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• W2892362251 abstract "Oikopleura dioica, the only gonochoric species among appendicularians, has a spematozoon with a mid-piece and a conspicuous acrosome that, during fertilisation, undergoes a reaction forming an acrosomal process. To provide more insight into the spermatogenesis of a holoplanktonic tunicate species that completes its life cycle in three to five days, changes in the testis during individual growth have been examined. Spermatogenesis has been subdivided into seven stages based on ultrastructural features during the formation and organisation of the male gonad and the relationships between its macroscopic anatomy and the events of sperm differentiation. Gametes undergo highly synchronised differentiation due to the presence of widespread syncytial structures. Both meiosis and spermiogenesis are brief, and the passage from spermatocytes to spermatids involves a progressive segregation of the germ cells from the syncytial mass with the formation of large cytoplasmic bridges and volume reduction for nucleus compacting and cytoplasmic material changing. The nucleus is small and penetrated anteriorly by a complex acrosome and posteriorly by the distal centriole and part of the flagellum. In spermatids, the single, large mitochondrion appears laterally to the nucleus, and finally, in spermatozoa, it migrates into the mid-piece, wrapping the proximal portion of the axoneme. Because this mitochondrial position is reached only in the late phases of spermatogenesis, it suggests that appendicularians have derived oligopyrenic sperms in which the small nucleus results from adaptation to the assembly of numerous spermatozoa inside the narrow space of the testis compacted in the genital cavity. The formulation of a staging system of gonad development in a model tunicate species known for having the most compacted genome in chordates led to a comparison of histological observations with recent molecular data, improving the characterisation of its biology and life cycle in light of evolutionary implications." @default.
• W2892362251 created "2018-09-27" @default.
• W2892362251 creator A5023314172 @default.
• W2892362251 date "2019-04-01" @default.
• W2892362251 modified "2023-09-23" @default.
• W2892362251 title "Spermatogenesis as a tool for staging gonad development in the gonochoric appendicularian Oikopleura dioica Fol 1872" @default.
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• W2892362251 doi "https://doi.org/10.1016/j.ydbio.2018.09.004" @default.
• W2892362251 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30213537" @default.
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