在Arabidopsis中的七个H3K4甲基转移酶中对色素向机制的比较性表征
Satoyo Oya1, Susumu Uehara2, Hideko Watabe3
1Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan; Department of Plant Sciences, University of California Davis, Davis CA 95616.
Plant communications
|January 7, 2026
概括
基因组H3氨酸4甲基化 (H3K4me) 调节了基因转录. 这项研究分析了Arabidopsis H3K4甲基转移酶,揭示了不同的向机制,并突出了植物和动物之间H3K4me3调节的差异.
科学领域:
- 植物分子生物学 植物分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因调节 基因调节
背景情况:
- 基因组H3氨酸4甲基化 (H3K4me) 是与活性转录相关的关键表观遗传标记.
- H3K4me的分布是动态的,并由H3K4甲基转移酶 (HMTs) 调节.
- 植物,如Arabidopsis,拥有多个HMT基因,表明复杂的调节作用.
研究的目的:
- 为了比较分析Arabidopsis中的七个H3K4甲基转移酶.
- 阐明植物H3K4甲基转移酶的目标特异性的机制.
- 了解H3K4me3调节的进化分歧.
主要方法:
- 对表观基因组进行比较分析.
- 生物化学方法的方法.
- 染色体免疫沉降测序 (ChIP-seq) 是一种
- 蛋白质与蛋白质相互作用的研究.
主要成果:
- ATX1-ATX5 (Trx/Trr型) HMTs表现出明显的局部化模式,并与特定的染色质修饰和DNA图案相关联.
- ATX3 与ASR3和RAP2.11转录因子相互作用.
- ATXR7 (Set1型) 和ATXR3 (非法典型) HMTs与转录机械共定位,这表明了共转录的角色.
- 主要的H3K4me3甲基转移酶ATXR3形成了一个独立于COMPASS的复合体,表明植物的调节不同.
结论:
- 植物H3K4甲基转移酶表现出不同的向策略.
- 特定的HMT与转录因子相互作用或与转录机械相结合.
- 植物中的H3K4me3调节机制与动物的调节机制有很大不同,特别是关于COMPASS复杂的参与.
相关概念视频
Spreading of Chromatin Modifications
9.3K
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
Writers
The writer...
9.3K
Histone Modification
15.9K
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
15.9K
Heterochromatin
17.8K
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...
17.8K
Euchromatin
8.8K
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...
8.8K
Position-effect Variegation
7.0K
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.
7.0K
Chromatin Modification in iPS Cells
2.1K
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...
2.1K


