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相关概念视频

Genome-wide Association Studies-GWAS01:11

Genome-wide Association Studies-GWAS

16.0K
Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
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Genome Annotation and Assembly03:36

Genome Annotation and Assembly

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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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Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Gene Conversion02:08

Gene Conversion

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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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相关实验视频

Updated: Feb 28, 2026

Detecting Somatic Genetic Alterations in Tumor Specimens by Exon Capture and Massively Parallel Sequencing
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特定于捐赠者的组件可以在复杂的基因组区域中增强体质结构变异检测.

Taralynn M Mack, Jiadong Lin, Luyao Ren

    bioRxiv : the preprint server for biology
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    与线性参考相比,捐赠者特定组件 (DSA) 显著改善了体质结构变异 (sSV) 的检测. DSA 识别出更多验证的 sSV,特别是在具有挑战性的重复区域,有助于基因组变异研究.

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    科学领域:

    • 基因组学就是基因组学.
    • 癌症基因组学 癌症基因组学
    • 生物信息学是一种生物信息学.

    背景情况:

    • 人体结构变异 (sSVs) 在基因组变异和疾病中至关重要.
    • 由于参考偏差,马赛克主义和重复区域,检测sSV具有挑战性.
    • 线性参考基因组 (例如,GRCh38,CHM13) 在捕捉个体基因组结构方面存在局限性.

    研究的目的:

    • 系统地评估用于sSV检测的供体特异组件 (DSAs) 的性能.
    • 通过使用多个sSV调用者和长读平台,将DSA实用程序与线性引用进行比较.
    • 评估在COLO829黑色素瘤细胞系中发现的sSV,使用匹配的DSA.

    主要方法:

    • 使用GRCh38,CHM13和COLO829BL_DSA. 的sSV检测进行了比较.
    • 采用了三个sSV调用器 (Delly,Severus,Sniffles2) 具有长读序列数据.
    • 在COLO829黑色素瘤细胞系与匹配的正常样本上的基准性能.

    主要成果:

    • COLO829BL_DSA发现手工验证的sSV比线性引用多1.8倍.
    • DSA在共同和独特的地区检测到sSV,包括难以解决的重复丰富的区域.
    • 在基因中发现了特定于DSA的sSV,其中一些与癌症有关.

    结论:

    • 特定于捐赠者的组件显著提高了sSV检测能力.
    • DSA是解决复杂结构变异的有价值工具,特别是在重复的基因组区域.
    • 使用DSA可以更好地发现与疾病相关的SSV.