家庭主域参与核HOX蛋白的homo-和异种化
Damien Marchese1, Laetitia Evrard1, Isabelle Bergiers1
1Louvain Institute of Molecular Science and Technology, Université catholique de Louvain, 5 (L7.07.10) Place Croix du Sud, 1348 Louvain-la-Neuve, Belgium.
International journal of molecular sciences
|January 11, 2025
概括
对于胚胎发育至关重要的HOX蛋白质可以形成二次体. 这项研究表明,HOXA1的二分化独立于其DNA结合域发生,这表明它在HOX基因调节中的作用.
科学领域:
- 发展生物学 发展生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 霍克斯基因对于胚胎前后轴模式和器官生成至关重要.
- 哺乳动物的HOX基因 (共39个,分为4个群) 呈现出嵌套的表达模式,这意味着在胚胎区域内多个HOX基因的共同表达.
- 虽然建议HOX蛋白相互作用 (同质体/异质体),但它们的功能后果仍然不太清楚.
研究的目的:
- 为了研究HOX蛋白质形成同型和异型二极体的能力.
- 阐明在HOX蛋白质二分化和局部化中特定域 (如家庭域) 的作用.
- 探索HOX-HOX相互作用对基因调节的影响.
主要方法:
- 从数据库中编译出所有已知的HOX-HOX交互的存储库.
- 实验评估了HOXA1,HOXA2和HOXA5蛋白质的同型和异型聚变能力.
- 利用域特异性突变来研究同居域和六对二分化和核定位的必要性.
主要成果:
- 对于HOXA1的同位体化,不需要DNA结合的同位体.
- HOXA1二元化的核定位取决于家庭主体,特别是其第三螺旋的完整性.
- 霍克萨1可以影响一个缺乏家庭主体的霍克萨1突变的染色质协会.
- HOXA1 核同质化是独立于六和它的相互作用者,PBX 蛋白质.
结论:
- 在调节HOX基因功能方面,HOX蛋白二元化是重要的机制.
- 家庭主体在HOX蛋白质二极体的核定位中发挥着关键作用.
- 在发育过程中,二分化可能代表HOX介导的基因调节中的新复杂层.
相关概念视频
Heterochromatin
10.6K
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...
10.6K
Hedgehog Signaling Pathway
7.3K
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
7.3K
Master Transcription Regulators
6.9K
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
6.9K
Histone Modification
13.0K
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...
13.0K
The Nucleosome Core Particle
862
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
862
Cooperative Binding of Transcription Regulators
6.3K
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
6.3K


