超级沉声器对于B细胞的发育和致癌是至关重要的
Di Huang1, Hanna M Petrykowska2, Dhaneshwar Kumar3
1Intramural Research Program, National Library of Medicine, National Institutes of Health, Bethesda, MD, USA.
Nature communications
|September 25, 2025
概括
超级沉默剂是B细胞发育中的关键调节元素,可在B细胞淋巴瘤中转化为超级增强剂,推动癌症的进展. 它们的变化与B细胞致癌有关.
科学领域:
- 遗传学 是一个遗传学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 癌症生物学 癌症生物学
背景情况:
- 压制性组素标记H3K27me3定义了声器,但信号强度有所不同.
- 超级沉声器代表具有异常强大的H3K27me3信号的区域.
研究的目的:
- 调查超级沉声器在B细胞发育和B细胞淋巴瘤中的作用和变化.
- 了解超级沉声器功能背后的机制及其与癌症的联系.
主要方法:
- 在B细胞中分析H3K27me3信号强度和超沉声器特征.
- 在B细胞淋巴瘤中,研究超级声器转化为超级增强器.
- 评估基因表达变化和对JQ1治疗的反应.
- 在超级沉声器中对变体和转位断点的基因组分析.
主要成果:
- B细胞超级沉默剂最初与发育中的基因上调有关,目标基因在干细胞中高度表达.
- 大约13%的B细胞超级沉默剂在B细胞淋巴瘤中转化为超级增强剂,影响超过一半的患者.
- 像BCL6和BACH2这样的基因被JQ1.1迅速下调.
- 超级沉声器对与癌症相关的变体和转位断点进行了显著的丰富.
- CpG的内容决定了超级沉声器的抑制机制,影响了发起者-增强器联系和循环.
结论:
- 超级沉声器在正常的B细胞调节中起着至关重要的作用.
- 超级抑制剂的变化,包括转换为超级增强剂和遗传变异的丰富,被认为是B细胞致癌的主要因素.
- 准超级沉声器或与之相关的途径可能为B细胞淋巴瘤提供治疗策略.
相关概念视频
Cancer-Critical Genes II: Tumor Suppressor Genes
9.4K
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
9.4K
B Cell Activation and Differentiation
16.0K
The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
16.0K
Loss of Tumor Suppressor Gene Functions
5.9K
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
5.9K
Abnormal Proliferation
5.1K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
5.1K
The Intrinsic Apoptotic Pathway
8.3K
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
8.3K
Replicative Cell Senescence
4.3K
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
4.3K


