Toxoplasma sporozoite genes that determine environmental resistance and invasion of host cells.

弓形虫子孢子基因决定宿主细胞的环境抵抗力和入侵。

基本信息

  • 批准号:
    10507659
  • 负责人:
  • 金额:
    $ 22.95万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
  • 财政年份:
    2022
  • 资助国家:
    美国
  • 起止时间:
    2022-05-24 至 2024-04-30
  • 项目状态:
    已结题

项目摘要

Project Summary The parasite Toxoplasma gondii can cause severe disease in immunocompromised patients and fetuses and is the second leading cause of foodborne deaths in the USA. Infection starts after ingestion of oocysts shed in cat feces or after ingestion of meat contaminated with tissue cysts. Oocysts are extremely stable in the environment, resistant to the most inactivation procedures, and highly infectious. Because livestock get infected by sporozoites derived from oocysts, a vaccine based on sporozoites or sporozoite proteins could be effective in protecting livestock and humans. Currently, the only vaccine available is a live attenuated vaccine only approved for use in sheep. However, this vaccine has serious shortcomings as the genetic basis for the attenuation is not known, which poses reversion risks, and it needs to be used immediately once produced because it is based on live tachyzoites, which are not viable for long outside host cells. Despite being a critical step for Toxoplasma transmission, sporozoites inside oocysts are under-studied, largely because they are not cultivatable in vitro and difficult to access in vivo. There is, therefore, a critical need to identify sporozoite gene products that are critical for its invasion of host cells, which could lead to the discovery of vaccine targets. Furthermore, if the genetic basis for the extreme environmental resistance of sporozoites was known it might be possible to exploit this to make other Toxoplasma life stages, such as tachyzoites, or other pathogens more viable extracellularly, which could enhance the shelf-life of vaccines based on live parasites. Our overall objectives are to identify Toxoplasma genes that are specifically involved in the environmental resistance and infectivity of sporozoites. Our central hypotheses are that 1) sporozoite-specific micronemal proteins (MICs) are critical for their invasion into host cells; 2) late embryogenesis abundant proteins (LEAs), which are known to provide resistance to environmental stresses such as drought, high salinity, and freezing in a variety of organisms, determine sporozoite resistance to environmental stressors. In our first aim we will determine the role of LEAs in the protection of sporozoites against environmental stressors. In our second aim we will test the hypothesis that MICs that are specifically expressed in sporozoites are involved in the invasion of host cells. The identification of sporozoite genes that play a role in extracellular survival and attachment/invasion of host cells, will pave the way for designing vaccines that can prevent Toxoplasma infection of humans and animals.
项目总结

项目成果

期刊论文数量(0)
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科研奖励数量(0)
会议论文数量(0)
专利数量(0)

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JEROEN SAEIJ其他文献

JEROEN SAEIJ的其他文献

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{{ truncateString('JEROEN SAEIJ', 18)}}的其他基金

Genetic barcoding to track Toxoplasma cyst heterogeneity during brain colonization, reactivation, and drug treatment.
基因条形码可追踪脑部定植、重新激活和药物治疗过程中弓形虫囊肿的异质性。
  • 批准号:
    10545368
  • 财政年份:
    2022
  • 资助金额:
    $ 22.95万
  • 项目类别:
Genetic barcoding to track Toxoplasma cyst heterogeneity during brain colonization, reactivation, and drug treatment.
基因条形码可追踪弓形虫包囊在脑定植、重新激活和药物治疗过程中的异质性。
  • 批准号:
    10664008
  • 财政年份:
    2022
  • 资助金额:
    $ 22.95万
  • 项目类别:
Toxoplasma sporozoite genes that determine environmental resistance and invasion of host cells.
弓形虫子孢子基因决定宿主细胞的环境抵抗力和入侵。
  • 批准号:
    10628015
  • 财政年份:
    2022
  • 资助金额:
    $ 22.95万
  • 项目类别:
Synthetic lethality screens in a nutrient sensitized Toxoplasma strain to identify novel proteins that mediate nutrient acquisition in chronic Toxoplasma infection.
对营养敏感的弓形虫菌株进行合成致死性筛选,以鉴定介导慢性弓形虫感染中营养获取的新蛋白质。
  • 批准号:
    10010286
  • 财政年份:
    2020
  • 资助金额:
    $ 22.95万
  • 项目类别:
Synthetic lethality screens in a nutrient sensitized Toxoplasma strain to identify novel proteins that mediate nutrient acquisition in chronic Toxoplasma infection.
对营养敏感的弓形虫菌株进行合成致死性筛选,以鉴定介导慢性弓形虫感染中营养获取的新蛋白质。
  • 批准号:
    10097993
  • 财政年份:
    2020
  • 资助金额:
    $ 22.95万
  • 项目类别:
Identification of Toxoplasma genes that mediate its colonization of the eye
鉴定介导其在眼睛定植的弓形虫基因
  • 批准号:
    10242167
  • 财政年份:
    2020
  • 资助金额:
    $ 22.95万
  • 项目类别:
Identification of Toxoplasma genes that mediate its colonization of the eye
鉴定介导其在眼睛定植的弓形虫基因
  • 批准号:
    10040382
  • 财政年份:
    2020
  • 资助金额:
    $ 22.95万
  • 项目类别:
A serological test to determine strains associated with ocular toxoplasmosis
确定与眼弓形体病相关菌株的血清学测试
  • 批准号:
    8891026
  • 财政年份:
    2015
  • 资助金额:
    $ 22.95万
  • 项目类别:
A serological test to determine strains associated with occular toxoplasmosis
确定与眼弓形体病相关菌株的血清学测试
  • 批准号:
    9070589
  • 财政年份:
    2015
  • 资助金额:
    $ 22.95万
  • 项目类别:
Toxoplasma proteins that modulate the host cell
调节宿主细胞的弓形虫蛋白
  • 批准号:
    8880721
  • 财政年份:
    2009
  • 资助金额:
    $ 22.95万
  • 项目类别:

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保护猪免受地方性肺炎:安全减毒疫苗的合理设计。
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针对脑炎甲病毒的减毒活疫苗的知情方法
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快速生成和测试 SARS-CoV-2 减毒活疫苗
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针对脑炎甲病毒的减毒活疫苗的知情方法
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用于预防胸膜肺炎放线杆菌引起的疾病的减毒活疫苗
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