中心分子不稳定驱动染色体损伤和系统性硬化症中自身抗原暴露
Azait Imtiaz1, Mohammad Waseem1, Hudson O'Neill1
1Department of Genetics, University of Alabama at Birmingham, Birmingham, Alabama, 35233, USA.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
布莱俄米辛会损害中间体,导致染色体不稳定性和系统性硬化症 (SSc) 的免疫激活. 这种损伤涉及活跃的中间体,并导致错位的染色质,可能解释SSc自身抗体的特异性.
科学领域:
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
- 免疫学 免疫学 免疫学
背景情况:
- 中间体断裂与系统性硬化症 (SSc) 中的抗中间体抗体有关.
- 中心分子损伤的起源及其与SSc中免疫激活的联系尚未完全理解.
- 蓝菌素诱导纤维化模型是研究SSc.的关键实验系统.
研究的目的:
- 为了调查白素是否有选择性地破坏中心分子.
- 为了确定白色素诱导的中间体损伤是否有助于染色体的不稳定.
- 探索中粒体损伤和免疫性染色体错位化之间的联系.
主要方法:
- 在白胺小鼠模型,人体纤维细胞和SSc患者纤维细胞中评估中心体完整性和基因组损伤反应.
- 评估中心体α卫星复制号,DNA损伤/修复标记 (γH2AX,RAD51),微核和核外破裂.
- 免疫光显微镜用于分析用抗原呈现机器 (HLA-DRB1) 分析中心体色素同位素化.
主要成果:
- 布莱俄米辛导致了中心体的α卫星重复的选择性耗尽和活跃中心体的双链断裂 (CENP-A标记).
- 尽管依赖于ATM的RAD51-介导的修复,但仍然发生了持续的中间体损失,这表明恢复不完全.
- 观察到微核的增加,细胞质中的焦点和核膜破裂,以及CENP-B与HLA-DRB1的同位化,这表明来自中色素的抗原呈现.
结论:
- 活跃的中间体是白色素诱导的DNA损伤的脆弱目标,其修复不完全.
- 离心体不稳定导致错位染色质,可以参与抗原呈现途径.
- 这些发现提供了对SSc自身抗体特异性的机制性见解,并将基因组不稳定性与纤维性自身免疫中的免疫激活联系起来.
相关概念视频
Autoimmune Disorders
1.4K
Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
Concept and Mechanism of Autoimmune Diseases
The immune...
Concept and Mechanism of Autoimmune Diseases
The immune...
1.4K
Mutations
94.3K
Overview
94.3K
Nucleotide Excision Repair
4.9K
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
4.9K
Mismatch Repair
6.3K
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
6.3K
DNA Damage can Stall the Cell Cycle
9.9K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
9.9K
DNA Damage Can Stall the Cell Cycle
3.0K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
3.0K


