章鱼精子结构的转变:从生精到生精释放。

IF 2.6 3区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
PLoS ONE Pub Date : 2025-01-22 eCollection Date: 2025-01-01 DOI:10.1371/journal.pone.0316519
Hyeon Jin Kim, Jung Jun Park, Jung Sick Lee
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引用次数: 0

摘要

本研究描述了寻常章鱼雄性生殖细胞的分化过程,精子在睾丸和精包中的形态,以及包精反应后释放的精子。在精子发生过程中,雄性精子细胞从圆形逐渐伸长,细胞质向头部移动,顶体形成。此外,在精子期,鞭毛在核后通道内发育,并向细胞质外延伸。精子由头和尾组成。头部长约17.9 μm,由电子密度高的细胞核和螺旋顶体组成。尾巴分为三个部分:中间部分、主部分和末端部分。中间部分形成一个线粒体鞘,7-8个线粒体围绕一个“9+2”轴突。主片由轴突、外密纤维和纤维鞘组成,终片没有外密纤维和纤维鞘。睾丸中的精子和包囊,以及包囊反应后释放的精子具有相同的结构。然而,在位于睾丸和精子包囊的精子中,由于头部存在细胞质,顶体的结构不清楚。相反,保精反应后释放的精子缺少细胞质,呈现螺旋顶体。这种独特的精子形态,适合于内部受精,被认为有利于受精和长期储存在女性生殖系统中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Transformation of sperm structure in Octopus vulgaris: From spermatogenesis to spermatophoric release.

The present study describes the differentiation process of male germ cells in Octopus vulgaris, the morphology of sperm in the testis and spermatophore, and the sperm released after the spermatophoric reaction. During spermatogenesis, the male sperm cell gradually elongates from a round shape, with cytoplasm shifting toward the head and the acrosome forming. Additionally, in the spermatid stage, the flagellum develops within the posterior nuclear channel and extends outside the cytoplasm. The sperm is composed of a head and a tail. The head is approximately 17.9 μm long and consists of a highly electron-dense nucleus and a helical acrosome. The tail is divided into three parts: the mid-piece, principal-piece, and end-piece. The mid-piece forms a mitochondrial sheath with 7-8 mitochondria surrounding a "9+2" axoneme. The principal-piece is composed of an axoneme, outer dense fibers, and fibrous sheath, while the end piece lacks outer dense fibers or fibrous sheath. The sperm in the testis and spermatophore, and the sperm released after the spermatophoric reaction have the same structure. However, in the sperm located in the testis and spermatophore, the structure of the acrosome is unclear due to the presence of cytoplasm in the head. In contrast, sperm released after the spermatophoric reaction lack their cytoplasm, revealing the helical acrosome. This unique sperm morphology, adapted for internal fertilization, is thought to be advantageous for fertilization and long-term storage within the female reproductive system.

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来源期刊
PLoS ONE
PLoS ONE 生物-生物学
CiteScore
6.20
自引率
5.40%
发文量
14242
审稿时长
3.7 months
期刊介绍: PLOS ONE is an international, peer-reviewed, open-access, online publication. PLOS ONE welcomes reports on primary research from any scientific discipline. It provides: * Open-access—freely accessible online, authors retain copyright * Fast publication times * Peer review by expert, practicing researchers * Post-publication tools to indicate quality and impact * Community-based dialogue on articles * Worldwide media coverage
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