SARS-CoV-2 の宿主内の多様性と伝播
Katrina A Lythgoe1,2, Matthew Hall1, Luca Ferretti3
1Big Data Institute, Nuffield Department of Medicine, University of Oxford, Old Road Campus, Oxford OX3 7LF, UK. Tanya.Golubchik@bdi.ox.ac.uk Katrina.Lythgoe@bdi.ox.ac.uk Matthew.Hall@bdi.ox.ac.uk.
まとめ
重症急性呼吸器症候群コロナウイルス2型 (SARS-CoV-2型) は個体内で稀に発生するが,感染すると急速に広がる. SARS-CoV-2の伝播は狭いボトルネックで,多様性の持続性を制限します.
科学分野:
- ウイルス学
- ゲノミクス
- 流行病学
背景:
- SARS-CoV-2のグローバルシーケンシングは,ウイルスの拡散を追跡し,新しい変種を特定します.
- 変異の拡散は宿主内の発生頻度と伝播効率に依存する.
- ホスト内の多様性と伝播のボトルネックを理解することは,パンデミックへの対応に不可欠です.
研究 の 目的:
- SARS-CoV-2の宿主内の遺伝的多様性を特徴付ける.
- SARS-CoV-2の感染ボトルネックを調査する.
- 新型SARS-CoV-2の急速な拡散の可能性を評価する.
主な方法:
- イギリスの1313件の臨床SARS-CoV-2サンプルを深層解析した.
- 伝播中の変異パターンを観察する 系統遺伝分析
- 宿主内のウイルスの多様性の定量化
主要な成果:
- SARS-CoV-2 感染症は,高いウイルス負荷の間,宿主内の多様性が低い.
- SARS-CoV-2の伝播は狭いボトルネックで特徴付けられています.
- ほとんどの変種は伝播中に失われ,共有された多様性の持続は最小限です.
- 系統遺伝パターンはこれらの伝播ダイナミクスを反映している.
結論:
- SARS-CoV-2の伝播強化型または免疫回避型変種は,まれに発生する可能性が高い.
- このような変種が成功すれば 急速に広がる可能性があります
- 狭い感染ボトルネックがSARS-CoV-2の進化軌道を形作っている.
関連する概念動画
Single Nucleotide Polymorphisms-SNPs
17.3K
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,...
17.3K
Viral Recombination
24.4K
Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
24.4K
Types of Genetic Transfer Between Organisms
5.9K
5.9K
Types of Genetic Transfer Between Organisms
30.0K
Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.
30.0K
Infection
9.9K
When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
9.9K
Mutation, Gene Flow, and Genetic Drift
60.8K
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).
60.8K


