来自地理上多样化的低收入和中等收入国家的Shigella flexneri血清型6菌株的表征
Caitlin E Gabor1,2,3, Charlotte E Chong4, Jose M Lemme-Dumit3,5
1Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, USA.
mBio
|December 10, 2024
概括
石格拉柔性菌血清型6 (Sf6) 显示保存的基因组特征和独特的表型特征,使其与其他血清型区别开来. 这一发现对于开发针对性疫苗和针对石病的诊断非常重要.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 免疫学 免疫学 免疫学
背景情况:
- 由西格拉菌种引起的石病是全球主要的健康问题,特别是在低收入和中等收入国家.
- 希格拉菌中的抗菌素耐药性需要新的预防策略,包括疫苗.
- 石格拉柔性菌6型血清型 (Sf6) 在流行病学上具有重要意义,但仍未得到充分研究.
研究的目的:
- 进行Sf6分离物的比较基因组和表型分析.
- 为了确定Sf6特定的遗传因素和毒性特征.
- 为了帮助开发针对Sf6的疫苗和诊断.
主要方法:
- 对325个Sf6菌株和728个非Sf6菌株进行比较基因组分析.
- 11个临床Sf6菌株的全基因组测序.
- 表型分析包括细胞入侵,细胞因子诱导和蛋白质分泌.
主要成果:
- Sf6菌株表现出显著的基因组同质性,并具有独特的毒性因子,包括一种新的II型分泌系统.
- 确定的毒性基因 (ospG) 和代谢基因 (rutABCDEFGR) 在Sf6.6中明显缺席.
- Sf6病毒性等离子体 (pINV) 比其他S. flexneri血清型小,Sf6显示细胞内入侵和细胞因子诱导减少.
- 在非洲Sf6分离物中观察到特定于地理位置的抗生素敏感性模式.
结论:
- Sf6具有保存和独特的基因型和表型特征,使其与其他S. flexneri血清型区别开来.
- 鉴定出Sf6的保存特征对开发全球性,血清型特异性疫苗和诊断工具充满希望.
- 对Sf6独特的生物学进行进一步的研究对于有效的护病控制策略至关重要.
相关概念视频
Bacterial Gastroenteritis
Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...
Cholera
Cholera is an acute gastrointestinal disease caused by the Gram-negative bacterium Vibrio cholerae. It is transmitted primarily via the fecal-oral route through the ingestion of contaminated water or food.Vibrio cholerae is a motile, Gram-negative bacterium of the family Vibrionaceae, primarily associated with waterborne outbreaks in areas with inadequate sanitation. Although over 200 serogroups of V. cholerae exist, only O1 and O139 are responsible for epidemic cholera. The O1 serogroup,...
Giardiasis
Giardiasis is a globally prevalent intestinal infection caused by the protozoan parasite Giardia duodenalis (also known as G. lamblia or G. intestinalis). This flagellated protozoan is the most frequently identified intestinal parasite in the United States and worldwide. Transmission primarily occurs via the fecal-oral route, with infection arising from ingestion of water or food contaminated with cysts. Individuals in low-resource settings, international travelers, outdoor enthusiasts, daycare...
Amebiasis
Entamoeba histolytica, a protozoan parasite, is responsible for intestinal and extraintestinal amebiasis. Though a significant proportion of infections remain asymptomatic, approximately 50 million individuals annually are estimated to present with clinical disease, resulting in up to 100,000 deaths globally. The disease burden is disproportionately high in regions with lower socioeconomic status, such as parts of India, Africa, Mexico, and Latin America.Etiology and TransmissionThe infective...


