旧和新合成的基因组不对称地分布在Drosophila肠干细胞分裂中
Emily H Zion1, Daniel Ringwalt1, Kristina Rinaldi1
1Department of Biology, The Johns Hopkins University, Baltimore, MD, USA.
EMBO reports
|May 31, 2023
概括
果虫肠干细胞 (ISCs) 中旧和新组织素H3和H4的不对称遗传影响了细胞命运. 破坏这种模式会损害ISC分化,并促进类似干细胞的细胞群.
科学领域:
- 发展生物学 发展生物学
- 干细胞生物学 干细胞生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 基因组蛋白对于DNA包装和基因调节至关重要.
- 身体干细胞分裂需要机制来维持干细胞性并产生分化的细胞.
- 不对称的细胞分裂是干细胞生物学中决定命运的关键过程.
研究的目的:
- 研究Drosophila肠干细胞 (ISCs) 中不对称的组织素H3和H4分区的作用.
- 为了确定不对称的质子遗传对ISC行为和细胞命运的影响.
- 探索基因组遗传模式与细胞命运基因Delta的表达之间的联系.
主要方法:
- 研究Drosophila ISC分裂期间的组分子分区.
- 表达一个突变的H3T3A来破坏不对称的质子遗传.
- 分析细胞对后转移后的三角形表达模式.
- 使用单细胞RNA测序 (scRNA-seq) 来评估基因表达和分化.
主要成果:
- 在Drosophila ISC分裂过程中,旧和新基因组H3和H4分布不对称.
- 失衡的非对称组合素遗传 (H3T3A突变) 会导致增加Delta对称细胞对.
- 观察到过多的Delta阳性,ISC类细胞和受损的ISC分化.
- 不对称的组素遗传与明显的Delta表达模式相关,影响细胞身份.
结论:
- 非对称的质子遗传是一种潜在的机制,可以在体性干细胞系中建立独特的细胞身份.
- 这一过程对于维持干细胞恒常性和Drosophila ISCs的适当分化至关重要.
- 这些发现与Drosophila雄性生殖系干细胞的先前观察结果一致,这表明它发挥着保留的作用.
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