まとめ
免疫グロブリン重鎖ロカス内のDNA配列は,遺伝子転写を強化する. 重鎖結合 (Jh) とム鎖定数 (Cmu) の領域の間に位置するこの強化器領域は,SV40初期プロモーターで機能します.
科学分野:
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 免疫グロブリンの重鎖ロカスには,遺伝子発現を制御する規制要素が含まれています.
- 転写強化剤は,遺伝子転写率を高めるDNA配列である.
研究 の 目的:
- 免疫グロブリン重鎖ロカス内の2つの特定の領域の転写強化活性を調べる.
- これらの領域がシミアンウイルス40 (SV40) の早期プロモーターの転写を強化できるかどうかを判断する.
主な方法:
- 免疫グロブリン重鎖ロカスからのDNA断片のクローン.
- これらの断片をSV40初期プロモーターの隣接に挿入する.
- トランスクリプションの強化活性を測定する.
主要な成果:
- 重鎖結合 (Jh) とム鎖定数 (Cmu) の間の中間領域からのDNA配列は,強化剤の活性を示した.
- この増強剤の活動は,DNA断片がSV40初期プロモーターの上流 (5') または下流 (3') に置かれたときに観察された.
- Cアルファとアルファスイッチの間のDNA領域は,この実験システムでは転写強化剤の活性を示さなかった.
結論:
- 機能的な転写強化要素は,免疫グロブリン重鎖ロカスの中間配列内に存在する.
- この強化要素は,SV40早期プロモーターのような異質プロモーターの活性を調節することができます.
- アルファスイッチサイト付近の領域は,テストされたプロモーターの文脈で強化剤の活性が欠如しています.
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...
RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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...
RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...


