将马传染性贫血病毒驴强毒(donkey adaptedequineinfectiousanemiavirus,D AEIAV)、马传染性贫血病毒驴白细胞弱毒(donkeyleukocyteattenuatedEIAV,DLAEIAV)及EIAVWyoming株的全长长末端重复序列(LTR)分别克隆到报告基因载体pCAT Basicvector中,获得重组质粒p D A LTR CAT、p DLA LTR CAT及p Wyo LTR CAT。将这3个重组质粒分别体外转染EIAV阴性健康驴的白细胞,比较这三者LTR启动报告基因CAT表达的基础活性和在tat pcDNA3共转染条件下激活活性的差异。结果表明:在驴白细胞中,DLAEIAVLTR启动CAT表达的活性略高于D AEIAVLTR;而与EIAVWyoming株LTR比较,DLAEIAV与D AEIAV二者LTR启动CAT表达的活性都较低。在有共转染重组表达质粒tat pcDNA3条件下,D AEIAV、DLAEIAV及EIAVWyoming株LTR起始CAT表达的活性都得到提高,分别提高了4 8倍、6 0倍和3 2倍。上述结果提示,LTR可能是体现DLAEI...
【英文摘要】
The long terminal repeats(LTRs)of donkey-adapted EIAV(D-A EIAV),donkey leukocyte attenuated EIAV(DLA EIAV)and EIAV strain Wyoming were separately cloned into pCAT-Basic vector,and the generated recombinant plasmids were designated as p-D-A-LTR-CAT,p-DLA-LTR-CAT and p-Wyo-LTR-CATThe promoting activities of three LTRs were comparatively studied in donkey leukocyte by driving chloroamphenicol acetyltransferase(CAT)expressionThe results indicated that the promo...
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