Intronization enhances expression of S-protein and other transgenes challenged by cryptic splicing
Intronization enhances expression of S-protein and other transgenes challenged by cryptic splicing
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内含化增强了 S 蛋白和其他受隐性剪接挑战的转基因的表达
DOI:
10.1101/2021.09.15.460454
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Tomberg K
中科院分区:
文献类型:
--
作者:
Tomberg K
The natural habitat of SARS-CoV-2 is the cytoplasm of a mammalian cell where it replicates its genome and expresses its proteins. While SARS-CoV-2 genes and hence its codons are presumably well optimized for mammalian protein translation, they have not been sequence optimized for nuclear expression. The cDNA of the Spike protein harbors over a hundred predicted splice sites and produces mostly aberrant mRNA transcripts when expressed in the nucleus. While different codon optimization strategies increase the proportion of full-length mRNA, they do not directly address the underlying splicing issue with commonly detected cryptic splicing events hindering the full expression potential. Similar splicing characteristics were also observed in other transgenes. By inserting multiple short introns throughout different transgenes, significant improvement in expression was achieved, including >7-fold increase for Spike transgene. Provision of a more natural genomic landscape offers a novel way to achieve multi-fold improvement in transgene expression.
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