関連する実験動画
Updated: Mar 14, 2026

07:34
A Method to Study de novo Formation of Chromatin Domains
Published on: August 23, 2019
5.9K
新しいクロマチンドメインの形成は,ゲノム複製の病原性を決定する
Martin Franke1,2, Daniel M Ibrahim1,2,3, Guillaume Andrey1
1Max Planck Institute for Molecular Genetics, RG Development &Disease, 14195 Berlin, Germany.
Nature
|October 6, 2016
まとめ
ゲノム複製により,新しい染色体領域 (ネオ-TAD) が作られ,遺伝子調節が変化し,病気を引き起こす可能性があります. これらの発見は,構造的変異がゲノム組織と病気の病理にどのように影響するかを明らかにしています.
科学分野:
- ゲノミクス
- 分子生物学
- 発達生物学
背景:
- トポロジカル・アソシエイトドメイン (TAD) は,増強剤と遺伝子の相互作用を制限することによって,規制単位を定義するゲノム組織にとって極めて重要です.
- TADの形成と病気の病理学におけるその役割を支配するメカニズムは完全に理解されていません.
研究 の 目的:
- 構造的なゲノム変異,特に重複がクロマチン領域の形成とその関連分子病理にどのように影響するか調査する.
- 構造的変異によって彫刻された安定したゲノム制御単位としてのTADの役割を明らかにする.
主な方法:
- Hi-Cと4C-seqのキャプチャを含む染色体構成のキャプチャ技術が使用されました.
- 遺伝子組み換えマウスと特定のゲノム複製を持つ患者の細胞を分析した.
主要な成果:
- ゲノム複製により,新しい染色体ドメイン (neo-TAD) が形成される.
- TAD内の重複は,TADの構造を変えることなく,内部の接触が増加し,TAD間の重複は孤立した新TADを形成した.
- Kcnj2遺伝子をネオ-TADに組み込むと,誤った発現と肢体の変形現象型が生じました.
結論:
- TADは構造的変異によって再構成できる 安定したゲノム制御単位です
- ネオ-TADの形成を理解することは,遺伝疾患と癌の診断におけるコピー番号の変動を解釈するために重要です.
- 構造的なゲノム変異と染色体組織への影響は進化的に重要だ.
関連する概念動画
Duplication of Chromatin Structure
7.5K
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...
7.5K
Inheritance of Chromatin Structures
7.8K
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...
7.8K
Polytene Chromosomes
11.2K
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
11.2K
Spreading of Chromatin Modifications
9.9K
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...
9.9K
Gene Duplication and Divergence
8.2K
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
8.2K
Chromatin Position Affects Gene Expression
25.1K
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...
25.1K

