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相关概念视频

Dihybrid Crosses01:18

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
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Seed Structure and Early Development of the Sporophyte02:33

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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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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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相关实验视频

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Determination of DNA Methylation of Imprinted Genes in Arabidopsis Endosperm
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绕过基因组印记允许种子发展.

Moritz K Nowack1, Reza Shirzadi, Nico Dissmeyer

  • 1University group at the Max Planck Institute for Plant Breeding Research, Max-Delbrück-Laboratorium, Department of Botany III, University of Cologne, Carl-von-Linné-Weg 10, D-50829 Cologne, Germany.

Nature
|May 1, 2007
PubMed
概括
此摘要是机器生成的。

父母基因组印记在开花植物中对于种子发育至关重要. 然而,FIS类基因的突变使得阿拉比多普西斯莉亚种子缺乏父子内精,可以发展成为较小的苗木,绕过致命性.

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科学领域:

  • 植物遗传学 植物遗传学
  • 发育生物学是发展生物学.
  • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.

背景情况:

  • 基因组印记,基于父母的基因表达差异,对于哺乳动物和植物胚胎发育至关重要.
  • 开花植物的印记缺陷通常会导致胚胎死亡,特别是影响内的发育,它滋养胚胎.
  • 已知编码Polycomb组染色体修饰因子的FIS类基因参与了印记机制.

研究的目的:

  • 调查是否可以绕过在Arabidopsis thaliana种子中的印记,以允许从单亲母源的种子中发展.
  • 确定FIS类基因在调节父基因组对内的贡献中的作用.
  • 探索FIS基因作用在双重受精和内精子发育的背景下对FIS基因的进化影响.

主要方法:

  • 阿拉比多普西斯·塔利亚纳 (Arabidopsis thaliana) 种子的生成与单亲 (母) 内精.
  • 在缺少父子内贡献的种子中分析幼苗的生存能力和发育.
  • 利用FIS类基因中的突变来评估它们对印记绕道和种子发育的影响.

主要成果:

  • 可行的,虽然较小的,幼苗可以从阿拉比多普西斯塔利亚娜的种子中发展,而这种种子缺乏对内精子的父性贡献.
  • 只有当母植物对FIS类基因发生突变时,才能绕过印记和随后的发展.
  • FIS类基因对于平衡父亲基因组对内精子的贡献至关重要,防止致命性.

结论:

  • FIS复合体在调节基因组印记和通过平衡父母基因组贡献来确保适当的种子发育方面发挥着关键作用.
  • 开花植物的双重受精的进化可能需要FIS基因的作用来培育种子.
  • 这些发现支持了开花植物内的体质起源,与早期假设保持一致.