马来西亚沙巴的SARS-CoV-2传播时间表:追踪分子进化
Krishnan Nair Balakrishnan1, Chee Wei Yew1, Eric Tzyy Jiann Chong1
1Biotechnology Research Institute, Universiti Malaysia Sabah, Jalan UMS, Kota Kinabalu 88400, Sabah, Malaysia.
Pathogens (Basel, Switzerland)
|August 25, 2023
概括
沙巴的分子流行病学显示,到2022年12月,GRA基团将占主导地位. 这项研究追踪了来自马来西亚半岛的SARS-CoV-2变种的演变,包括来自马来西亚半岛的Delta和Omicron.
科学领域:
- 病毒学 病毒学
- 流行病学 流行病学
- 基因组学就是基因组学.
背景情况:
- 在马来西亚,COVID-19是一个重大的公共卫生挑战,萨巴州的死亡率不成比例.
- 对沙巴的分子流行病学数据有限,这阻碍了对这个地理上独特地区的SARS-CoV-2变种多样性和演变的理解.
研究的目的:
- 为了调查主要的SARS-CoV-2变种和新出现的突变在马来西亚婆罗洲沙巴.
- 分析SARS-CoV-2在沙巴的分子流行病学和进化轨迹.
主要方法:
- 583个COVID-19样本的全基因组测序,补充了GISAID的1123个现有序列.
- 使用Nextclade和Pangolin对类和系进行序列分类.
- 贝叶斯时间尺度的基因分析与最大概率算法来确定分子进化特征.
主要成果:
- 沙巴的早期SARS-CoV-2序列属于O类,后来被G,GH,GK类取代,到2022年12月,主要是GRA类.
- 德尔塔变种分离物被分为21A,21J和21I分类;欧米克朗分离物分为21M,21L和22B.
- 遗传学分析表明,SARS-CoV-2在2020年3月初从半岛马来西亚引入萨巴,病毒传播和演变的不同阶段.
结论:
- 持续的分子流行病学对于了解沙巴的变种出现和主导至关重要.
- 这些知识有助于针对性的公共卫生干预,以控制COVID-19的传播.
相关概念视频
00:36Viral Mutations
32.4K
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
32.4K
01:05Single Nucleotide Polymorphisms-SNPs
15.3K
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,...
15.3K