在人类生长障碍中的增强剂和双价促销剂的融合DNA甲基化异常
Marie E S Wheeler1, Yoshiko Takahashi1, Jihye Lee2
1Department of Microbiology and Molecular Genetics, School of Medicine, University of California, Irvine, Irvine, CA, USA.
Epigenetics & chromatin
|December 28, 2025
概括
DNMT3A和NSD1中的突变会影响DNA甲基化,导致过度生长或生长限制. 这些发现揭示了局部特异的DNA甲基化缺陷和异常生长中的失调双价促进体.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 遗传学 是一个遗传学.
- 发展生物学 发展生物学
背景情况:
- DNMT3A (DNA甲基转移酶) 或NSD1 (基因组甲基转移酶) 的功能丧失突变与过度生长综合征有关.
- 破坏DNMT3A与H3K36me2的相互作用 (基因组修饰) 会导致生长限制.
研究的目的:
- 研究与DNMT3A和NSD1突变相关的相反生长结果 (过度生长与生长限制) 背后的分子机制.
- 澄清H3K36me2在指导DNA甲基化维护增强剂中的作用.
主要方法:
- 生成的同源性人类胚胎干细胞具有DNMT3A和NSD1.1.的生长综合征相关突变.
- 分析了活性增强剂和双价促进剂的DNA甲基化模式.
主要成果:
- 与过度生长和生长限制相关的DNMT3A突变都导致了在活性增强剂的共享子集中的DNA低甲基化.
- H3K36me2似乎直接增强甲基化维护.
- 双对应促进剂显示出不同的DNA甲基化:增长限制中的高甲基化 (DNMT3A突变) 和过度生长中的低甲基化 (DNMT3A或NSD1突变).
结论:
- 局部特定的DNA甲基化缺陷是DNMT3A/NSD1突变引起的生长综合征中常见的分子特征.
- 在双价促销物中失调的DNA甲基化可能会驱动异常生长表型.
相关概念视频
Epigenetic Regulation
3.7K
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
3.7K
Epigenetic Regulation
33.4K
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
33.4K
Genomic Imprinting and Inheritance
36.7K
Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
36.7K
Spreading of Chromatin Modifications
9.2K
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...
9.2K
Position-effect Variegation
6.9K
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.
6.9K
Abnormal Proliferation
5.0K
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...
5.0K


