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関連する概念動画

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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Karyotyping01:17

Karyotyping

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Overview
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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...
4.5K
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

6.5K
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
6.5K
Centrosome Duplication02:25

Centrosome Duplication

4.1K
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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Polytene Chromosomes02:04

Polytene Chromosomes

10.2K
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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Updated: Sep 2, 2025

Author Spotlight: Characterizing DNA Replication of Pathogenic Repeats to Uncover Mechanisms of Replication Fork Stalling and Expansion
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リピートベースのホロセントロメアがゲノム構造とカリオタイプ進化に影響を与える

Paulo G Hofstatter1, Gokilavani Thangavel1, Thomas Lux2

  • 1Department of Chromosome Biology, Max Planck Institute for Plant Breeding Research, Cologne, NRW 50829, Germany.

Cell
|August 4, 2022
PubMed
まとめ

セントロメア型はゲノム構造と進化に影響する. ホロセントロメアは全染色体に沿って ゲノム構造を再構成し,染色体融合を通して 型進化を促します

キーワード:
リンコスポラセントロメアディスプロイジアゲノム制御ホロセントリック染色体空間的なゲノム組織適用可能な要素全ゲノム複製

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Hi-C: A Method to Study the Three-dimensional Architecture of Genomes.
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科学分野:

  • ゲノミクス
  • 進化生物学
  • 細胞遺伝学

背景:

  • ほとんどの真核生物は,単一のセントロメアを持つ単一中心の染色体を持っています.
  • ホロセントリック染色体は,全長にセントロメアがあり,いくつかの植物や動物の系統に存在する.
  • セントロメア型がゲノム組織と進化に与える影響を理解することは極めて重要です.

研究 の 目的:

  • ゲノム組織と進化をセントロメア型と比較する.
  • (Rhynchospora spp.) の反復性ホロセントロメアの役割を調査する. そして,その一心的な親戚 (Juncus effusus).
  • ホロセントリシティへの移行が3Dゲノム構造とカリオタイプ進化にどのように影響するか解明する.

主な方法:

  • クロモソームスケールのゲノムを組み立て, 3つのビックセージ種と1つの単一中心の親類.
  • 3Dゲノム構造とセントロメア分布を含むゲノム組織の分析.
  • カリオタイプ進化と染色体数減少/融合を研究するための比較ゲノミクス.

主要な成果:

  • ホロセントリシティは3Dゲノムアーキテクチャを ゲノムコンパートメントを変えることで 再定義しました
  • セントロメア機能は,ホロセントリックな種でゲノム全体に何千もの繰り返しベースの単位に分布しています.
  • Rhynchospora puberaは複合的なゲノム組織を示し,オクトプロイド性を示し,R. tenuisは染色体数が減少している (染色体2つ).
  • クロモゾーム融合は,繰り返しベースのホロセントロメアによって促進され,カリオタイプ進化と二重化の主な原動力であった.

結論:

  • セントロメア型はゲノム構造と進化の軌道を大きく影響する.
  • リピートベースのホロセントロメアは染色体融合を促進し,カリオタイプ多様化と安定性に寄与する.
  • この研究は,多様なセントロメア組織によって形成されたゲノム進化の洞察を提供します.