Cytological steps during spermiogenesis in the house sparrow (Passes domesticus, Linnaeus)

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dc.contributor.authorGoes, R. M.
dc.contributor.authorDolder, H.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.date.accessioned2014-05-20T15:21:30Z
dc.date.available2014-05-20T15:21:30Z
dc.date.issued2002-08-01
dc.description.abstractSpermiogenesis of the domestic sparrow was investigated with the light and electron microscopes and a step by step classification is proposed. Three cell populations corresponding to early, mid and late spermatids were easily divided according to their positions in the seminiferous epithelium. In addition to this initial separation, six steps were recognized, based on nuclear morphology and the degree of chromatin condensation, in association to their acrosomal and flagellar development. Early spermiogenesis is the period previous to chromatin condensation. The first step can be recognized by the extending flagellum and the second by the pro-acrosome development in contact with the nucleus. During the third or intermediate step, chromatin condenses and the cell becomes polarized with the pro-acrosomic vesicle and the tail occupying opposite sides of the nucleus. Late spermiogenesis, including steps IV-VI, is marked by complete chromatin condensation. The final cellular modifications lead to the formation of a spiraled spermatozoon. This shape is due to the twisting of the acrosome and nucleus, as well as the helical arrangement of mitochondria around the axoneme along most of the flagellum, making an exceptionally long middle piece. (C) 2002 Elsevier B.V. Ltd. All rights reserved.en
dc.description.affiliationUniv Estadual Paulista, Inst Biociencias Letras & Ciências Exatas, Dept Biol, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationUNICAMP, IB, Dept Biol Celular, Campinas, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Biociencias Letras & Ciências Exatas, Dept Biol, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.format.extent273-282
dc.identifierhttp://dx.doi.org/10.1016/S0040-8166(02)00017-4
dc.identifier.citationTissue & Cell. Edinburgh: Churchill Livingstone, v. 34, n. 4, p. 273-282, 2002.
dc.identifier.doi10.1016/S0040-8166(02)00017-4
dc.identifier.issn0040-8166
dc.identifier.lattes0947193347312157
dc.identifier.orcid0000-0002-3622-460X
dc.identifier.urihttp://hdl.handle.net/11449/32636
dc.identifier.wosWOS:000178638700005
dc.language.isoeng
dc.publisherChurchill Livingstone
dc.relation.ispartofTissue & Cell
dc.relation.ispartofjcr1.438
dc.relation.ispartofsjr0,410
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectspermiogenesispt
dc.subjectpasserine birdpt
dc.subjectultrastructurept
dc.titleCytological steps during spermiogenesis in the house sparrow (Passes domesticus, Linnaeus)en
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderChurchill Livingstone
unesp.author.lattes0947193347312157[1]
unesp.author.orcid0000-0002-3622-460X[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências Letras e Ciências Exatas, São José do Rio Pretopt

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