在Neurospora crassa中,对表观基因组稳定性需要基因组脱酶-1
Felicia Ebot-Ojong1, Aileen R Ferraro1, Farh Kaddar2
1Department of Microbiology, University of Georgia, Athens, GA, 30602 USA.
bioRxiv : the preprint server for biology
|February 3, 2025
概括
基因组脱乙酶1 (HDA-1) 对于维持Neurospora crassa的表观基因组稳定性至关重要. 它的缺失导致表观遗传标记的逐渐丧失和基因失调,突出显示HDA-1的存在.
科学领域:
- 表观遗传学和染色质调节
- 分子生物学分子生物学
- 菌类遗传学 菌类遗传学
背景情况:
- 聚合物抑制复合物2 (PRC2) 通过素H3氨酸27三甲基化 (H3K27me3) 建立抑制色素.
- 基因组脱乙酶 (HDACs) 参与维持异染色素和PcG抑制的染色素,但它们的具体作用尚不清楚.
- 在 *Neurospora crassa* 中,H3K27me3 沉积涉及ASH1 和异染色素组件,如HP1.1.
研究的目的:
- 识别用于抑制聚合组 (PcG) 基因的必不可少的基因组脱甲基酶 (HDACs).
- 阐明 HISTONE DEACETYLASE-1 (HDA-1) 在 H3K27me3 沉积和表观基因组稳定中的作用.
主要方法:
- 基因查以确定所需的HDACs.
- 在野生型和突变菌株中分析基因修饰 (H3K27me3,H3K9me3) 和基因表达.
- 实验室进化实验评估 *hda-1* 删除的长期影响.
主要成果:
- HDA-1的丧失导致PRC2-甲基化基因的激活和H3K27me3.3的耗尽.
- 由于HDA-1缺乏,导致H3K9me3的减少,过度乙化和异常的H3K27me3 / H3K36me3在构成性异质染色素中的丰富.
- 染色域蛋白-2 (CDP-2) 对于HDA-1向和正常的H3K27me3模式是必要的.
- 删除*hda-1*会导致随着时间的推移进步的表观基因组衰变.
结论:
- HDA-1对于维持H3K27me3模式和PcG标的转录抑制至关重要.
- 在调节表观基因组稳定性和防止N. crassa*逐渐衰变方面,HDA-1起着至关重要的作用.
- 为了确保表观遗传完整性,HDA-1与CDP-2等异染色素成分协同工作.
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