不同构架的5\'端mRNA序列对转录本稳定性和翻译效率的影响
首发时间:2024-03-14
摘要:5\'非翻译区(5\'-UTR)和N端编码序列(NCS)通过影响mRNA的降解和翻译,显著影响基因的表达。核糖体对Shine-Dalgarno (SD)序列的识别受到5\'-UTR和NCS结构的影响,表明不同调控区域之间存在相互作用。本研究建立了一个转录后调控序列(576个变体)的合成文库,以评估它们对mRNA降解和翻译的影响。每个序列由5\'-UTR、SD序列和NCS这三个元件组成,每个元件突变体都具有不同的序列和结构。我们使用FlowSeq技术根据荧光强度对转录后调控序列进行分类,然后进行高通量测序。此外,cDNA测序量化了转录本丰度,建立了转录后调控序列与mRNA稳定性之间的关系。我们的研究结果表明,非结构化的5\'- UTR平均提高了47%的蛋白表达,而没有显著影响转录本的丰度;最优的茎环5\'- UTR(茎长10-12 nt,环长4 nt)与非结构化的转录本丰度相比,转录物丰度提高了43%-90%,从而提高了蛋白质产量。高度保守的SD序列提高了转录本丰度和蛋白质产量;非结构化NCS对蛋白质和转录本水平均有积极影响,分别增加42%和27%。这些发现强调了在设计转录后调控序列(PTRCs)以优化基因表达时结构考虑的重要性,强调了关注mRNA稳定性和翻译效率的策略。重要的是,我们还将转录后调控序列的使用扩展到nrk和sam2基因。
关键词: 5\'非翻译区 N端编码序列 SD序列;翻译效率 转录本丰度。
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The impact of 5\' end mRNA sequences with different architectures on transcript stability and translation efficiency
Abstract:The 5\' untranslated region (5\'-UTR) and the N-terminal coding sequence (NCS) significantly influence gene expression, by affecting mRNA degradation and translation. The ribosome\'s recognition of the Shine-Dalgarno (SD) sequence is influenced by the structures of both the 5\'-UTR and NCS, indicating interactions among various regulatory regions. This study developed a synthetic library of post-transcriptional regulatory sequences (576 variants) to evaluate their effects on mRNA degradation and translation. Each sequence consists of three components, 5\'-UTR, SD sequence and NCS, with different sequences and structures.We classified the post-transcriptional regulatory sequences based on fluorescence intensity using FlowSeq technology,followed by high-throughput sequencing. Additionally, cDNA sequencing quantified transcript abundance, establishing the relationship between post-transcriptional regulatory sequences and mRNA stability. Our results demonstrated that unstructured 5\'-UTRs enhanced protein expression by an average of 47%, without significantly affecting transcript abundance; optimal stem-loop 5\'-UTRs (stem length of 10-12 nt and loop size of 4 nt) primarily increased transcript abundance by 43%-90% compared to unstructured ones, consequently enhancing protein production. Highly conserved RBS boosted both transcript abundance and protein production; unstructured NCSs exhibited a positive effect on both protein and transcript levels, increasing by 42% and 27%, respectively. These findings underscore the importance of structural considerations in designing post-transcriptional regulatory components (PTRCs) to optimize gene expression, highlighting strategies focusing on mRNA stability and translation efficiency. Importantly, we also extended the use of pos-transcriptional regulatory sequences to nrk and sam2 genes.
Keywords: 5\'-UTR NCS SD Translation efficiency Transcript abundance
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不同构架的5\'端mRNA序列对转录本稳定性和翻译效率的影响
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