相关实验视频
Updated: May 13, 2026

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Pattern-based Search of Epigenomic Data Using GeNemo
Published on: October 8, 2017
人口表观基因组多样性的模式
Robert J Schmitz1, Matthew D Schultz, Mark A Urich
1Plant Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA.
Nature
|March 8, 2013
概括
在Arabidopsis thaliana表观遗传变异影响特征,但其遗传基础是不清楚的. 这项研究揭示了RNA指导的DNA甲基化如何与遗传变异相互作用,从而在植物种群中创造多样性.
科学领域:
- 植物基因组学和表观遗传学
- 种群遗传学和变异的变化
背景情况:
- 表观遗传变异有助于表型多样性,但其与遗传变异的相互作用需要澄清.
- 了解表观遗传差异的遗传基础对于解释人口水平变异至关重要.
研究的目的:
- 为了研究野生Arabidopsis thaliana的遗传和表观遗传变异之间的相互作用.
- 确定影响DNA甲基化模式的遗传因素及其对表型多样性的贡献.
主要方法:
- 从野生Arabidopsis thaliana加入中对全种群的基因组,转录组和甲基组进行测序.
- 对DNA甲基化多态的分析及其与遗传变异的联系.
- 关联研究以确定甲基化定量特征位点 (mQTLs).
主要成果:
- 单单的细胞因子甲基化多态不直接与基因型相关.
- 由RNA指导的DNA甲基化向的区域显示链接不平衡衰变,类似于单核酸多态.
- 数以千计的mQTLs被确定,揭示了整个人口中遗传依赖的甲基化变异.
- 导向RNA的DNA甲基化点在花粉和种子中被表观遗传激活.
结论:
- 遗传变异影响DNA甲基化模式,特别是那些被RNA导向DNA甲基化向的DNA甲基化模式.
- 通过RNA指导的DNA甲基化进行表观遗传调节,在植物发育中起作用,特别是在生殖组织中.
- 这项研究提供了关于表观遗传变异的遗传基础及其在人口多样性中的作用的见解.
相关概念视频
What is Population Genetics?
A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Epigenetic Regulation
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...
Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Inheritance of Chromatin Structures
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 DNA...
Genomic DNA in Eukaryotes
Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.

