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相关概念视频

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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
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Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...
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Regulation of Expression Occurs at Multiple Steps02:24

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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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相关实验视频

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Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps
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随机基因表达和环境压力因素触发了可变的索米特细分表型.

Kemal Keseroglu1, Oriana Q H Zinani1,2, Sevdenur Keskin3

  • 1Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA.

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概括
此摘要是机器生成的。

静态基因表达,而不仅仅是修饰者,在她的1或她的7突变胚胎中引起可变细分缺陷. 低温和低氧等环境因素通过降低振荡幅度来加剧这些缺陷.

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科学领域:

  • 发展生物学 发展生物学
  • 遗传学 是一个遗传学.
  • 分子生物学分子生物学

背景情况:

  • 在遗传突变中,不完全的透率和可变的表达性往往归因于修饰基因或环境因素.
  • 驱动发育过程中的表型变异的精确机制仍然不完全理解.

研究的目的:

  • 为了研究随机基因表达在变量索米特细分缺陷中所起的作用,在细分钟基因突变的胚胎中观察到细分缺陷 (her1, her7).
  • 为了确定环境条件 (低温,低氧) 对这些细分缺陷的严重程度的影响.

主要方法:

  • 在她的1和她的7个突变胚胎中利用了细分钟记者的实时成像.
  • 量化分析了与索米特形成相关的分段时钟记者的振荡幅度.
  • 评估了低温和缺氧对细分时钟动态和结果的影响.

主要成果:

  • 基因表达的随机变化,特别是细分时钟振荡,与某些细分缺陷的变化直接相关.
  • 具有较高细分时钟振荡幅度的胚胎在形成索米特方面更成功.
  • 低温和缺氧加剧了细分缺陷,由于高振幅振荡周期的比例下降和成功的细分.

结论:

  • 随机基因表达,以振荡幅度的波动为特征,是她1/她的7个突变胚胎中可变细分缺陷的主要驱动因素.
  • 低温和缺氧等环境压力因素通过破坏必要的振荡幅度值来放大这些缺陷.
  • 开发的定量方法为研究其他基因突变和组织中的可变表型提供了一个框架.