梅花鹿-牛异种体细胞核移植操作方法的研究
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摘要
本研究旨在对梅花鹿-牛异种体细胞核移植(Interspecies Somatic Cell Nuclear Transfer,ISCNT)的显微操作方法进行系统研究,从而优化其操作过程。以梅花鹿耳皮肤成纤维细胞为供核细胞,牛MⅡ期卵母细胞为受体,分别采用盲吸法、挤压法和脱羰秋水仙碱(Demecoline,DEME)化学辅助的方法去核,带下注射(Perivitelline Microinjection,PM)、Pizeo破膜细胞胞质内注射(Break-Menbrane-Cell Intracytoplasmic Microinjection,BMCIM)和全细胞胞质内注射(Whole-Cell Intracytoplasmic Microinjection,WCIM)的方法注核,带下注核的卵母细胞电融合后化学激活,其余方法注核后直接化学激活,重组胚用CR1aa培养液体外培养。结果表明:(1)DEME辅助法去核率最高,挤压法最低,三种去核方法的去核率差异显著(P<0.05),去核时间差异不显著(P>0.05);(2)PM组和WCIM组注核成功率分别为100%和94.8%,注核时间分别为31.0s和35.1 s,显著低于BMCIM法(P<0.05),但是注核成功率显著高于BMCIM法(P<0.05),而且两者差异不显著(P>0.05);(3)BMCIM组和WCIM组的激活率均显著高于PM组(P<0.05),其中一步法的BMCIM组最高,一步法和两步法在激活率、卵裂率和囊胚率方面均无显著差异(P>0.05)。结果提示:DEME辅助去核、Pizeo辅助破膜胞质内注射的一步法显微操作可有效用于梅花鹿-牛的异种体细胞核移植的研究。
The purpose of this study was to optimize the manipulation of interspecies somatic cell nuclear transfer(ISCNT) between sika deer and bovine.It was used the sika deer ear skin fibroblast as nuclear donor cell,and bovine M E oocyte as recipient.McGrath-Solter,extrusion and DEME chemically assisted methods were used in enucleation.Perivitelline microinjection(PM),break- membrane- cell intracytoplasmic microinjection(BMCIM)and whole- cell intracytoplasmic microinjection(WCIM) were used in nuclear injection.Oocytes were eleetrofusion after enucleation of PM before chemical activated and others were chemically activated without eleetrofusion.Reconstructed embryos were cultured in media of CRlaa.The results were shown that:(1) The rate of enucleation with the DEME method was the highest,and the rate of extrusion method was the lowest.There was significantly difference(P < 0.05) in the rate of enucleation among all the three enucleate methods,but not significantly difference(P > 0.05) in duration of enucleation.(2) The rate of nuclear injection by PM and WCIM was 100%and 94.8%separately,and the duration of nuclear injection by PM and WCIM was 31.0s and 35.Is separately.There was no difference between them(P> 0.05),their rate of nuclear injection were higher than which in BMCIM group(P <0.05),but duration of nuclear injection was converse(P >0.05).(3) The rate of activation by BMCIM and WCIM group were higher than it in PM group(P < 0.05),and which in BMCIM group of one- step method was the highest.There was no difference among the rate of rate of activation,cleavage and blastocyst between one- step and two- step method(P >0.05).The results suggest that one- step manipulative method of DEME assisted enucleation and pizeo assisted BMCIM was efficient in sika deer- bovine ISCNT.
引文
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