人类基因组DNA与i-motif结构广泛交织在一起
Cristian David Peña Martinez1,2, Mahdi Zeraati1,2,3, Romain Rouet1,2
1Garvan Institute of Medical Research, Darlinghurst, Sydney, NSW, 2010, Australia.
The EMBO journal
|August 29, 2024
概括
在人类基因组DNA中,DNAi-motif结构很普遍,在上调基因中很常见. 这项研究绘制了它们的全基因组分布图,为基因组调节和功能提供了洞察力.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 在人类细胞核中形成的DNAi-motif结构与基因组调节有关.
- 之前的研究表明,使用免疫光染色,NMR和CUT&Tag.等技术来证明i-motif的存在和分布.
- 然而,人类基因组DNA的精确丰富性和分布在很大程度上仍然没有被描述.
研究的目的:
- 在人类基因组DNA中绘制基因组范围内的DNAi-motif结构的丰富性和分布.
- 识别能够在整个基因组中形成i-motif结构的特定DNA序列.
- 为了解i-motif结构的基因组,结构和分子作用提供基础资源.
主要方法:
- 使用高亲和度i-动机免疫沉,然后进行测序 (HPIS) 来映射i-动机.
- 将HPIS应用于来自人类细胞系 (MCF7,U2OS,HEK293T) 的净化基因组DNA.
- 使用生物层干涉测量和循环二极化谱法验证的结果.
主要成果:
- 在整个人类基因组中确定了i-motif形成序列的广泛分布.
- 在G0/G1细胞周期阶段上调的基因中发现i-动机序列是常见的.
- 建立了一个i-motif结构的全基因组图.
结论:
- 为人类基因组DNA中i-motif结构的广泛形成提供了实验证据.
- 证明i-motif序列普遍存在并与特定的基因表达模式相关.
- 这项研究为未来研究DNAi-motifs的功能意义提供了宝贵的资源.
相关概念视频
Organization of Genes
68.5K
Overview
68.5K
Single Nucleotide Polymorphisms-SNPs
14.9K
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
14.9K
Inheritance of Chromatin Structures
6.2K
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...
6.2K
Genomic DNA in Eukaryotes
46.8K
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.
46.8K
Position-effect Variegation
6.3K
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.
6.3K
Duplication of Chromatin Structure
5.4K
The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
5.4K


