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相关概念视频

Overview of Transposition and Recombination02:13

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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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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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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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相关实验视频

Updated: Jul 6, 2025

Agrobacterium-Mediated Immature Embryo Transformation of Recalcitrant Maize Inbred Lines Using Morphogenic Genes
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转录的增强剂序列是玉米p1转基因变异所需的.

Lyudmila V Sidorenko1,2, Vicki L Chandler1,3, Xiujuan Wang2,4

  • 1Department of Plant Sciences, The University of Arizona, Tucson, AZ 85721, USA.

Genetics
|January 3, 2024
PubMed
概括
此摘要是机器生成的。

玉米中的基因变异涉及P1-rr等位基因的遗传性沉默,由特定的DNA序列触发. 这些序列位于600bp段内,通过转录性变化和增加的DNA甲基化来实现沉默.

关键词:
通过DNA甲基化.直接的重复重复.增强剂是一种增强剂.玉米P1基因 玉米P1基因变态变异是一种变态变异.小小的RNARNA小小的RNARNA.转录 转录 是一种转录.通过转录性沉默来实现沉默.转基因是指转基因的人类.

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科学领域:

  • 植物遗传学 植物遗传学
  • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
  • 基因沉默是一种基因沉默.

背景情况:

  • 参突变是一种关键的表观遗传机制,涉及基因基因之间的遗传性沉默.
  • 众所周知,玉米P1-rr等位基因 (红色和红色) 当暴露于特定的转基因 (P1.2) 时会发生变异.
  • 之前的研究发现P1.2片段能够诱导二基突变,导致一个沉默的P1-rr'状态.

研究的目的:

  • 为了精确地识别P1.2碎片中的DNA序列,负责引起对突变.
  • 为了研究与P1基因中的基因突变过程相关的转录活性和表观遗传修饰.
  • 阐明增强剂重复在介导类突变中的作用.

主要方法:

  • P1.2片段的细分和转化为玉米.
  • 基因交叉来分析后代中的基因突变.
  • 使用α-amanitin灵敏度对转录的分析.
  • 小RNAs的量化. 小RNAs的量化.
  • 用DNA斑点分析检测细胞酸甲基化.

主要成果:

  • 在P1.2中确定了一个关键的~600-bp段为对变异至关重要.
  • 这段与P1-rr等位基因中存在的增强体重复重叠.
  • 寄生体细分的转录通过RNA聚合酶II在活性和沉默的等位基因中发生.
  • 在沉默的P1-rr'状态下,观察到小RNA的丰度增加和细胞因子甲基化的增强.
  • 证实P1-rr增强剂的重复会调解p1偏变异.

结论:

  • P1-rr增强剂重复是介导玉米p1变异的核心功能元素.
  • 参突变涉及RNA聚合酶II依赖转录,小RNA生产和DNA甲基化.
  • 在P1位点的表观遗传沉默是一个复杂的过程,由特定的DNA序列元素及其相关的分子机制调节.