Characterization of Rous sarcoma virus intronic sequences that negatively regulate splicing.
Characterization of Rous sarcoma virus intronic sequences that negatively regulate splicing.
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负调控剪接的劳斯肉瘤病毒内含子序列的表征。
DOI：
10.1016/0042-6822(91)90758-4
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发表时间：
1991
期刊：
影响因子：
3.7
通讯作者：
Beemon,K
中科院分区：
文献类型：
--
作者：
McNally,MT;Gontarek,RR;Beemon,K
Retroviruses splice only a fraction of their primary RNA transcripts to subgenomic mRNA. The unspliced RNA is transported to the cytoplasm, where it serves as genomic RNA as well as mRNA for thegagandpolgenes. Deletion of sequences from the Rous sarcoma virusgaggene, which is part of the intron of the subgenomic mRNAs, was previously observed to result in an increase in the ratio of spliced to unspliced RNA. These sequences, which we termed a negative regulator of splicing (NRS), can be moved to the intron of a heterologous gene resulting in an accumulation of unspliced RNA in the nucleus. We have used such constructs, assayed by transient expression in chicken embryo fibroblasts, to define the minimal sequences necessary to inhibit splicing. Maximal NRS activity was observed with a 300-nt fragment containing RSV nts 707–1006; two noncontiguous domains within this fragment, one of which contains a polypyrimidine tract, were both found to be essential. The NRS element was active exclusively in the sense orientation in two heterologous introns tested and in both avian and mammalian cells. Position dependence was also observed, with highest activity when the NRS was inserted in the intron near the 5′ splice site. The NRS element was also active at an exon position 136 nts upstream of the 5′ splice site but not at sites further upstream. In addition, it did not affect the splicing of a downstream intron.
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作者：
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