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Localization and expression of U1 RNA in early mouse embryo development☆

机译:小鼠早期胚胎发育中U1 RNA的定位与表达☆

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摘要

WehavestudiedtheaccumulationandlocalizationofU1RNAduringmouseembryodevelopmentbyinsituhybridizationwithaU1RNAprobeandimmunofluorescencemicroscopyusingamousemonoclonalantibodytoU1snRNP.ThereisasubstantialamountofU1RNApresentintheoocytethatispresentinboththegerminalvesicleandthecytoplasmalthoughtheconcentrationishigherinthenuclearcompartment.Followingthegerminalvesiclebreakdownthataccompaniesovulationandmeioticmaturation,theU1RNAisuniformlydistributedthroughouttheunfertilizedoocyte.Inthefertilizedegg,thesilvergraindensityfrominsituhybridizationishigheroverpronucleiandthisenrichmentismaintainedatthetwo-cellandlaterstages.SimilarresultswereobtainedforthedistributionoftheU1snRNPasassayedbyimmunofluorescencemicroscopy:U1RNAispredominantlylocalizedinallnucleiexceptpolarbodynuclei.TheU1RNAintheoocyteandtwo-cellembryoispredominantly(&85%)U1aRNA.Bytheeight-cellstagethereisatwotothree-foldincreaseintheamountoftotalU1RNAandtheproportionofU1bRNAhasincreasedtoabout40%.TheamountofU1RNAcontinuestoincreasethroughtheblastocyststageandtheproportionoftheU1bRNAincreasesto60%.
机译:WehavestudiedtheaccumulationandlocalizationofU1RNAduringmouseembryodevelopmentbyinsituhybridizationwithaU1RNAprobeandimmunofluorescencemicroscopyusingamousemonoclonalantibodytoU1snRNP.ThereisasubstantialamountofU1RNApresentintheoocytethatispresentinboththegerminalvesicleandthecytoplasmalthoughtheconcentrationishigherinthenuclearcompartment.Followingthegerminalvesiclebreakdownthataccompaniesovulationandmeioticmaturation,theU1RNAisuniformlydistributedthroughouttheunfertilizedoocyte.Inthefertilizedegg,thesilvergraindensityfrominsituhybridizationishigheroverpronucleiandthisenrichmentismaintainedatthetwo-cellandlaterstages.SimilarresultswereobtainedforthedistributionoftheU1snRNPasassayedbyimmunofluorescencemicroscopy:U1RNAispredominantlylocalizedinallnucleiexceptpolarbodynuclei.TheU1RNAintheoocyteandtwo-cellembryoispredominantly(大于85%)U1aRNA.Bytheeight-cellstagethereisatwotothree-foldincreaseintheamountoftotalU1RNAandtheproportionofU1bRNAhasincreasedtoabout40%.TheamountofU1RNAcontinuestoi在胚泡期增加,U1b RNA的比例增加60%。

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