関連する実験動画
Updated: Jul 21, 2026

09:20
CRISPR-Mediated Reorganization of Chromatin Loop Structure
Published on: September 14, 2018
まとめ
遺伝子発現は,クロマチンの構造の変化により,急速に切り替えることができます. この研究では,マウス細胞におけるヘルペス・シンプレックスウイルスチミジンキナーゼ (HSV-tk) 遺伝子の高頻度スイッチングが観察され,クロマチンのアクセシビリティに関連していた.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- エピジェネティクス エピジェネティクス
背景:
- ヘルペス・シンプレックスウイルスチミジンキナーゼ (HSV-tk) 遺伝子は,遺伝子調節の研究のモデルである.
- 遺伝子発現の調節を理解することは,遺伝子治療と分子生物学の研究に不可欠です.
研究 の 目的:
- マウスの線維芽細胞で,感染したHSV-tk遺伝子の調節の基礎にある分子メカニズムを調査する.
- HSV-tkを発現する細胞で観察された高周波現象型スイッチングの基礎を決定する.
主な方法:
- tk+マウスの線維芽細胞系を用いて,tk-フェノタイプに逆戻り,その後tk+に再逆戻りすることができました.
- 復元細胞および再復元細胞における分析された酵素活性およびtk特異のトランスクリプト.
- 外国DNAの組織,CpGメチル化パターン,およびDNAase I消化によるクロマチンの構造を評価した.
主要な成果:
- tk+細胞系では,高頻度 (5%) の tk-への逆転と,tk+への再逆転が見られた.
- リバータントはTk酵素活性とトランスクリプトが欠け,DNA組織やメチル化に変化はなかった.
- 再現した細胞は,tk配列でDNAase Iの感受性の増加を示し,染色体構造の変化を示した.
結論:
- 高周波遺伝子発現のスイッチングは,染色体構造の変化によって媒介されます.
- これらのクロマチンの改変は,統合部位における宿主DNA配列の影響を反映している可能性があります.
- 発見は,ダイナミックな遺伝子調節と表遺伝的メカニズムについての洞察を提供します.
関連する概念動画
What is Gene Expression?
Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
What is Gene Expression?
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then processed and...
Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Structure of a Gene
A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
However, only 1% of the DNA is composed of genes that encode proteins; the rest, 99% is non-coding DNA. This non-coding DNA performs...
However, only 1% of the DNA is composed of genes that encode proteins; the rest, 99% is non-coding DNA. This non-coding DNA performs...
Regulation of Expression at Multiple Steps
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...

