染色质接触的遗传性变化与与饮食诱导的胰岛素失调和肥胖症的跨代易感性相关
Richard C Chang1, Riann J Egusquiza2, Angélica Amorim Amato1,3
1Department of Developmental and Cell Biology, University of California Irvine, Irvine, CA, USA.
Nature communications
|February 12, 2026
概括
产前暴露于环境肥胖原体可能导致跨代表观遗传. 这项研究表明,基暴露会改变雄性小鼠的染色质,导致没有DNA突变的后代发生代谢障碍.
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.
- 基因组学就是基因组学.
- 代谢障碍 代谢障碍 代谢障碍
背景情况:
- 跨代表观遗传允许特征在没有DNA变化的情况下跨代传递.
- 这种现象背后的机制在很大程度上是未知的.
- 环境暴露与遗传性代谢性疾病易感性有关.
研究的目的:
- 研究跨代表观遗传的分子机制.
- 确定环境暴露如何影响生殖线表观遗传学和后代健康.
- 探索染色质改变在代谢性疾病传播中的作用.
主要方法:
- 孕期暴露小鼠的肥胖因子增肥 (TBT).
- 在男性原始生殖细胞中的胰岛素降解酶 (Ide) 基因内对色素相互作用的分析.
- 评估肝脏的Ide表达,胰岛素,瘦素水平和后代的葡萄糖代谢.
- 跨多代的表型的评估 (F3).
主要成果:
- 暴露于TBT诱导了男性生殖细胞中Ide基因位点的染色质相互作用的遗传性变化.
- 这些染色质变化持续到F3代.
- 在暴露的男性后代中观察到肝脏Ide表达的减少,高胰岛素血症,高血糖症和高脂血症.
- 观察到的代谢表型模仿了Ide缺陷小鼠的代谢表型,导致肥胖.
- 这些影响是男性特有的,没有检测到DNA突变.
结论:
- 环境暴露可以诱导特定的,基于位置的3D染色体结构变化.
- 胚胎细胞中的这些表观遗传修饰可以在几代人之间传播.
- 这种机制为环境因素提供了一条途径,将代谢障碍的易感性传播给未暴露的后代.
- 证明了代谢性疾病风险的男性特异性表观遗传.
相关概念视频
Heritability
675
Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic"...
675
Chromatin Packaging
22.4K
Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter?
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...
22.4K
Obesity
1.4K
The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in...
1.4K
Spreading of Chromatin Modifications
9.5K
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...
9.5K
Inheritance of Chromatin Structures
7.6K
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
7.6K
Chromatin Position Affects Gene Expression
24.9K
Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area.
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
24.9K


