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関連する概念動画

Polytene Chromosomes02:04

Polytene Chromosomes

11.1K
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...
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Chromosome Structure02:40

Chromosome Structure

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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...
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Lampbrush Chromosomes01:51

Lampbrush Chromosomes

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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
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Chromosome Replication02:31

Chromosome Replication

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Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins.  This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin...
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The Mitotic Spindle02:27

The Mitotic Spindle

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The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures...
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Chromosomal Theory of Inheritance01:39

Chromosomal Theory of Inheritance

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In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”
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Fluorescent in situ Hybridization on Mitotic Chromosomes of Mosquitoes
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Fluorescent in situ Hybridization on Mitotic Chromosomes of Mosquitoes

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ミトスの染色体形成の経路

Johan H Gibcus1, Kumiko Samejima2, Anton Goloborodko3

  • 1Program in Systems Biology, Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, 368 Plantation Street, Worcester, MA 01605, USA.

Science (New York, N.Y.)
|January 20, 2018
PubMed
まとめ
この要約は機械生成です。

ミトスの染色体形成は,インターフェーズの組織が急速に失われ,ネスト状のクロマチンのループが形成される. コンデンシンタンパク質は,この過程で重要な役割を果たし,コンデンシンIIは螺旋巻きに不可欠です.

さらに関連する動画

Observing Mitotic Division and Dynamics in a Live Zebrafish Embryo
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Observing Mitotic Division and Dynamics in a Live Zebrafish Embryo

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Live Cell Imaging of Chromosome Segregation During Mitosis
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関連する実験動画

Last Updated: Feb 15, 2026

Fluorescent in situ Hybridization on Mitotic Chromosomes of Mosquitoes
09:00

Fluorescent in situ Hybridization on Mitotic Chromosomes of Mosquitoes

Published on: September 17, 2012

26.3K
Observing Mitotic Division and Dynamics in a Live Zebrafish Embryo
10:10

Observing Mitotic Division and Dynamics in a Live Zebrafish Embryo

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Live Cell Imaging of Chromosome Segregation During Mitosis
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Live Cell Imaging of Chromosome Segregation During Mitosis

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科学分野:

  • 細胞生物学
  • 分子生物学
  • 遺伝学

背景:

  • ミトスの染色体は 細胞分裂に欠かせない とてもコンパクトな構造です
  • インターフェーズクロマチンがミトッククロモソームに改造される正確なメカニズムは,まだ完全に理解されていません.
  • クロマチンのループとコンデンシン複合体の役割は,染色体凝縮において極めて重要です.

研究 の 目的:

  • ミトスの染色体形成の段階的な経路を解明する.
  • ミトーシス中のクロマチンループの組織化におけるコンデンシン複合体の役割を調査する.
  • クロマチンの階層的な折り畳みをコンパクトなミトック構造に理解する.

主な方法:

  • 同期DT40細胞培養の生細胞イメージング
  • 高通量染色体構成捕捉 (Hi-C) 分析
  • クロマチン組織をモデル化するためのポリマーシミュレーション

主要な成果:

  • インターフェーズ組織は,60キロベース (kb) のループを形成するコンデンシンに依存したプロセスを介してプロフェーズで急速に失われます.
  • プロメタフェーズでは, ~80kbの内部ループと ~400kbの外部ループが生まれます.
  • クロマチンは,中央のコンデンシン・スキャフォルドの周りの螺旋状の配置を採用し,螺旋状のターンは ~ 12 メガベースまで拡大します.
  • コンデンシンIとコンデンシンIIの役割は異なっており,コンデンシンIIは螺旋巻きに不可欠である.

結論:

  • ミトスの染色体形成には,階層的なループネスティングと螺旋的な巻き込みプロセスが含まれています.
  • コンデンシン複合体,特にコンデンシンIIは,ミトーシス中のクロマチンの組織の重要な調節体である.
  • この研究は,初期ループ形成から大規模な螺旋構造まで,ミトスの染色体折り畳みの詳細な経路を明らかにしています.