関連する実験動画
Updated: Jul 13, 2026
05:39
Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
Published on: December 2, 2022
ハプロイド酵母における細胞生理学と細胞分裂に対するアヌプロイドの効果
Eduardo M Torres1, Tanya Sokolsky, Cheryl M Tucker
1Center for Cancer Research, Howard Hughes Medical Institute, Massachusetts Institute of Technology, E17-233, 40 Ames Street, Cambridge, MA 02139, USA.
Science (New York, N.Y.)
|August 19, 2007
まとめ
アヌプロイド性,または余分な染色体は,細胞サイクル障害を引き起こし,酵母におけるグルコースの吸収を増加させます. これらの変化は,タンパク質の生産の増加と細胞の不均衡の結果であり,細胞増殖に影響を及ぼします.
科学分野:
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
- がん研究 がん研究
背景:
- アヌプロイド症は腫瘍細胞に多く見られるが,その生理学的影響は不明である.
- アヌプロイド症の細胞上の影響を理解することは,がん生物学にとって極めて重要です.
研究 の 目的:
- アヌプロイド症の細胞生理,特に余分な染色体の増殖を調査する.
- アヌプロイド酵母菌株に関連するフェノタイプを特徴付ける.
主な方法:
- 個々の染色体の余分なコピーを持つハプロイド酵母菌株を作成しました.
- 細胞サイクル進行,グルコース吸収,ストレス反応のためのフェノタイプ的に特徴づけられたアヌプロイド菌株.
主要な成果:
- アヌプロイド酵母菌株は,細胞循環の欠陥,グルコースの吸収の増加,およびタンパク質合成/折り畳み干渉に対する敏感性などの共通現象型を示しています.
- これらのフェノタイプは,余分な遺伝子の存在と,その結果生じるタンパク質の不均衡と相関しており,特定の染色体同一性とは関係ありません.
結論:
- アヌプロイド症は,増殖的な欠陥と独特の細胞現象型を課します.
- アヌプロイジーの影響は,特定の余分な染色体とは関係なく,タンパク質の生産の増加と細胞組成の不均衡に関連しています.
関連する概念動画
01:21Nondisjunction
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...
01:29Nondisjunction
During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
02:57Meiosis vs. Mitosis
Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
02:57Meiosis vs. Mitosis
Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
01:28Yeast Signaling
Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...
02:02Meiosis II
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...