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相关概念视频

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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Centrosome Duplication02:25

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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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Histone Variants at the Centromere02:30

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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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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
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Centrioles and Centrosomes01:13

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Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
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在棉花中,多聚化后的中心体进化.

Hu Yan1, Jinlei Han2, Shangkun Jin1

  • 1Zhejiang Provincial Key Laboratory of Crop Genetic Resources, the Advanced Seed Institute, Plant Precision Breeding Academy, College of Agriculture and Biotechnology, Key Laboratory of Plant Factory Generation-adding Breeding, Ministry of Agriculture and Rural Affairs, Zhejiang University, Hangzhou, China.

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PubMed
概括
此摘要是机器生成的。

高地棉花 (Gossypium hirsutum) 的一个完整的端粒对端粒 (T2T) 基因组组合揭示了中粒体的进化. 与中间体相关的重复序列 (CRC) 被转移和扩散,在多重化后塑造了动态的中间体景观.

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科学领域:

  • 基因组学就是基因组学.
  • 植物生物学 植物生物学
  • 进化生物学 进化生物学

背景情况:

  • 高地棉花 (Gossypium hirsutum) 是一种重要的四植物作物,占全球产量的90%以上,是多动物化的典范.
  • 了解多倍种作物的基因组架构和演变对于农业的进步至关重要.

研究的目的:

  • 为了生成一个完整的端粒到端粒 (T2T) 基因组组合的高地棉花 (Gossypium hirsutum) 加入德克萨斯标记-1 (T2T-TM-1).
  • 调查高地棉花中物种间的中间体分歧和中间体相关的重复序列 (CRC) 的动态.

主要方法:

  • 高质量的端粒到端粒 (T2T) 基因组测序和高地棉花 (Gossypium hirsutum) T2T-TM-1的组装.
  • 对比基因组学分析,以检测子基因组和双胞胎祖先之间的中间体分歧.
  • 生物信息学分析与中心分子相关的重复序列 (CRC) 和它们的进化历史.

主要成果:

  • 实现了高地棉花 (T2T-TM-1) 的全面T2T基因组组合,总计2,299.6 Mb,有79,642个注释基因.
  • 在A-和D-亚基因组及其双胞胎祖先之间确定了跨种类的中间体分离.
  • 与中心粒相关的重复序列 (CRCs),富含吉普赛式的反元素,表现出扩张,重新定位和多重化后的结构变异,有从D基因组祖先转移和扩散的证据.

结论:

  • 完整的T2T基因组组合为高地棉花研究提供了基础资源.
  • 高地棉花的中粒体进化以动态变化和CRCs的重要作用为特征,特别是来自D基因组祖先的CRCs.
  • 这些发现提供了对塑造多倍体物种中心层景观的进化机制的见解.