO arrested before or at meiotic stage I with abnormal spindles. To further confirm the functions of CDC20 during oocyte meiotic division, CDC20 MOs were microinjected into oocytes together with a supplementary PB1. The results showed that newly synthesized CDC20 was not necessary at the meiosis II-to-anaphase II transition. Our data suggest that CDC20 is required for spindle assembly, chromosomal segregation, and PB1 extrusion during bovine oocyte maturation.
authors.affiliation: College of Veterinary Medicine, Northwest A&F University, Yangling, P. R. China; Shaanxi Center of Stem Cell Engineering & Technology, Yangling, P. R. China; Department of Life Science and Technology, Ningxia Polytechnic, Yinchuan, P. R. China.
authors.forename: W L
authors.initials: WL
authors.lastname: Yang
authors.affiliation: College of Veterinary Medicine, Northwest A&F University, Yangling, P. R. China; Shaanxi Center of Stem Cell Engineering & Technology, Yangling, P. R. China.
authors.forename: J
authors.initials: J
authors.lastname: Li
authors.affiliation: College of Veterinary Medicine, Northwest A&F University, Yangling, P. R. China; Shaanxi Center of Stem Cell Engineering & Technology, Yangling, P. R. China.
authors.forename: P
authors.initials: P
authors.lastname: An
authors.affiliation: College of Veterinary Medicine, Northwest A&F University, Yangling, P. R. China; Shaanxi Center of Stem Cell Engineering & Technology, Yangling, P. R. China. Electronic address: anminleiryan@nwsuaf.edu.cn.
authors.forename: A M
authors.initials: AM
authors.lastname: Lei
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D064199:Cdc20 Proteins / Q000235:genetics / Q000502:physiology*; D016009:Chi-Square Distribution; D015536:Down-Regulation / Q000235:genetics / Q000502:physiology*; D005260:Female; D008540:Meiosis / Q000502:physiology*; D008856:Microscopy, Fluorescence / Q000662:veterinary; D016376:Oligonucleotides, Antisense / Q000494:pharmacology; D009865:Oocytes / Q000502:physiology*; D059705:Polar Bodies / Q000502:physiology; D008941:Spindle Apparatus / Q000235:genetics / Q000502:physiology*
chemical_list: D064199:Cdc20 Proteins; D016376:Oligonucleotides, Antisense
keywords: Bovine oocyte maturation; CDC20 downregulation; Spindle morphology