Incorporation of the histone variant H2A.Z counteracts gene silencing mediated by H3K27 trimethylation in Fusarium fujikuroi

IF 4.2 2区 生物学 Q1 GENETICS & HEREDITY
Anna K. Atanasoff-Kardjalieff, Harald Berger, Katharina Steinert, Slavica Janevska, Nadia Ponts, Hans-Ulrich Humpf, Svetlana Kalinina, Lena Studt-Reinhold
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引用次数: 0

Abstract

Fusarium fujikuroi is a pathogen of rice causing diverse disease symptoms such as ‘bakanae’ or stunting, most likely due to the production of various natural products (NPs) during infection. Fusaria have the genetic potential to synthesize a plethora of these compounds with often diverse bioactivity. The capability to synthesize NPs exceeds the number of those being produced by far, implying a gene regulatory network decisive to induce production. One such regulatory layer is the chromatin structure and chromatin-based modifications associated with it. One prominent example is the exchange of histones against histone variants such as the H2A variant H2A.Z. Though H2A.Z already is well studied in several model organisms, its regulatory functions are not well understood. Here, we used F. fujikuroi as a model to explore the role of the prominent histone variant FfH2A.Z in gene expression within euchromatin and facultative heterochromatin. Through the combination of diverse ‘-omics‘ methods, we show the global distribution of FfH2A.Z and analyze putative crosstalks between the histone variant and two prominent histone marks, i.e., H3K4me3 and H3K27me3, important for active gene transcription and silencing, respectively. We demonstrate that, if FfH2A.Z is positioned at the + 1-nucleosome, it poises chromatin for gene transcription, also within facultative heterochromatin. Lastly, functional characterization of FfH2A.Z overexpression and depletion mutants revealed that FfH2A.Z is important for wild type-like fungal development and secondary metabolism. In this study, we show that the histone variant FfH2A.Z is a mark of positive gene transcription and acts independently of the chromatin state most likely through the stabilization of the + 1-nucleosome. Furthermore, we demonstrate that FfH2A.Z depletion does not influence the establishment of both H3K27me3 and H3K4me3, thus indicating no crosstalk between FfH2A.Z and both histone marks. These results highlight the manifold functions of the histone variant FfH2A.Z in the phytopathogen F. fujikuroi, which are distinct regarding gene transcription and crosstalk with the two prominent histone marks H3K27me3 and H3K4me3, as proposed for other model organisms.
在 Fusarium fujikuroi 中,组蛋白变体 H2A.Z 的整合抵消了由 H3K27 三甲基化介导的基因沉默
Fusarium fujikuroi 是水稻的一种病原菌,可引起多种病害症状,如 "bakanae "或发育不良,这很可能是由于在感染过程中产生了各种天然产物(NPs)。镰刀菌具有合成大量具有不同生物活性的此类化合物的遗传潜力。合成 NPs 的能力远远超过所产生的 NPs 数量,这意味着基因调控网络对诱导产生 NPs 起着决定性作用。其中一个调控层就是染色质结构和与之相关的染色质修饰。其中一个突出的例子是组蛋白与组蛋白变体(如 H2A 变体 H2A.Z)的交换。虽然 H2A.Z 已经在多个模式生物中得到了深入研究,但其调控功能还不甚明了。在这里,我们以富士黑蝇为模型,探讨了突出的组蛋白变体 FfH2A.Z 在异染色质和变异异染色质内基因表达中的作用。通过结合多种 "组学 "方法,我们展示了FfH2A.Z的全球分布,并分析了该组蛋白变体与两个显著组蛋白标记(即H3K4me3和H3K27me3)之间的潜在交叉关系,这两个标记分别对活跃的基因转录和沉默非常重要。我们证明,如果 FfH2A.Z 位于 + 1 核小体上,它就能使染色质为基因转录做好准备,同样也是在变异异染色质中。最后,FfH2A.Z过表达和缺失突变体的功能表征显示,FfH2A.Z对野生型真菌的发育和次生代谢非常重要。在这项研究中,我们发现组蛋白变体 FfH2A.Z 是正基因转录的标志,其作用独立于染色质状态,很可能是通过稳定 + 1 核小体。此外,我们还证明,FfH2A.Z 的缺失不会影响 H3K27me3 和 H3K4me3 的建立,从而表明 FfH2A.Z 与这两种组蛋白标记之间没有串扰。这些结果凸显了组蛋白变体 FfH2A.Z 在植物病原菌 F. fujikuroi 中的多重功能,它们在基因转录和与两个重要的组蛋白标记 H3K27me3 和 H3K4me3 之间的串扰方面各不相同,这一点在其他模式生物中也得到了证实。
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来源期刊
Epigenetics & Chromatin
Epigenetics & Chromatin GENETICS & HEREDITY-
CiteScore
7.00
自引率
0.00%
发文量
35
审稿时长
1 months
期刊介绍: Epigenetics & Chromatin is a peer-reviewed, open access, online journal that publishes research, and reviews, providing novel insights into epigenetic inheritance and chromatin-based interactions. The journal aims to understand how gene and chromosomal elements are regulated and their activities maintained during processes such as cell division, differentiation and environmental alteration.
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