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相关概念视频

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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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After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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Transposons, or "jumping genes," are small mobile genetic elements (MGEs) that range from 700 to 40,000 base pairs in length. They are found in all organisms and can move within the same chromosome or transfer to different chromosomes. In some cases, transposons can also jump between different host DNA molecules, such as plasmids or viruses, contributing to genetic variability.Barbara McClintock first discovered these mobile genetic elements in the 1940s while studying maize genetics, and she...
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LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
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人类胚胎囊中的可转移元素的组成动态.

Jian Li1, Ping Yuan2,3, Guangwei Ma4

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概括

人类胚芽细胞中可移植元素 (TE) 的比例受到父母遗传背景和胚胎发育阶段的显著影响. 这些移动DNA序列在早期发育过程中显示出动态变化.

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科学领域:

  • 遗传学 遗传学 是一个
  • 发展生物学 发展生物学
  • 基因组学就是基因组学.

背景情况:

  • 可转移元素 (TE) 是移动DNA序列,对基因组进化和调节至关重要.
  • 在胚胎发育和染色体结构中,TEs起作用,但它们在人体胚胎囊中的变异尚未完全理解.

研究的目的:

  • 根据父母的遗传背景和发育阶段,研究人类胚芽细胞中可移植元素 (TE) 的变异.
  • 为了确定特定的TE子家族,受父母的型,胚胎囊阶段和状况的影响.

主要方法:

  • 在196个胚胎囊中,在DNA层面上对6个类别的1137个TE子家族进行了分析.
  • 使用Bowtie2和PopoolationTE2进行TE比例分析.
  • 相关的TE频率与父母的型,胚胎细胞的发育阶段,和 ploidy 状态.

主要成果:

  • 家长的型是影响TE频率的主要因素,有1116个子家族显示变化.
  • 胚芽细胞发育阶段是影响614个子家族的第二个最关键因素.
  • 特定的TE家族,如Alu和LINE在不同胚胎细胞阶段 (例如第6阶段和第3阶段) 显示出不同的比例.
  • TE亚家族的比例也因胚胎细胞核型 (平衡或不平衡),内细胞质量和外层皮状况而有所不同.

结论:

  • 在人类胚胎发育过程中,TE亚家族的组成是动态调节的.
  • 父母遗传背景和发育阶段显著塑造了胚胎细胞中TE景观.
  • TE变异可以作为胚胎健康和发育潜力的指标.