Activation of the intronic cryptic 5' splice site depends on its distance to the upstream cassette exon
Activation of the intronic cryptic 5' splice site depends on its distance to the upstream cassette exon
复制标题
内含子隐秘 5' 剪接位点的激活取决于其与上游盒式外显子的距离
DOI：
10.1016/j.gene.2017.03.023
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发表时间：
2017
期刊：
影响因子：
3.5
通讯作者：
Zhang Y.
中科院分区：
文献类型：
--
作者：
Liu W.;Li X.;Liao S.;Dou K.;Zhang Y.
Splice site selection is a key step that determines the mRNA isoforms generated from a single transcript. The large diversity in splice site sequences emphasizes the plasticity of splice site recognition and selection. In this report, a cell-based reporter system using aSMN1/2cassette exon was applied to study the roles governing the activation of a cryptic 5′SS from the intron 4 of theCT/CGRPgene. We found that the cryptic site was activated when placed within 124 nt downstream the cassette exon, and the level of activation was negatively correlated with its distance from the exon. In addition, activation was not affected by PTB but was eliminated by an insertion extending the exon length. Activated cryptic 5′SSs in intron or exon could override the original alternative 5′SS, obeying the U1 base-pairing rule. These results suggest that the exon length itself could represent a factor in determining the splice site selection.
