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相关概念视频

Exon Recombination02:32

Exon Recombination

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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
Exon shuffling follows “splice frame rules.” Each exon...
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Gene Conversion02:08

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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Crossing Over01:30

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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
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The Ratio of X Chromosome to Autosomes02:45

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In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
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Dosage Compensation02:50

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In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with  distinct numbers of X chromosomes will...
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相关实验视频

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Identification of Homologous Recombination Events in Mouse Embryonic Stem Cells Using Southern Blotting and Polymerase Chain Reaction
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性别特定的进化程序塑造了家庭小鼠的重组率进化.

Lydia K Wooldridge1, Micah Pietraho1, Peyton DiSiena1

  • 1The Jackson Laboratory, 600 Main Street, Bar Harbor, ME 04609, United States.

Genetics
|November 14, 2025
PubMed
概括

在室内小鼠 (Mus musculus) 中,雄性重组率显示出强烈的进化信号,与雄性不同,与雌性不同. 有证据表明,在M. m. musculus亚种系中,雄性重组的适应性增加.

关键词:
遗传冲突 遗传冲突家庭小鼠 家庭小鼠遗传学上的比较方法.复合率是指复合率是指复合率.两性二态性质的性别二态性.

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科学领域:

  • 进化生物学是进化的生物学.
  • 遗传学 遗传学 是一个
  • 进行比较的基因组学.

背景情况:

  • 重组率在物种,种群和性别之间表现出显著的差异.
  • 室内小鼠 (Mus musculus) 在重组率上表现出极大的差异,雄性比雌性更有差异.
  • 性别限制的变异表明,在M. musculus中,男性和女性的重组率存在着不同的进化机制.

研究的目的:

  • 为了正式评估不同的进化机制的假设,用于男性和女性的重组率在肌肉肌肉,使用一个家族遗传框架.
  • 调查Mus物种和M. musculus亚种中性别特异性重组率的遗传分布和进化史.

主要方法:

  • 从6000多个介质细胞中编制了大量的性别特定交叉率估计数据集.
  • 包括来自31个基因多样化的同胞生育小鼠菌株的数据,分别来自5个Mus物种和4个M. musculus亚种.
  • 结合了细胞遗传学估计与已公布的数据进行遗传学分析.

主要成果:

  • 男性的重组率显示出强烈的家族遗传信号 (HP2 = 0.82),由Mus家族遗传学预测得很好.
  • 女性的重组率表现出较弱的遗传学信号 (HP2 = 0.24).
  • 与其他M. musculus亚种雄性相比,M. m. musculus雄性表现出明显的重组率增加,有适应性血统特异性进化的证据.

结论:

  • 在室内小鼠中,重组率的进化是由不同的性别特异性的进化模式所支配的.
  • 这些发现支持了男性和女性重组率存在单独进化途径的假设.
  • 激励未来研究性别特异性选择性压力和影响重组的遗传架构.