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相关概念视频

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...
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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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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...
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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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Polytene Chromosomes02:04

Polytene Chromosomes

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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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相关实验视频

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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基于重复的全中心体影响基因组结构和型进化

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
概括

中介体类型影响基因组结构和进化. 在整个染色体中发现的全中染色体,重塑了3D基因组架构,并通过染色体融合驱动型进化.

关键词:
虫虫中心分子失足症基因组调节全中心染色体空间基因组组织可转移的元素全基因组复制

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Deciphering High-Resolution 3D Chromatin Organization via Capture Hi-C
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科学领域:

  • 基因组学
  • 进化生物学
  • 细胞遗传学

背景情况:

  • 大多数真核生物具有单中心染色体和单中心体.
  • 在一些植物和动物系中,全中性染色体具有整个长度的中体.
  • 了解中粒体类型对基因组组织和进化的影响至关重要.

研究的目的:

  • 为了比较基因组组织和与中心体类型相关的进化.
  • 调查基于重复的全中心体在 (Rhynchospora spp.) 中的作用 和它们的单中心亲属 (Juncus effusus).
  • 阐明向全心转变如何影响3D基因组结构和型进化.

主要方法:

  • 三种甲和一个单中心亲属的染色体尺度基因组组.
  • 基因组组织的分析,包括3D基因组架构和中间体分布.
  • 比较基因组学研究型进化和染色体数量减少/融合事件.

主要成果:

  • 通过改变基因组区块, 重新定义了三维基因组结构.
  • 在全中心物种中,基因组中分布着成千上万个基于重复的单元.
  • 青春期脊髓菌表现出复杂的基因组组织,揭示了八倍体性;R. tenuis表现出减少的染色体数量 (两个染色体).
  • 基于重复的全中心体促进的染色体融合是型进化和二倍化的主要驱动因素.

结论:

  • 中介体类型对基因组架构和进化轨迹有深远的影响.
  • 基于重复的全中心体促进染色体融合,有助于型的多样化和稳定性.
  • 这项研究提供了由多种中心分子组织塑造的基因组进化.