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関連する概念動画

Genome-wide Association Studies-GWAS01:11

Genome-wide Association Studies-GWAS

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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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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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Genetic Screens02:46

Genetic Screens

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Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
Forward genetic screens
Forward or “classical” genetic screens involve creating random mutations in an organism’s DNA using radiation, mutagens, or insertion of additional bases, which...
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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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Incomplete Dominance01:43

Incomplete Dominance

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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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関連する実験動画

Updated: Sep 9, 2025

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
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アラブ人集団における希少疾患の原因となる病原性多様性:スクリーニングプログラムへの影響

Ruchi Jain1, Sami Bizzari2, Sathishkumar Ramaswamy1

  • 1Dubai Health Genomic Medicine Center, Dubai Health, Dubai, United Arab Emirates.

Genetics in medicine open
|September 2, 2025
PubMed
まとめ

アラブ人の稀な病気の原因となる 遺伝的変異はあまり研究されていません この研究は,この集団における後退性疾患のスクリーニングを改善するために,重要な遺伝的変異体とキャリア率を特定します.

キーワード:
血縁関係エクソームシーケンシング遺伝的変異中東珍しい遺伝疾患

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In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
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In Vivo Modeling of the Morbid Human Genome using Danio rerio
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In Vivo Modeling of the Morbid Human Genome using Danio rerio

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Last Updated: Sep 9, 2025

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
07:15

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科学分野:

  • 遺伝学
  • 人口の健康
  • 医学ゲノミクス

背景:

  • アラブ人集団における 希少疾患の遺伝的多様性は 十分に理解されていません
  • アラブ人の血縁関係が高ければ 衰退性疾患の流行が増加します
  • 有限なデータは 遺伝病の有効なキャリアスクリーニング戦略を阻害しています

研究 の 目的:

  • アラブ・エミレーツの家族における病原性 (P) と病原性 (LP) の可能性のある変種を特定し,特徴づけること.
  • アレル頻度を計算し,エミレーツの人口の衰退状態のキャリア率を推定する.
  • 稀有病の有毒者検診プログラムの開発を図る

主な方法:

  • アラブ・エミレーツの1333の家庭からのP/LPのバリエーション (内部コホートと文献)
  • アメリカン・カレッジ・オブ・メディカル・ジェネティクス・アンド・ゲノミクス/アソシエーション・フォー・モレキュラー・パトロジーによる変種分類ガイドライン.
  • アレル周波数とキャリア率を決定するために1194のEmiratiエクソムのP/LP変種を分析した.

主要な成果:

  • 1060のファミリーで701のP/ LPの変種が特定され,52%がgnomADから,30%がClinVarから欠けていた.
  • CYP21A2は最も高いキャリア率 (10.6%) を示し,次にHBB (9.6%),MEFV (5.9%) とABCA4 (4.3%) が続いた.
  • 暫定的なスクリーニング遺伝子リストに基づいたリスクカップルの割合は4%から21%です.

結論:

  • 公共衛生のイニシアチブのために,代表が不足している集団の流行病を特定する必要性を強調します.
  • 結婚前のスクリーニングを含む公平な予防措置の開発の重要性を強調しています.
  • 有効なキャリアスクリーニングのための集団特有の遺伝データの有用性を強調します.