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Identification and characterization of new plant microRNAs using EST analysis

机译:利用EST分析鉴定和鉴定新植物microRNA

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Seventy-five previously known plant microRNAs (miRNAs) were classified into 14 families according to their gene sequence identity. A total of 18,694 plant expressed sequence tags (EST) were found in the GenBank EST databases by comparing all previously known Arabidopsis miRNAs to GenBank's plant EST databases with BLAST algorithms. After removing the EST sequences with high numbers (more than 2) of mismatched nucleotides, a total of 812 EST contigs were identified. After predicting and scoring the RNA secondary structure of the 812 EST sequences using mFold software, 338 new potential miRNAs were identified in 60 plant species. miRNAs are widespread. Some microRNAs may highly conserve in the plant kingdom, and they may have the same ancestor in veryearly evolution. There is no nucleotide substitution in most miRNAs among many plant species. Some of the new identified potential miRNAs may be induced and regulated by environmental biotic and abiotic stresses. Some may be preferentially expressed inspecific tissues, and are regulated by developmental switching. These findings suggest that EST analysis is a good alternative strategy for identifying new miRNA candidates, their targets, and other genes. A large number of miRNAs exist in different plant species and play important roles in plant developmental switching and plant responses to environmental abiotic and biotic stresses as well as signal transduction. Environmental stresses and developmental switching may be the signals for synthesis and regulation of miRNAs in plants. A model for miRNA induction and expression, and gene regulation by miRNA is hypothesized.
机译:根据它们的基因序列同一性,将75种先前已知的植物microRNA(miRNA)分为14个家族。通过使用BLAST算法将以前已知的所有拟南芥miRNAs与GenBank的植物EST数据库进行比较,在GenBank EST数据库中总共发现了18694个植物表达的序列标签。在去除具有大量(超过2个)错配核苷酸的EST序列后,共鉴定出812个EST重叠群。使用mFold软件预测812 EST序列的RNA二级结构并对其进行评分后,在60种植物中鉴定出338种新的潜在miRNA。 miRNA广泛存在。一些microRNA在植物界可能非常保守,它们在早期进化中可能具有相同的祖先。在许多植物物种中,大多数miRNA中没有核苷酸取代。一些新发现的潜在的miRNA可能是由环境生物和非生物胁迫诱导和调控的。一些可能优先在特定组织中表达,并受发育转换的调节。这些发现表明,EST分析是鉴定新的miRNA候选物,其靶标和其他基因的良好替代策略。大量的miRNA存在于不同的植物物种中,并在植物发育转换,植物对环境非生物和生物胁迫以及信号转导的响应中发挥重要作用。环境胁迫和发育转换可能是植物中miRNA合成和调控的信号。假设了miRNA诱导和表达以及miRNA基因调控的模型。

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