関連する実験動画
Updated: Feb 2, 2026
13:10
Analysis of DNA Double-strand Break DSB Repair in Mammalian Cells
Published on: September 8, 2010
32.7K
CDK12は,内部ポリアデニレーションを抑制することによって,DNA修復遺伝子を調節する
Sara J Dubbury1,2, Paul L Boutz1,3, Phillip A Sharp4,5
1Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, USA.
Nature
|November 30, 2018
まとめ
CDK12の喪失は,ヒトの癌に保存されるメカニズムである内部ポリアデニレーションを増加させることで,同種の再結合 (HR) 遺伝子発現を阻害する. この発見は,BRCAness腫瘍の潜在的な治療標的とバイオマーカーとしてCDK12を強調しています.
科学分野:
- 分子生物学
- 癌 生物学
- 遺伝学
背景:
- 同性複合 (HR) 修復遺伝子の変異は"BRCAness"腫瘍を引き起こし,DNAを損傷する化学療法薬に対する感受性を高めます.
- CDK12は,他のHR関連遺伝子とは異なり,RNAポリメラーゼIIのリン酸化によって転写を調節する.
- CDK12がHR遺伝子発現に影響する正確なメカニズムは不明である.
研究 の 目的:
- CDK12が同種の再結合 (HR) 遺伝子を調節するメカニズムを解明する.
- 内部ポリアデニレーション現象を抑制するCDK12の役割を調査する.
- このメカニズムがCDK12変異を持つヒトの腫瘍に保存されているかどうかを判断する.
主な方法:
- マウスの胚性幹細胞を用いて,CDK12が遺伝子発現に及ぼす全体的な影響を研究した.
- HR遺伝子と他の発現遺伝子の内部ポリアデニレーション部位を分析した.
- ヒトの腫瘍サンプルにおけるCDK12の調節メカニズムの保存を調べた.
主要な成果:
- CDK12は全般的に内部ポリアデニレーションを抑制し,完全なHR遺伝子製品の生成を促進します.
- HR遺伝子は,CDK12喪失に敏感な内部ポリアデニレーション部位の高頻度を示しています.
- この調節メカニズムは,機能喪失のCDK12変異を有するヒト腫瘍に保存されます.
結論:
- 内部ポリアデニレーションを抑制するCDK12の機能は,HR遺伝子発現を維持する役割を説明する.
- CDK12の機能の喪失はHR修復の障害につながり,BRCAnessのフェノタイプに寄与する.
- CDK12は有望な治療標的であり,BRCAnessに関連した癌の潜在的なバイオマーカーです.
関連する概念動画
02:25Overview of DNA Repair
33.7K
In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
Chemically...
33.7K
02:25Overview of DNA Repair
9.9K
9.9K
02:07Organization of Genes
73.5K
Overview
73.5K
01:42What is Gene Expression?
196.7K
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...
196.7K
02:41Chromatin Structure Regulates pre-mRNA Processing
8.2K
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
8.2K
01:23Negative Regulator Molecules
38.5K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
38.5K