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The competence of germinal vesicle oocytes is unrelated to nuclear chromatin configuration and strictly depends on cytoplasmic quantity and quality in the cat model

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dc.contributor.author Comizzoli, Pierre en
dc.contributor.author Pukazhenthi, Budhan S. en
dc.contributor.author Wildt, David E. en
dc.date.accessioned 2013-02-15T19:26:24Z
dc.date.available 2013-02-15T19:26:24Z
dc.date.issued 2011
dc.identifier.citation Comizzoli, Pierre, Pukazhenthi, Budhan S., and Wildt, David E. 2011. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F19536">The competence of germinal vesicle oocytes is unrelated to nuclear chromatin configuration and strictly depends on cytoplasmic quantity and quality in the cat model</a>." <em>Human Reproduction</em>. 26 (8):2165&ndash;2177. <a href="https://doi.org/10.1093/humrep/der176">https://doi.org/10.1093/humrep/der176</a> en
dc.identifier.issn 0268-1161
dc.identifier.uri http://hdl.handle.net/10088/19536
dc.description.abstract BACKGROUND Chromatin configuration of the germinal vesicle (GV) and quality of the cytoplasm are critical factors in achieving oocyte meiotic and developmental capacity during folliculogenesis. Besides gaining new insights into the timing and cellular mechanisms associated with the acquisition and regulation of GV oocyte competence, the domestic cat model was used to examine (i) the relation between GV chromatin configuration and oocyte functionality during folliculogenesis and (ii) the role of the cytoplasmic environment on the GV competence and stability.METHODS Structural and functional properties of GV oocytes were characterized after isolation from different follicle stages of non-stimulated cat ovaries. GV transfers, artificial chromatin compaction and oocyte vitrification were used to demonstrate the respective roles of GV and cytoplasm on the oocyte functionality.RESULTS GVs acquired the intrinsic capability to resume meiosis during the pre-antral follicle stage, whereas the capacity to support embryo development occurred while the antrum started to form. Chromatin configuration of the GV did not undergo extensive modification during the acquisition of competence or during the arrest of transcriptional activity at the large antral follicle stage. However, the quality and quantity of the cytoplasm regulated and enhanced GV functionality. This finding also held for GVs transferred from incompetent or subpar oocytes into the cytoplasm of good quality oocytes or when chromatin was artificially modified or vitrified.CONCLUSIONS The cat model provides a new insight into GV oocyte structure and function during folliculogenesis while challenging current concepts about oocyte quality criteria based on the GV morphology. This suggests alternative evaluative approaches for oocytes from other species too, including humans. Cat GVs also appear competent at an early follicle stage and are resilient to perturbations which designate this organelle as an attractive target for developing novel fertility preservation tactics. en
dc.relation.ispartof Human Reproduction en
dc.title The competence of germinal vesicle oocytes is unrelated to nuclear chromatin configuration and strictly depends on cytoplasmic quantity and quality in the cat model en
dc.type Journal Article en
dc.identifier.srbnumber 101488
dc.identifier.doi 10.1093/humrep/der176
rft.jtitle Human Reproduction
rft.volume 26
rft.issue 8
rft.spage 2165
rft.epage 2177
dc.description.SIUnit NZP en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 2165
dc.citation.epage 2177


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