相关实验视频

Updated: May 9, 2025

Analysis of HBV-Specific CD4 T-cell Responses and Identification of HLA-DR-Restricted CD4 T-Cell Epitopes Based on a Peptide Matrix

Analysis of HBV-Specific CD4 T-cell Responses and Identification of HLA-DR-Restricted CD4 T-Cell Epitopes Based on a Peptide Matrix

Published on: October 20, 2021

关于HLJDZD55的基因组表征:中国的第一个L1BPRRSV

Jinhao Li¹, Hu Xu¹, Chao Li¹

¹State Key Laboratory for Animal Disease Control and Prevention Harbin Veterinary Research Institute Chinese Academy of Agricultural Sciences Harbin 150001China.

Transboundary and emerging diseases

|April 30, 2025

概括

一种新的猪生殖和呼吸系统综合征病毒 (PRRSV) 菌株HLJDZD55在中国出现. 这种血统1PRRSV是首个在中国发现的L1B菌株,这表明美国的引入和本地重组.

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
猪病研究研究猪病研究

背景情况:

猪生殖和呼吸系统综合征病毒 (PRRSV) 对中国的猪业构成重大威胁.
血统1PRRSV表现出广泛的遗传多样性,目前L1A和L1C菌株在中国占主导地位.
之前的报道表明,中国没有其他一线PRRSV分支机构.

研究的目的:

为了识别和描述在中国流传的新型PRRSV菌株.
研究新发现的PRRSV菌株的遗传起源和进化动态.
报告之前未被观察到的中国Lineage 1 PRRSV分支机构的出现.

主要方法:

流行病学调查和PRRSV菌株的隔离.
对ORF5和全基因组序列的遗传学分析.
Nsp2基因的氨基酸序列对齐以识别缺失.
全基因组测序和重组分析.

主要成果:

根据ORF5分析,确定了一种新型PRRSV菌株HLJDZD55,并根据遗传学定位在L1B分支中.
HLJDZD55在NSP2基因中表现出131个氨基酸的独特的不连续删除.
全基因组遗传学分析证实HLJDZD55属于L1C分支.
重组分析显示,HLJDZD55是中国L1C菌株 (TJZH-1607) 和美国L1B菌株 (明尼苏达州14) 的重组基因.

结论:

HLJDZD55代表了在中国新兴的Lineage 1 PRRSV,特别是L1B分支.
这些发现表明,美国L1B菌株被引入中国,然后与中国本地菌株重组.
这项研究标志着L1B PRRSV在中国首次有记录的出现,突显了正在进行的病毒演变和多样化.

更多相关视频

Use of Interferon-γ Enzyme-linked Immunospot Assay to Characterize Novel T-cell Epitopes of Human Papillomavirus

Use of Interferon-γ Enzyme-linked Immunospot Assay to Characterize Novel T-cell Epitopes of Human Papillomavirus

Published on: March 8, 2012

Identification of Functionally-Relevant Lentivirus Integration Sites in an Insertional Mutagenesis Cell Library

Identification of Functionally-Relevant Lentivirus Integration Sites in an Insertional Mutagenesis Cell Library

Published on: January 10, 2025

相关概念视频

Viral Recombination

Viral Recombination

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.

Viral Mutations

Viral Mutations

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...