関連する実験動画
Updated: Jul 11, 2026
12:48
The Multifaceted Benefits of Protein Co-expression in Escherichia coli
Published on: February 5, 2015
cis-およびtrans-acting コントロールに対する複数のエプシロン-グロービンキャップサイトの異なる応答
Cell
|September 1, 1984
まとめ
研究者らは,エプシロン・グロービン遺伝子が,非赤血球細胞の転写開始のために上流部位 (-200キャップ部位) を利用することを発見した. このサイト,このサイト.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子規制 遺伝子規制
- 遺伝学 遺伝学とは
背景:
- ヒトのエプシロン・グロービン遺伝子は,メインmRNAキャップサイトより上流に代替の転写開始部位を示しています.
- 非赤血球細胞系は,エプシロン・グロービン遺伝子の転写が"漏れ"していることを示しており,主に -200キャップ部位にあります.
研究 の 目的:
- ヒトのエプシロン・グロービン遺伝子の -200キャップ部位とメジャーキャップ部位での転写開始の独立した調節を調査する.
- そのクロマチンの構造により,ポリメラーゼのエントリーサイトとしての -200キャップサイトの役割を調査する.
主な方法:
- 遺伝子の転写を研究するために,一時的な発現アッセイが採用されました.
- プラズミド複製,SV40強化元素,アデノウイルスE1A遺伝子への反応として転写開始の分析.
- S1ヌクレアゼ感受性アッセイは,構造が変化したDNA領域をマッピングします.
主要な成果:
- -200キャップサイトとメジャーキャップサイトからの転写開始は,独立に規制することができます.
- -200キャップの部位は,超巻きプラズミド内のS1過敏性の領域に位置しています.
- ウイルスの増強剤がない場合, -200キャップ部位は,感染後の主要な発症部位です.
結論:
- -200キャップ部位は,アクセス可能なクロマチンの構造により,ポリメラーゼのエントリー部位として機能する可能性が高い.
- 調節分子は, -200キャップサイトでのポリメラーゼ結合効率を調節する可能性があります.
- 代替的な転写開始部位の独立した規制は,遺伝子発現制御の柔軟性を提供します.
関連する概念動画
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02:02Cis-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...
02:13Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
01:30General 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...
02:02Cis-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...
02:13Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...