相关实验视频
Updated: Jun 1, 2025
09:40
Novel Sequence Discovery by Subtractive Genomics
Published on: January 25, 2019
8.6K
在韩国使用全基因组测序揭示了一种新的GI-19系传染性支气管炎病毒亚基因型,具有多重重组合
Ji-Ye Kim1, Hoang Duc Le2, Tuyet Ngan Thai1
1Avian Disease Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Gyeongsangbuk-do, Republic of Korea.
概括
韩国的新型传染性支气管炎病毒 (IBV) 株,属于GI-19血统,经过基因鉴定. 确定了新的K-IIe亚基因型和复杂的重组模式,影响IBV进化和控制策略.
科学领域:
- 兽医病毒学 兽医病毒学
- 分子流行病学分子流行病学
- 禽类的健康 禽类的健康
背景情况:
- 传染性支气管炎 (IB) 是一种由传染性支气管炎病毒 (IBV) 引起的高度传染性病,导致全球经济重大损失.
- 新IBV菌株和变种的出现挑战了现有的控制策略,包括非活化和活衰减疫苗.
研究的目的:
- 在2003年至2024年期间,从韩国商业群中分离出的46种IBV菌株进行测序和遗传特征.
- 为了确定新的IBV亚基因型,并分析韩国II组 (K-II) 血统中的重组模式.
主要方法:
- 从46个IBV分离物中测序S1基因.
- 遗传树分析和核酸鉴定用于遗传特征.
- 使用下一代测序对新型K-IIe分离物的全基因组测序.
主要成果:
- 在GI-19血统中,IBV分离物被归类为韩国II组 (K-II),分为五个子基因组 (K-IIa-e).
- K-IId是最常见的基因型,但发现了八种新的K-IIe分离物.
- 在8个K-IIe分离物中,有6个被确定为重组物,在nsp2,S2和M基因中存在断点,其中一些涉及疫苗菌株.
结论:
- 针对在韩国普遍存在的GI-19血统中的K-IIIBV菌株提出了新的分类标准.
- 在新发现的IBV分离物中揭示了复杂的重组模式,为病毒进化提供了洞察力.
- 提供了关于IBV新型亚基因型及其遗传动态的关键信息,以改善疾病管理.
相关概念视频
00:57Viral Recombination
23.2K
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.
23.2K
00:36Viral Mutations
32.1K
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...
32.1K
01:05Single Nucleotide Polymorphisms-SNPs
13.9K
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,...
13.9K
02:32Exon Recombination
3.5K
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...
Exon shuffling follows “splice frame rules.” Each exon...
3.5K