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Heterochromatic Silencing and HP1 Localization in Drosophila Are Dependent on the RNAi Machinery

机译:果蝇中的异色沉默和HP1定位取决于RNAi机制。

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摘要

Genes normally resident in euchromatic domains are silenced when packaged into heterochromatin, as exemplified in Drosophila melanogaster by position effect variegation (PEV). Loss-of-function mutations resulting in suppression of PEV have identified critical components of heterochromatin, including proteins HP1, HP2, and histone H3 lysine 9 methyltransferase. Here, we demonstrate that this silencing is dependent on the RNA interference machinery, using tandem mini-white arrays and white transgenes in heterochromatin to show loss of silencing as a result of mutations in piwi, aubergine, or spindle-E (homeless), which encode RNAi components. These mutations result in reduction of H3 Lys methylation and delocalization of HP1 and HP2, most dramatically in spindle-E mutants.
机译:当包装到异染色质中时,通常驻留在常染色体结构域中的基因被沉默,如果蝇中的果蝇通过位置效应杂色法(PEV)所示。导致PEV受抑制的功能丧失突变已鉴定出异染色质的关键成分,包括蛋白质HP1,HP2和组蛋白H3赖氨酸9甲基转移酶。在这里,我们证明这种沉默依赖于RNA干扰机制,使用异染色质中的串联微型白色阵列和白色转基因来显示由于piwi,茄子或梭形E(无家可归)突变而导致的沉默丧失。编码RNAi成分。这些突变导致H3 Lys甲基化的减少以及HP1和HP2的脱域,这在纺锤体E突变体中最为明显。

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