基因素H3.3异型的外源表达会导致C的核外分裂. 优雅的肠道肠道肠道
bioRxiv : the preprint server for biology
|May 5, 2025
概括
基斯H3.3在发育过程中在调节细胞分裂方面起着令人惊的作用. 在记者虫中观察到异常的核分裂,揭示了正常组织中组织蛋白的新功能.
科学领域:
- 分子生物学分子生物学
- 发展生物学 发展生物学
- 遗传学 是一个遗传学.
背景情况:
- 基因组蛋白对于DNA包装和基因调节至关重要.
- 基因组突变与癌症和其他疾病有关.
- 研究往往忽略了正常,差异化的组织中的基因素作用.
研究的目的:
- 调查正常动物发育中的基质子功能.
- 在素H3.3记者中观察到一个意想不到的表型的特征.
- 在细胞分裂中识别 histone H3.3 的新角色.
主要方法:
- 使用*Caenorhabditis elegans*作为一个模型生物.
- 在虫的肠道中产生单复制的组素H3.3记者.
- 采用DNA光在现场杂交 (FISH) 来评估染色体拷贝数.
主要成果:
- 希斯H3.3记者在前肠中引起了额外的核.
- 这种表型涉及在Endoreduplication过程中异常的核分裂.
- 影响H3.3沉积的突变改善了额外核表型.
- 额外的核含有约一半的控制核的DNA含量.
结论:
- 素H3.3在发育过程中调节核分裂方面具有以前未知的功能.
- 这一发现突出了基因组变异在末端分化组织中的潜在新角色.
- 基因组复制过程中,基因组稳定性的维护可能是基因组H3.3的关键.
相关概念视频
Inheritance of Chromatin Structures
6.1K
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...
6.1K
Chromatin Position Affects Gene Expression
23.1K
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...
23.1K
Position-effect Variegation
6.2K
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
6.2K
Chromatin Modification in iPS Cells
1.6K
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...
1.6K
Heterochromatin
9.0K
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...
9.0K
Histone Variants at the Centromere
4.3K
Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
4.3K


