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相关概念视频

Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
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The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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一个太平洋祖先 Pangenome 参考草案.

Connor Littlefield, Jose M Lazaro-Guevara, Devorah Stucki

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    此摘要是机器生成的。

    研究人员从23个个体中创建了第一个太平洋祖先泛基因组参考. 这种基因组资源改善了太平洋地区种群的变异调用准确性,解决了遗传研究中的代表性不足问题.

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    科学领域:

    • 基因组学就是基因组学.
    • 人口遗传学 人口遗传学
    • 生物信息学是一种生物信息学.

    背景情况:

    • 太平洋血统的个人面临着严重的健康差异.
    • 基因组研究,包括参考基因组,缺乏来自太平洋人口的代表性.

    研究的目的:

    • 开发了第一个太平洋祖先的泛基因组参考基因组.
    • 改进基因组分析,减少这一群体的健康差异.

    主要方法:

    • 组装了来自23个不同太平洋祖先的个体的46个平分类基因组.
    • 创建了一个包含新奇序列的泛基因组引用.
    • 与现有引用 (HPRC,T2T-CHM13) 相比的变体调用精度.

    主要成果:

    • 实现了高度准确和连续的基因组组件 (平均每小时) 质量值为55.0,每年平均值为55.0. N50 40.7 Mb) 的时间.
    • 添加了30.6 Mb的新型序列,这些序列不在人类泛基因组参考联盟 (HPRC) 的参考中.
    • 通过使用新的泛基因组,证明了变异调用错误减少和真正变异增加.

    结论:

    • 开发的太平洋祖先泛基因组参考文献增强了对服务不足的人口的遗传分析.
    • 这个资源对于理解太平洋祖先个体健康差异的遗传基础至关重要.