Z-DNA的形成调节了全能类状态,并促进了Zscan4依赖的染色质细分
Shireen Shajahan1,2,3, Yann Loe-Mie1,2,4, Laure Asselin1,2,5,6
1Institut Pasteur, Université Paris Cité, Nuclear Organization and Oncogenesis Unit, Paris, France.
Nature structural & molecular biology
|February 17, 2026
概括
Z-DNA的形成驱动着在两细胞类干细胞中创建一个独特的基因组区 (Z区),通过在胚胎早期发育过程中调节基因表达来保护全能性.
科学领域:
- 发展生物学 发展生物学
- 基因组学就是基因组学.
- 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:
- 从单细胞到双细胞阶段的过渡包括基因激活,表观基因组重编程和核重组.
- 来自小鼠胚胎干细胞的双细胞样细胞模仿了这个阶段,表现出特定的基因表达 (Dux,Zscan4,MERVL) 和放松的染色体.
研究的目的:
- 调查 Zscan4 染色体因子在两细胞阶段过渡期间形成染色体间和染色体内相互作用中的作用.
- 阐明产生全能类细胞和建立一个独特的基因组区的机制.
主要方法:
- 用 Zscan4.4 驱动的染色质相互作用的分析.
- 研究Z-DNA的形成及其通过聚胺水平的调节.
- 描述Z区的表观遗传标记和基因表达特征.
主要成果:
- Zscan4驱动的染色体相互作用形成了一个独特的基因组区,Z区,独立于凝聚素和CTCF.
- 受到多氨酸的影响的Z-DNA形成促进了全能细胞的形成,并建立了Z区.
- Z区显示活跃基因素标记的减少以及与分化相关的基因的表达的减少.
结论:
- Z-DNA的形成起着双重作用:启动胚胎基因组激活 (ZGA) 和组织基因组以保持类似于全能的状态.
- Z区限制非ZGA基因在允许的染色体环境中的表达,从而保持多能性.
相关概念视频
Inheritance of Chromatin Structures
7.6K
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
7.6K
Chromatin Modification in iPS Cells
2.2K
Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
2.2K
Chromatin Position Affects Gene Expression
25.0K
Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area.
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
25.0K
Duplication of Chromatin Structure
7.4K
The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
7.4K
Heterochromatin
18.8K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
18.8K
Euchromatin
9.1K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
9.1K


