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首页> 外文期刊>Endocrinology >The alternative noncoding exons 1 of aromatase (Cyp19) gene modulate gene expression in a posttranscriptional manner.
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The alternative noncoding exons 1 of aromatase (Cyp19) gene modulate gene expression in a posttranscriptional manner.

机译:芳香酶(Cyp19)基因的替代性非编码外显子1以转录后方式调节基因表达。

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Aromatase (Cyp19) is a key enzyme in estrogen biosynthesis and an important target in endocrine therapy for estrogen receptor (ER)-positive postmenopausal breast cancer. Aromatase transcription is driven by multiple tissue-specific promoters, which result in the production of various mRNA transcripts that contain an alternative noncoding exon 1 followed by a common protein-coding region. Transcriptional activity of these promoters is the only known determinant for aromatase protein abundance in a given tissue or cellular context. To determine whether aromatase expression could be influenced by additional regulatory mechanisms, we used a common heterologous promoter to drive the expression of multiple aromatase cDNA sequences that differ only by the alternative exon 1 sequence. These expression vectors gave rise to vastly different levels of aromatase mRNA and protein in multiple cell lines examined. Furthermore, the relative abundance of several mRNA variants did not correlate with that of the corresponding protein product. The variation in mRNA and protein levels is most likely due to a negative effect of certain alternative exons 1 on RNA stability and protein translation. Deletional analyses indicate that the 5' regions of the adipose tissue-specific exons I.3 and I.4 contain the cis-acting elements responsible for modulation of aromatase levels. Thus, our work uncovers an important role of the alternative exons 1 in posttranscriptional regulation of aromatase gene expression.
机译:芳香酶(Cyp19)是雌激素生物合成中的关键酶,并且是绝经后雌激素受体(ER)阳性乳腺癌的内分泌治疗的重要目标。芳香酶转录是由多个组织特异性启动子驱动的,从而导致产生各种mRNA转录本,这些转录本包含一个替代的非编码外显子1,然后是一个共同的蛋白质编码区。这些启动子的转录活性是在给定的组织或细胞环境中芳香酶蛋白质丰度的唯一已知决定因素。为了确定芳香酶的表达是否会受到其他调控机制的影响,我们使用了一个常见的异源启动子来驱动多个芳香酶cDNA序列的表达,这些序列仅在其他外显子1序列上有所不同。这些表达载体在所检查的多个细胞系中产生了不同水平的芳香酶mRNA和蛋白质。此外,几种mRNA变体的相对丰度与相应蛋白质产物的相对丰度不相关。由于某些替代外显子1对RNA稳定性和蛋白质翻译的负面影响,最有可能导致mRNA和蛋白质水平的变化。理想的分析表明,脂肪组织特异性外显子I.3和I.4的5'区含有负责调节芳香化酶水平的顺式作用元件。因此,我们的工作揭示了替代外显子1在芳香酶基因表达的转录后调控中的重要作用。

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