染色体重塑蛋白BPTF在平面干细胞中的基因促进器中调解染色体的可访问性
Prince Verma1, John M Allen1, Alejandro Sánchez Alvarado2
1Department of Biology, University of Kentucky, Lexington, KY, USA.
BMC genomics
|March 12, 2025
概括
原PHD指蛋白 (BPTF) 对于维持平面干细胞中的染色质可访问性至关重要,影响基因调节. 失去BPTF会影响促进体的可访问性,特别是对由Set1依赖的H3K4me3标记的基因,这揭示了它在干细胞稳态中的作用.
科学领域:
- 表观遗传学和基因调控
- 干细胞生物学 干细胞生物学
- 发展生物学 发展生物学
背景情况:
- 染色体可访问性调节对于真核生物中精确的基因表达至关重要.
- 染色体重塑蛋白的突变,如BPTF/NURF301,与发育障碍和癌症有关.
- BPTF优先结合H3K4me3,指导核细胞重塑因子 (NuRF) 复杂活性,但其体内招募机制需要进一步研究.
研究的目的:
- 调查BPTF在维持平面动物 (Schmidtea mediterranea) 染色质可访问性和干细胞功能中的作用.
- 了解BPTF如何影响生物体环境中的基因表达.
- 在平面干细胞中识别由BPTF调节的特定基因位点.
主要方法:
- 使用敲击技术耗尽平面BPTF.
- 对基因促进物,特别是转录起始点 (TSSs) 附近的染色质可访问性的分析.
- 可访问性变化与基因表达的相关性,特别是检查H3K4me3标记的影响 (Set1依赖与MLL1/2-依赖).
主要成果:
- 平面BPTF枯竭主要影响TSS附近的基因促进体的染色质可访问性.
- 失去BPTF-依赖的可访问性并不普遍与基因表达的减少相关.
- 标记为Set1依赖的H3K4me3的基因对BPTF损失的敏感性增加,与标记为MLL1/2-依赖的H3K4me3.3的基因不同.
- 平面BPTF的敲击 (Smed-bptf) 复制了Smed-set1敲击的效果.
结论:
- SMED-BPTF对于平面组织恒温是必不可少的,可能是通过维持干细胞中特定基因促进者的染色质可访问性.
- 对BPTF枯竭敏感的基因位点的识别为干细胞生物学提供了关键基因的洞察力.
- 这项研究阐明了BPTF在调节整个生物体内的染色质可访问性和基因表达中的体内功能.
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