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Mutational Insertion of a ROSA26–EGFP Transgene Leads to Defects in Spermiogenesis and Male Infertility in Mice

机译:ROSA26– EGFP转基因的突变插入导致小鼠精子发生和男性不育的缺陷。

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Pronuclearinjectionhasbeenasuccessfulstrategyforgeneratinggeneticallyengineeredmousemodelstobetterunderstandthefunctionalityofgenes.Acharacteristicofpronuclearinjectionisthatrandomintegrationofthetransgeneintothegenomecandisturbafunctionalgeneandresultinaphenotypeunrelatedtothetransgeneitself.Inthisstudy,wehavecharacterizedamousemodelcontaininganinsertionalmutationthat,inthehomozygousstate,severelyaffectsspermatogenesisascharacterizedbylackofspermmotilityandacrosomalaplasia.Whereashomozygousfemalemicehadnormalfertility,malemicehomozygousfortheinsertionalmutationwereunabletoproducepupsbynaturalmatingwitheitherhomozygousorwild-typefemalemice.Nofertilizedembryoswereproducedbymatingstohomozygousmalemice,andnospermwerepresentinthereproductivetractofmatedfemalemice.Spermatozoaisolatedfromhomozygousmalemiceexhibitedheadandmidpiecedefects,butnomajordefectsintheprincipalpieceofthesesperm.HistologicexaminationandimmunohistochemicalstainingofthetestesrevealedvacuolardegenerationofSertolicellsandlossofstructuralseminiferoustubuleintegrityandorganization,indicatingthatspermatogenesisisseverelyaffectedinthismousemodel.Althoughthemalesarealwaysinfertile,theseverityofthehistologicandspermmorphologicdefectsappearedtobeage-related.
机译:Pronuclearinjectionhasbeenasuccessfulstrategyforgeneratinggeneticallyengineeredmousemodelstobetterunderstandthefunctionalityofgenes.Acharacteristicofpronuclearinjectionisthatrandomintegrationofthetransgeneintothegenomecandisturbafunctionalgeneandresultinaphenotypeunrelatedtothetransgeneitself.Inthisstudy,wehavecharacterizedamousemodelcontaininganinsertionalmutationthat,inthehomozygousstate,severelyaffectsspermatogenesisascharacterizedbylackofspermmotilityandacrosomalaplasia.Whereashomozygousfemalemicehadnormalfertility,malemicehomozygousfortheinsertionalmutationwereunabletoproducepupsbynaturalmatingwitheitherhomozygousorwild-typefemalemice.Nofertilizedembryoswereproducedbymatingstohomozygousmalemice,andnospermwerepresentinthereproductivetractofmatedfemalemice.Spermatozoaisolatedfromhomozygousmalemiceexhibitedheadandmidpiecedefects,butnomajordefectsintheprincipalpieceofthesesperm.HistologicexaminationandimmunohistochemicalstainingofthetestesrevealedvacuolardegenerationofSertolicellsandl结构性有孔小管的完整性和组织性,表明这种小鼠模型的生精能力受到严重影响。尽管雄性不育,但组织学和精子形态学缺陷的严重性似乎与衰老有关。

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