染色体は,バイオオリエンテーションの前にメタフェーズプレートに集合することができる
Tarun M Kapoor1, Michael A Lampson, Polla Hergert
1Laboratory of Chemistry and Cell Biology, Rockefeller University, New York, NY 10021, USA.
Science (New York, N.Y.)
|January 21, 2006
まとめ
クロモゾームは,完全にスパインドルに結合する前に,細胞の中心に移動することができます. この染色体収束は,CENP-E運動タンパク質に依存し,細胞分裂に関する以前の仮定に異議を唱える.
科学分野:
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
背景:
- スピンドル赤道への染色体収束は,細胞分裂中の正確な遺伝物質の伝播に不可欠です.
- 染色体収束は,染色体が対極のスパインドル極に結合するバイオリエンテーションを必要とすると広く考えられています.
研究 の 目的:
- 染色体が哺乳類の細胞で生物指向化を達成する前に,スパインドル赤道に集合できるかどうかを調査する.
- この代替コングレッション経路に関与するメカニズムと分子プレーヤーを解明する.
主な方法:
- 細胞分裂段階を操作するために,可逆化学阻害剤を使用した.
- 生細胞光顕微鏡を用いて,染色体の動きを動的に観察した.
- 高解像度構造分析のための応用相関電子顕微鏡.
主要な成果:
- クロモソームが単向状態 (一本の極に付着) でスピンドル赤道に収束できることを示した.
- 観察されたモノ指向染色体は,バイ指向染色体のキネトコア繊維に沿って赤道に向かって滑っている.
- キネトコア関連マイクロチューブルモーター CENP-E (キネシン-7) を,このコングレッションメカニズムに不可欠なものとして特定した.
結論:
- 染色体の収束は,バイオオリエンテーションの前に起こり,確立されたモデルに異議を唱えます.
- CENP-Eによって媒介される新しい会議機構は,単向染色体の動きを促進します.
- この発見は,細胞分裂中の染色体分離の調節に関する新しい洞察を提供します.
関連する概念動画
01:17Karyotyping
Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
03:31Labeling DNA Probes
DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
01:03Fixation and Sectioning
Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
01:20Immunogold Electron Microscopy
Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.