Uncovering Regulators of Heterochromatin Mediated Silencing Using a Zebrafish Transgenic Reporter.

Uncovering Regulators of Heterochromatin Mediated Silencing Using a Zebrafish Transgenic Reporter.
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DOI:
10.3389/fcell.2022.832461
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发表时间:
2022
影响因子:
5.5
通讯作者:
Goll MG
Goll MG
中科院分区:
生物学2区
文献类型:
--
作者:
Calvird AE;Broniec MN;Duval KL;Higgs AN;Arora V;Ha LN;Schouten EB;Crippen AR;McGrail M;Laue K;Goll MG

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异染色质的形成和维持是抑制重复序列转录的关键。然而,在脊椎动物发育的背景下,缺乏监测异染色质介导的重复序列抑制的体内工具。在这里,我们证明了在无所不在的启动子控制下,包含dsRed荧光报告基因的大型串联转基因整合再现了异染色质沉默的分子特征,并且转基因阵列的表达可以通过耗尽已知的异染色质调节因子而重新激活。然后,我们使用该报告基因来鉴定斑马鱼NSD1同源基因Nsd1a和Nsd1b在促进异染色质介导的抑制中的作用。我们的结果提供了原理证明,这种转基因报告系可用于快速鉴定在活的脊椎动物生物背景下具有异色沉默潜在作用的基因。
Heterochromatin formation and maintenance is critical for the repression of transcription from repetitive sequences. However, in vivo tools for monitoring heterochromatin mediated repression of repeats in the context of vertebrate development have been lacking. Here we demonstrate that a large concatemeric transgene integration containing the dsRed fluorescent reporter under the control of a ubiquitous promoter recapitulates molecular hallmarks of heterochromatic silencing, and that expression from the transgene array can be reactivated by depletion of known regulators of heterochromatin. We then use this reporter to identify a previously unappreciated role for the zebrafish NSD1 orthologs, Nsd1a and Nsd1b, in promoting heterochromatin mediated repression. Our results provide proof-principle that this transgenic reporter line can be used to rapidly identify genes with potential roles in heterochromatic silencing in the context of a live, vertebrate organism.
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