单细胞RNA-seq识别了延长的小鼠生殖系X染色体重激活动态,由PRC2-依赖机制指导
Yaqiong Liu1, Xianzhong Lau2, Prabhakaran Munusamy2
1King's College London, Centre for Gene Therapy and Regenerative Medicine, School of Basic & Medical Biosciences, Faculty of Life Sciences and Medicine, London, UK.
Developmental cell
|January 11, 2025
概括
女生殖细胞在发育过程中重新激活其沉默的X染色体. 这项研究追踪了X染色体活性化 (XCR) 动态,将其与表观遗传记忆和女性半转化联系起来.
科学领域:
- 发展生物学 发展生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 遗传学 遗传学 是一个
背景情况:
- 女性原始生殖细胞 (PGCs) 在重新编程过程中经历X染色体重新激活 (XCR).
- 在分子层面上,XCR的动力学和动态尚不清楚.
研究的目的:
- 精确评估从早期迁徙阶段到生殖腺发育的雌性生殖细胞中的XCR动态.
- 为了研究XCR,生殖细胞性二态和X染色体剂量补偿之间的时间联系.
- 探索表观遗传记忆和多抑制复合体2 (PRC2) 在XCR中的作用.
主要方法:
- 单细胞RNA测序的一个细胞.
- 染色素分析是为了确定染色体的形状.
- 在F1小鼠胚胎中对等基因特异性分析.
主要成果:
- 在胚胎日 (E) 9.5 PGC中,XCR开始微妙地增加,并逐渐增加,在E16.5 oogonia时达到平价.
- 从E10.5开始发生囊镇压,但由于PRC2活动,X失活的表观遗传记忆仍然存在.
- 在E13.5的活性化X染色体上不对称的基因素H3K27me3丰富被逆转,使生殖系基因表达成为可能.
结论:
- XCR 暂时与生殖细胞的性变异和剂量补偿有关.
- 由PRC2维持的表观遗传记忆会影响XCR进展.
- XCR与PRC2的功能有关,促进了雌性半月变异.
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