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相关概念视频

Genetics of Speciation02:16

Genetics of Speciation

20.8K
Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
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Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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Gene Duplication and Divergence02:37

Gene Duplication and Divergence

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
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Gene Regulation During Sporulation01:17

Gene Regulation During Sporulation

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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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Seed Structure and Early Development of the Sporophyte02:33

Seed Structure and Early Development of the Sporophyte

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Seed structures are composed of a protective seed coat surrounding a plant embryo, and a food store for the developing embryo. The embryo contains the precursor tissues for leaves, stem, and roots. The endosperm and cotyledons—seed leaves—act as the food reserves for the growing embryo.
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相关实验视频

Updated: Jan 11, 2026

An Efficient Method for Quantitative, Single-cell Analysis of Chromatin Modification and Nuclear Architecture in Whole-mount Ovules in Arabidopsis
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An Efficient Method for Quantitative, Single-cell Analysis of Chromatin Modification and Nuclear Architecture in Whole-mount Ovules in Arabidopsis

Published on: June 19, 2014

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发育调节的基因驱动卵子进化中的家族基因分裂.

Veronica M Sondervan1,2, Gil Eshel1, Kranthi Varala3

  • 1Department of Biology, Center for Genomics and Systems Biology, New York University, New York, NY, USA.

Nature communications
|November 13, 2025
PubMed
概括

精子植物,古老的种子植物,持有种子进化的关键基因. 这项研究分析了他们的转录组,以发现影响主要植物进化分裂的基因,帮助种子基因发现和作物改进.

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A Method for Characterizing Embryogenesis in Arabidopsis
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Evaluation of Fertilization State by Tracing Sperm Nuclear Morphology in Arabidopsis Double Fertilization
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Evaluation of Fertilization State by Tracing Sperm Nuclear Morphology in Arabidopsis Double Fertilization

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An Efficient Method for Quantitative, Single-cell Analysis of Chromatin Modification and Nuclear Architecture in Whole-mount Ovules in Arabidopsis
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An Efficient Method for Quantitative, Single-cell Analysis of Chromatin Modification and Nuclear Architecture in Whole-mount Ovules in Arabidopsis

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科学领域:

  • 植物进化生物学 植物进化生物学
  • 基因组学就是基因组学.
  • 分子生物学分子生物学

背景情况:

  • 种子进化从根本上重塑了陆地生态系统和农业.
  • 作为最早的种子生长植物,高精子植物代表了一种有价值的,但尚未被充分探索的遗传资源,用于了解种子的发育.
  • 识别涉及种子演变的基因可以提供关于植物多样化和作物增强的见解.

研究的目的:

  • 探索体育种的基因组潜力,以发现对种子进化至关重要的基因.
  • 为了确定支持植物历史中的关键进化分歧的族群基因标记.
  • 发现和验证影响植物进化的新型卵子调节基因.

主要方法:

  • 深度转录基因组测序在14种体,4种血管和2种上进行.
  • 鉴定出了具有遗传学知识的正统学群.
  • 在卵子和叶子中进行了差异基因表达分析,以找到进化支持.
  • 候选基因在高精子卵子结构中得到验证.

主要成果:

  • 在研究的植物谱系中,确定了22,429个具有遗传学信息性的正统组.
  • 卵子和叶子中的差异表达基因为种子/非种子植物,体/血管和体内部的进化分裂提供了显著的支持.
  • 在Arabidopsis中未报告的候选卵子调节基因被使用体数据确定.
  • 发现了4,076个影响进化分裂的候选卵子基因,其表达在精子卵子中得到了验证.

结论:

  • 精苗转录组是发现参与种子进化的基因的丰富来源.
  • 卵子和叶子的基因表达模式对于理解主要的植物进化事件至关重要.
  • 这项研究为种子基因发现,植物保护工作和改善农作物提供了宝贵的资源.