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相关概念视频

Chromosome Structure02:40

Chromosome Structure

24.8K
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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Chromosome Structure02:40

Chromosome Structure

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Karyotyping01:17

Karyotyping

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Overview
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Synteny and Evolution02:31

Synteny and Evolution

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...
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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

6.9K
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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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: Nov 9, 2025

Generation and Purification of Human INO80 Chromatin Remodeling Complexes and Subcomplexes
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Generation and Purification of Human INO80 Chromatin Remodeling Complexes and Subcomplexes

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一个完整的人类染色体的结构,功能和演变

Glennis A Logsdon1, Mitchell R Vollger1, PingHsun Hsieh1

  • 1Department of Genome Sciences, University of Washington School of Medicine, Seattle, WA, USA.

Nature
|April 8, 2021
PubMed
概括

研究人员已经完全组装了人类8号染色体,解决了关键的缺口,包括中心卫星DNA和可变重复. 这为灵长类动物的中心分子功能和进化提供了新的见解.

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科学领域:

  • 基因组学
  • 人类生物学
  • 进化生物学

背景情况:

  • 完整的染色体组合对于理解人类生物学和进化至关重要.
  • 之前的组合有显著的差距,特别是在复杂的区域,

研究的目的:

  • 为了实现人类8号染色体的完整线性组合.
  • 解决以前未被描述的基因组区域,并了解中粒体结构和功能.
  • 重建灵长类染色体8的进化历史.

主要方法:

  • 使用互补的长读测序技术.
  • 完成了对α卫星阵列的详细分析,包括甲基化模式.
  • 在大猿和身上使用对正体体的比较和遗传学分析.

主要成果:

  • 成功解决了人类8号染色体组合中的五个长期缺口.
  • 标志着一个大型的中心系α卫星阵列,其甲基化模式,以及一个低甲基化的CENP-A丰富区域.
  • 揭示了高阶α卫星结构的进化历史.
  • 与独特的基因组区域相比,在中心卫星DNA中发现了加速的突变率.

结论:

  • 人类8号染色体的完整组合提供了其复杂区域的高分辨率视图.
  • 中介质结构和甲基化模式保留,但动态演变.
  • 卫星DNA表现出加速的进化,影响基因组可塑性和灵长类动物的进化.