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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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Leaky Scanning02:28

Leaky Scanning

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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From DNA to Protein03:06

From DNA to Protein

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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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The Central Dogma01:20

The Central Dogma

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The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
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The Central Dogma01:25

The Central Dogma

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Overview
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Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

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Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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In Vitro Selection of Aptamers to Differentiate Infectious from Non-Infectious Viruses
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In Vitro Selection of Aptamers to Differentiate Infectious from Non-Infectious Viruses

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SARS-CoV-2のコーディング能力

Yaara Finkel1, Orel Mizrahi1, Aharon Nachshon1

  • 1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel.

Nature
|September 9, 2020
PubMed
まとめ

研究者は,SARS-CoV-2の完全なタンパク質レパートリーをマッピングし,23の新しいウイルスオープンリーディングフレーム (ORF) を特定しました. この詳細な地図は,新型コロナウイルス病 2019 (COVID-19) の病原性および治療開発の理解を助けます.

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Last Updated: Dec 9, 2025

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科学分野:

  • ウイルス学
  • 分子生物学
  • ゲノミクス

背景:

  • 重症急性呼吸器症候群コロナウイルス2型 (SARS-CoV-2型) がCOVID-19のパンデミックを引き起こす.
  • SARS-CoV-2のタンパク質発現を理解することは,治療薬の開発に不可欠です.
  • 現在のタンパク質マップは予測とホモロジーに依存しており,直接的な特徴づけが必要である.

研究 の 目的:

  • SARS-CoV-2のコード領域の高解像度マップを作成する.
  • 新型を含む全ての発現したウイルスタンパク質を特定し,定量化する.
  • 宿主細胞に対するウイルスの翻訳効率を理解する.

主な方法:

  • リボソームプロファイリングの 技術を活用した
  • SARS-CoV-2 ゲノムの偏見のない,オープンな特徴づけを行った.
  • 定量化された正規のおよび注釈されていないウイルスのオープン・リーディングフレーム (ORF) の表現.

主要な成果:

  • SARS-CoV-2のコード領域の高解像度マップを生成しました.
  • 制御性および新型ポリペプチド生成性ORFを含む,これまでに注釈されていない23のウイルスORFが特定されました.
  • 高いウイルスのトランスクリプトレベルが 効率の向上ではなく 支配的なウイルスのトランスレーションを 誘導することを示した.

結論:

  • この研究は,SARS-CoV-2に対する包括的なタンパク質レパートリーマップを提供します.
  • 新たに特定された新型ウイルスのORFは,機能研究と治療標的化のための新たな道を開く.
  • この発見は,病原性を理解するために不可欠なウイルスの翻訳動態を明確にします.