関連する実験動画
Updated: Jun 23, 2026

11:48
Detection of Alternative Splicing During Epithelial-Mesenchymal Transition
Published on: October 9, 2014
H-rasプロトオンコゲンの発現は,代替スプライシングによって制御されます
J B Cohen1, S D Broz, A D Levinson
1Department of Cell Genetics, Genentech, Inc., South San Francisco, California 94080.
Cell
|August 11, 1989
まとめ
H-ras 腫瘍遺伝子の突然変異です.
科学分野:
- 分子生物学は分子生物学である.
- 腫瘍遺伝子 (オンコゲネス) とは
- 遺伝子規制 遺伝子規制
背景:
- 以前の研究では,H-ras腫瘍遺伝子の最後のイントロンの点変異が,発現と変換効率を高めることを示しました.
- この現象の分子的根拠は,解明する必要がある.
研究 の 目的:
- 特定の点変異によるH-ras腫瘍遺伝子の発現の増加と変換効率の基礎を特定する.
- H-ras発現の調節におけるイントロニック要素の役割を調査する.
主な方法:
- 遺伝子再構築実験が行われました.
- 機能的要素を特定するために,ニュクレオチド変異が導入されました.
- トランスクリプトを検出および定量化するために,S1核酵素解析を使用しました.
- 代替スプライシングイベントを分析した.
主要な成果:
- H-rasイントロンの内にある負の作用を持つ元素が,その変異によって特定され,不活性化されました.
- この元素は,潜在的代替エクソンとして特徴付けられました.
- この変異は,この代替エクソンを含むトランスクリプトの合成を防ぐことが示されました.
- これらの代替トランスクリプトは,不安定性や処理欠陥のために,少量に存在する.
- 代替トランスクリプトの予測されたタンパク質製品には,変換の可能性がない.
結論:
- 代替スプライシングは通常,p21H-ras発現を抑制する.
- この代替スプライシングプロセスを破壊する突然変異は,ネガティブなコントロールを廃止し,腫瘍遺伝子の発現と変換の可能性を増加させます.
関連する概念動画
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
The Ras Gene
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...
Ras is a superfamily...
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...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...

