与UGT73C6基因重叠的长非编码天然反义转录本(lncNATs)的表达水平影响拟南芥的莲座大小

天然反义长非编码RNA(lncNAT)参与植物基因表达的调控,调节不同的相关发育过程和对各种刺激的反应。

我们在拟南芥中鉴定并鉴定了两个lncNAT(NAT1UGT73C6和NAT2UGT73C6,统称为NATsUGT73C6),这些基因是从基因UGT73C6(属于UDP-糖基转移酶(UGTs)基因的UGT73C亚家族的成员)转录的。两种NATsUGT73C6的表达均受发育控制,并且独立于UGT73C6在顺式中的转录而发生。

通过人工microRNA下调NATsUGT73C6的水平会导致连莲座叶面积的减少,而NAT1UGT73C6或NAT2UGT73C6的组成型过表达会导致相反的表型,从而导致花环的大小增加。

NATsUGT73C6的这种活性依赖于其RNA序列,尽管不能排除对UGT73C6的顺式调节,但观察到的表型不是UGT73C6反式调节的结果。

NATsUGT73C6水平显示影响细胞增殖,从而影响单个叶片的大小。与此概念一致,我们的数据表明NATsUGT73C6通过调节细胞增殖来调节参与调节叶片生长的关键转录因子的表达水平。

因此,这些发现揭示了叶片生长过程中的另一个调控层。

Natural antisense long noncoding RNAs (lncNATs) are involved in the regulation of gene expression in plants, modulating different relevant developmental processes and responses to various stimuli. We identified and characterized two lncNATs (NAT1UGT73C6 and NAT2UGT73C6, collectively NATsUGT73C6) in Arabidopsis thaliana that are transcribed from a gene overlapping UGT73C6, a member of the UGT73C subfamily of genes encoding UDP-glycosyltransferases (UGTs). Expression of both NATsUGT73C6 is developmentally controlled and occurs independently of the transcription of UGT73C6 in cis. Downregulation of NATsUGT73C6 levels through artificial microRNAs results in a reduction of the rosette area, while constitutive overexpression of NAT1UGT73C6 or NAT2UGT73C6 leads to the opposite phenotype, an increase in rosette size. This activity of NATsUGT73C6 relies on its RNA sequence, and, although modulation of UGT73C6 in cis cannot be excluded, the observed phenotypes are not a consequence of the regulation of UGT73C6 in trans. The NATsUGT73C6 levels were shown to affect cell proliferation and thus individual leaf size. Consistent with this concept, our data suggest that the NATsUGT73C6 modulate the expression levels of key transcription factors involved in regulating leaf growth by modulating cell proliferation. These findings thus reveal an additional regulatory layer on the process of leaf growth.

doi: https://doi.org/10.1101/2021.03.01.433436

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