Polycomb Repressive Complex 2 attenuates the very high expression of the Arabidopsis gene NRT2.1.

Polycomb Repressive Complex 2 attenuates the very high expression of the Arabidopsis gene NRT2.1.
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DOI:
10.1038/s41598-018-26349-w
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发表时间:
2018-05-21
期刊:
影响因子:
4.6
通讯作者:
Martin A
Martin A
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bellegarde F;Herbert L;Séré D;Caillieux E;Boucherez J;Fizames C;Roudier F;Gojon A;Martin A

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PrC2是真核生物基因表达的主要调控因子。它催化抑制染色质标记H3K27me3,从而导致靶基因的表达非常低。NRT2.1是H3K27me3的靶标,编码拟南芥中的一个关键的根硝酸盐转运蛋白,但PRC2在NRT2.1上的功能尚不清楚。在这里,我们证明了PRC2直接靶向和下调NRT2.1,但在非常高转录的背景下,在营养条件下,该基因是转录组中表达最高的基因之一。事实上,编码PRC2亚基的CLF的突变导致NRT2.1处H3K27me3的丢失,并仅在NRT2.1允许的条件下导致NRT2.1表达的进一步增加,特别是在NRT2.1正常表达的组织中。因此,我们的数据表明,PRC2在非常强的转录背景下缓和了NRT2.1的过度活动。这揭示了PRC2在控制拟南芥中一个高表达基因的表达方面的原始功能。
PRC2 is a major regulator of gene expression in eukaryotes. It catalyzes the repressive chromatin mark H3K27me3, which leads to very low expression of target genes. NRT2.1, which encodes a key root nitrate transporter in Arabidopsis, is targeted by H3K27me3, but the function of PRC2 on NRT2.1 remains unclear. Here, we demonstrate that PRC2 directly targets and down-regulates NRT2.1, but in a context of very high transcription, in nutritional conditions where this gene is one of the most highly expressed genes in the transcriptome. Indeed, the mutation of CLF, which encodes a PRC2 subunit, leads to a loss of H3K27me3 at NRT2.1 and results, exclusively under permissive conditions for NRT2.1, in a further increase in NRT2.1 expression, and specifically in tissues where NRT2.1 is normally expressed. Therefore, our data indicates that PRC2 tempers the hyperactivity of NRT2.1 in a context of very strong transcription. This reveals an original function of PRC2 in the control of the expression of a highly expressed gene in Arabidopsis.
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