转录因子克服了Polycomb相关甲基化在瘤中的压制性影响
bioRxiv : the preprint server for biology
|June 6, 2025
概括
大肠直肠癌 (CRC) 中的DNA甲基化变化并不总是使基因沉默. 尽管DNA高甲基化,但多标记基因可以保持活跃,这表明表观遗传可塑性驱动癌症的进展.
科学领域:
- 表观遗传学和基因组学
- 癌症生物学 癌症生物学
- 分子瘤学分子瘤学
背景情况:
- 基因甲基化是癌症中经常发生变化的关键表观遗传机制.
- 了解DNA甲基化动态如何影响癌症进展期间的基因表达是必不可少的.
- 大肠直肠癌 (CRC) 呈现出显著的表观遗传失调.
研究的目的:
- 为了研究DNA甲基化模式与结直肠癌中的基因表达之间的关系.
- 在结合的瘤和非瘤组织中绘制促进物甲基化和基因表达动态图.
- 阐明聚合组 (PcG) 占用在调解甲基化驱动的转录变化中的作用.
主要方法:
- 针对性的双硫酸盐测序来分析DNA甲基化.
- RNA测序 (RNA-seq) 用于评估基因表达水平.
- 80名韩国结肠直肠癌患者的瘤和非瘤组织对的分析.
主要成果:
- 促进体甲基化模式显示了非瘤和瘤组织之间的动态转移.
- 基因甲基化中的变化与基因沉默或激活并不一致相关.
- 多标记 (PcG+) 促进体易发生高甲基化,但在瘤中经常保持转录活性,特别是转录因子 (TF) 基因.
- 非PcG标记 (PcG-) 促进体中的超甲基化与转录抑制的联系更为一致.
结论:
- PcG+ TF基因促进者的表观遗传可塑性可以克服结直肠癌中DNA甲基化抑制作用.
- 瘤可能利用这种可塑性来维持或增强关键调节基因的表达.
- 在确定结直肠瘤发生过程中DNA甲基化变化的功能影响时,PcG占用率至关重要.
相关概念视频
Epigenetic Regulation
3.7K
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
3.7K
Epigenetic Regulation
33.5K
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
33.5K
Abnormal Proliferation
5.1K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
5.1K
Combinatorial Gene Control
9.5K
Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
9.5K
Co-activators and Co-repressors
8.4K
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
8.4K
Co-activators and Co-repressors
3.0K
3.0K


