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Updated: Aug 12, 2026

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Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins
Published on: September 28, 2012
染色体凝縮と解凍の焦点は,3次元 in vivo タイムラップ顕微鏡で明らかになりました
Y Hiraoka1, J S Minden, J R Swedlow
1Department of Biochemistry and Biophysics, University of California, San Francisco 94143-0448.
Nature
|November 16, 1989
まとめ
染色体は,セントロメアやテロメアだけでなく,特定の核膜の領域で解凍され,凝縮されます. これらの部位は,細胞サイクル全体を通して染色体組織を導き,核動力学に関する新しい洞察を明らかにします.
科学分野:
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
- 顕微鏡による顕微鏡検査
背景:
- 染色体ダイナミクスは,ミトーシス過程でよく研究されているが,インターフェーズ過程ではほとんど理解されていない.
- 以前の研究では,核の周辺で非均一な染色体凝縮が示唆されていた.
研究 の 目的:
- インターフェーズへの移行および移行中の染色体行動を記録する.
- 生体組織における染色体凝縮と解凍のダイナミックなプロセスを理解する.
主な方法:
- 先進的な3次元タイムラップの光顕微鏡を用いた.
- 新しいステレオプロジェクションとコンピューティング処理により,画像解像度が向上しました.
主要な成果:
- 染色体はテロフェーズからインターフェーズを通ってプロフェーズ凝縮まで解凍される.
- 核包膜の特定の染色体領域を特定し,セントロメアとテロメアを除いて,脱凝縮/凝縮の焦点として使用します.
- 遅い解冷却部位が,その後のプロフェーズにおける初期の凝縮部位と相関することを発見した.
結論:
- 特定の核包膜領域は,インターフェーズ中の染色体組織のための重要な場所として機能します.
- この発見は,染色体ダイナミクスと細胞サイクル全体を通しての核構造に関する新しい視点を提供します.
関連する概念動画
Chromosome Structure
A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
Polytene Chromosomes
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...
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...
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...
Forces Acting on Chromosomes
During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...
Microtubules and motor proteins exert two types of forces on...

