関連する実験動画
Updated: Jun 14, 2026

06:39
Live Cell Imaging of Chromosome Segregation During Mitosis
Published on: March 14, 2018
人間のタンパク質複合体の体系的な分析により,染色体分離タンパク質が特定される
James R A Hutchins1, Yusuke Toyoda, Björn Hegemann
1Research Institute of Molecular Pathology (IMP), Dr. Bohr-Gasse 7, A-1030 Vienna, Austria.
まとめ
研究者らは,細胞分裂と染色体分離に不可欠な新しいタンパク質サブユニットを特定しました. この研究は,細胞循環調節に関与する重要な複合体の理解を深め,将来の研究のための方法を提供します.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 染色体分離と細胞分裂は,基本的な生物学的プロセスです.
- 多くのタンパク質複合体が関与しているが,その構成は完全に理解されていない.
- 最近のRNA干渉スクリーンは,これらのタンパク質複合体に関する知識のギャップを示唆しています.
研究 の 目的:
- 細胞分裂に関与するヒトのタンパク質複合体を特徴付ける.
- 重要な細胞機構の新しいサブユニットを特定する.
- タンパク質複合体の高通量分析のための方法を開発する.
主な方法:
- バクテリアの人工染色体を使った遺伝子タグ付け.
- タンパク質の局所化に関する研究.
- マススペクトロメトリー (TAP-MS) と組み合わせたタンデム・アフィニティ浄化.
主要な成果:
- 約100種類のヒトタンパク質複合体の分析.
- これまで未知の,進化的に保存されたサブユニットの発見.
- アナフェーズ促進複合体とガンマチューブリン環複合体の新しい成分を特定する.
結論:
- この研究は,ヒト細胞のタンパク質複合体の組成に関する理解を大幅に拡大する.
- スピンドル組立と染色体分離を調節する重要な複合体の新しいサブユニットが見つかりました.
- 記述された方法論は,哺乳類の細胞研究における将来の高通量分析に適用できます.
関連する概念動画
Condensins
Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
Condensins
Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
The plant and animal cells contain two types of condensin complexes—condensin I and condensin II. Both complexes have five subunits: two SMC (Structural Maintenance of Chromosomes) subunits, a kleisin subunit, and two HEAT-repeat...
Meiosis 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,...
Separation of Sister Chromatids
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
The Spindle Assembly Checkpoint
The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Cohesins
Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of homologous...

