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関連する概念動画

Yeast Signaling01:28

Yeast Signaling

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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...
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Histone Variants at the Centromere02:30

Histone Variants at the Centromere

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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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Gene Regulation During Sporulation01:17

Gene Regulation During Sporulation

346
Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
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Centrosome Duplication02:25

Centrosome Duplication

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The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
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Meiosis I01:49

Meiosis I

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Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
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Meiosis I03:09

Meiosis I

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Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
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関連する実験動画

Updated: Dec 19, 2025

Use of Time-Lapse Microscopy and Stage-Specific Nuclear Depletion of Proteins to Study Meiosis in S. cerevisiae
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収束遺伝子は芽生えた酵母の周心体を形作る

Flora Paldi1, Bonnie Alver1, Daniel Robertson1

  • 1The Wellcome Centre for Cell Biology, Institute of Cell Biology, School of Biological Sciences, University of Edinburgh, Edinburgh, UK.

Nature
|June 5, 2020
PubMed
まとめ

芽生えた酵母細胞は ゲノム構造と機能を構成する. 収束遺伝子とコヘシン位置付けはこれらの領域を形成し,ミトーシス中に適切な染色体分離を保証します.

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Microscopy of Fission Yeast Sexual Lifecycle
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Examination of Mitotic and Meiotic Fission Yeast Nuclear Dynamics by Fluorescence Live-cell Microscopy
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関連する実験動画

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科学分野:

  • ゲノミクス
  • 分子生物学
  • 細胞生物学

背景:

  • 3次元のゲノム構造は その維持,発現,伝播に不可欠です
  • コヘシンタンパク質複合体は,遠隔の位置を結びつけることでゲノムを組織し,ペリセントロメアで濃縮されます.

研究 の 目的:

  • 芽生えた酵母 (Saccharomyces cerevisiae) の3D構造を解明する.
  • パーシントロメアゲノム組織と細胞機能,特に染色体分離との関係を確立する.

主な方法:

  • Saccharomyces cerevisiaeの3D構造を調べました
  • パーシントロメア構造と機能の定義における収束遺伝子の役割とコヘシンを分析した.
  • ゲノム再指向がペリセントロメア組織と染色体の生物指向に与える影響を調査した.

主要な成果:

  • コア・セントロメアと共にペリセントロメアの境界にある収束遺伝子は,構造と位置の凝結を定義する.
  • ペリセントロメアは基底に境界遺伝子が付いているループ形をとり,マイクロチューブルの付着がこれらのループを拡張する.
  • 境界遺伝子の再定位はコヘシン定位を損ね,ペリセントロメアを拡大し,染色体の生物定位を乱します.

結論:

  • 遺伝子の線形配列と標的型コヘシン負荷は,有能な染色体分離のためにペリセントロメアを形作る.
  • 微小管の結合は 周囲の構造を再構成する
  • 3Dゲノム組織と細胞機能の間の直接的な因果関係は存在します.