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Asymmetry in the cytoplasm of oocytes of largescale yellowfish Labeobarbus marequensis Smith 1841 (Teleostei: Cypriniformes: Cyprinidae)
Journal of Morphology ( IF 1.5 ) Pub Date : 2020-06-20 , DOI: 10.1002/jmor.21228 Monika Żelazowska 1 , Ali Halajian 2
Journal of Morphology ( IF 1.5 ) Pub Date : 2020-06-20 , DOI: 10.1002/jmor.21228 Monika Żelazowska 1 , Ali Halajian 2
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The ovaries of the largescale yellowfish, Labeobarbus marequensis (Teleostei: Cypriniformes: Cyprinidae), are made up of the germinal epithelium, nests of late chromatin nucleolus stage oocytes, and ovarian follicles. Each follicle is composed of a single oocyte, which is surrounded by somatic follicular cells and a basal lamina covered by thecal cells. We describe polarization and ultrastructure of oocytes during the primary growth stage. The oocyte nucleus contains lampbrush chromosomes, nuclear bodies and fibrillar material in which multiple nucleoli arise. Nuage aggregations composed of material of a nuclear origin are present in the perinuclear cytoplasm. The Balbiani body (Bb) contains aggregations of nuage, rough endoplasmic reticulum, individual mitochondria and complexes of mitochondria with nuage (cement). Some mitochondria in the Bb come into close contact with endoplasmic reticulum cisternae and vesicles that contain granular material. At the start of primary growth, the Bb is present in the cytoplasm close to the nucleus. Next, it expands towards the oocyte plasma membrane. In these oocytes, a spherical structure, the so‐called yolk nucleus, arises in the Bb. It consists of granular nuage in which mitochondria and vesicles containing granular material are immersed. Later, the Bb becomes fragmented and a fully grown yolk nucleus is present in the vegetal region. It contains numerous threads composed of granular nuage, mitochondria, lysosome‐like organelles and autophagosomes. We discuss the formation of autophagosomes in the cytoplasm of primary growth oocytes. During the final step of primary growth, the cortical alveoli arise in the cytoplasm and are distributed evenly. The eggshell is deposited on the external surface of the oocyte plasma membrane and is made up of two egg envelopes that are pierced by numerous pore canals. The external egg envelope is covered in protuberances. During primary growth no lipid droplets are synthesized or stored in the oocytes.
中文翻译：
大型黄鱼 Labeobarbus marequensis Smith 1841 卵母细胞细胞质的不对称性（Teleostei：Cypriniformes：Cyprinidae）
大型黄鱼 Labeobarbus marequensis (Teleostei: Cypriniformes: Cyprinidae) 的卵巢由生发上皮、晚期染色质核仁阶段卵母细胞的巢和卵泡组成。每个卵泡由单个卵母细胞组成，卵母细胞被体细胞卵泡细胞和被膜细胞覆盖的基底层包围。我们描述了初级生长阶段卵母细胞的极化和超微结构。卵母细胞核包含灯刷染色体、核体和纤维状物质，其中产生多个核仁。由核来源的材料组成的 Nuage 聚集体存在于核周细胞质中。Balbiani 小体 (Bb) 包含 nuage、粗面内质网、单个线粒体和线粒体与 nuage（水泥）的复合物的聚集体。Bb 中的一些线粒体与内质网池和含有颗粒物质的囊泡密切接触。在初级生长开始时，Bb 存在于靠近细胞核的细胞质中。接下来，它向卵母细胞质膜扩展。在这些卵母细胞中，球形结构，即所谓的卵黄核，出现在 Bb 中。它由粒状细胞组成，其中浸有含有粒状物质的线粒体和囊泡。后来，Bb 变得支离破碎，植物区出现一个完全生长的蛋黄核。它包含许多由颗粒状细胞、线粒体、溶酶体样细胞器和自噬体组成的线。我们讨论了初级生长卵母细胞细胞质中自噬体的形成。在初级生长的最后一步，皮质肺泡出现在细胞质中，分布均匀。蛋壳沉积在卵母细胞质膜的外表面上，由两个被无数孔道刺穿的卵膜组成。外部蛋壳覆盖着突起。在初级生长期间，卵母细胞中不会合成或储存脂滴。
更新日期：2020-06-20
中文翻译：
大型黄鱼 Labeobarbus marequensis Smith 1841 卵母细胞细胞质的不对称性（Teleostei：Cypriniformes：Cyprinidae）
大型黄鱼 Labeobarbus marequensis (Teleostei: Cypriniformes: Cyprinidae) 的卵巢由生发上皮、晚期染色质核仁阶段卵母细胞的巢和卵泡组成。每个卵泡由单个卵母细胞组成，卵母细胞被体细胞卵泡细胞和被膜细胞覆盖的基底层包围。我们描述了初级生长阶段卵母细胞的极化和超微结构。卵母细胞核包含灯刷染色体、核体和纤维状物质，其中产生多个核仁。由核来源的材料组成的 Nuage 聚集体存在于核周细胞质中。Balbiani 小体 (Bb) 包含 nuage、粗面内质网、单个线粒体和线粒体与 nuage（水泥）的复合物的聚集体。Bb 中的一些线粒体与内质网池和含有颗粒物质的囊泡密切接触。在初级生长开始时，Bb 存在于靠近细胞核的细胞质中。接下来，它向卵母细胞质膜扩展。在这些卵母细胞中，球形结构，即所谓的卵黄核，出现在 Bb 中。它由粒状细胞组成，其中浸有含有粒状物质的线粒体和囊泡。后来，Bb 变得支离破碎，植物区出现一个完全生长的蛋黄核。它包含许多由颗粒状细胞、线粒体、溶酶体样细胞器和自噬体组成的线。我们讨论了初级生长卵母细胞细胞质中自噬体的形成。在初级生长的最后一步，皮质肺泡出现在细胞质中，分布均匀。蛋壳沉积在卵母细胞质膜的外表面上，由两个被无数孔道刺穿的卵膜组成。外部蛋壳覆盖着突起。在初级生长期间，卵母细胞中不会合成或储存脂滴。
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