関連する実験動画
Updated: Jul 11, 2026

14:49
Associated Chromosome Trap for Identifying Long-range DNA Interactions
Published on: April 23, 2011
CTCFは,Igf2/H19とWsb1/Nf1の間の染色体間コロカライゼーションを媒介する.
Jian Qun Ling1, Tao Li, Ji Fan Hu
1Medical Service, Department of Veterans Affairs, Palo Alto Health Care System, and Department of Medicine, Stanford University, Palo Alto, CA 94304, USA.
まとめ
染色体ループは遺伝子調節を可能にします. この研究では,CCCTC結合因子 (CTCF) が遺伝子領域間の染色体間関連を媒介し,遺伝子発現に影響を与え,DNA再結合のための新しいモデルを示唆することを発見しました.
科学分野:
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
- エピジェネティクス エピジェネティクス
背景:
- 遺伝子の転写は,染色体ループを通じて強化剤と絶縁剤によって調節されます.
- 遠く離れたゲノム領域間の相互作用は,遺伝子発現に影響を与える可能性があります.
- アレル特異的調節は,発達と疾患にとって極めて重要です.
研究 の 目的:
- 遺伝子調節における染色体間相互作用を調査する.
- これらの相互作用を媒介するCCCCTC結合因子 (CTCF) の役割を決定する.
- CTCF媒介の染色体間関連が遺伝子発現に及ぼす機能的影響を調査する.
主な方法:
- 染色体コンフォームキャプチャ (3C) 技術と光 in situ ハイブリダイゼーション (FISH).
- インスリン類似成長因子2 (Igf2) /H19のインプリント制御領域 (ICR) とWsb1/Nf1の位置の分析.
- CTCFの省略と母親のICRの削除を含む実験操作.
主要な成果:
- Igf2/H19 ICRアレル (7染色体) とWSb1/Nf1アレル (11染色体) のコロカリゼーションが実証されています.
- CTCFと母親のICRが,この染色体間関連にとって不可欠であることを示した.
- この関連を撤廃すると,Wsb1/Nf1の遺伝子発現が変化することを明らかにした.
結論:
- CTCFは,特定の遺伝子領域間の長距離染色体間関連を媒介する.
- これらの関連は,トランスクリプションファクトリー内で発生し,調整された遺伝子調節を促進します.
- DNA再結合とRNAトランススプライシングに関連する染色体間のアレル固有の相互作用のモデルを提供します.
関連する概念動画
Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
X-Inactivation
The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
Position-effect Variegation
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.
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...
Cis-regulatory Sequences
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
General Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...

