Genetically modified ruminal bacteria protect sheep from fluoroacetate poisoning

Area of Science:

• Microbiology
• Toxicology
• Ruminant Science

Background:

• Fluoroacetate is a highly toxic compound found in certain plants.
• Ruminants are susceptible to fluoroacetate poisoning, leading to severe health issues.
• Developing effective countermeasures against fluoroacetate toxicity is crucial for animal health.

Purpose of the Study:

• To assess the efficacy of genetically modified Butyrivibrio fibrisolvens in mitigating fluoroacetate poisoning in sheep.
• To evaluate the survival and population dynamics of the engineered bacteria in the rumen environment.
• To compare the toxicological outcomes between inoculated and control sheep.

Main Methods:

• Four Butyrivibrio fibrisolvens strains were engineered to express fluoroacetate dehalogenase.
• The engineered bacteria were administered to test sheep, maintaining populations of 10^6-10^7 cells/mL in the rumen.
• Toxicological symptoms (behavioral, physiological, histological) were monitored and compared between inoculated sheep and uninoculated controls.

Main Results:

• The engineered Butyrivibrio fibrisolvens strains successfully colonized the sheep rumen.
• Inoculated sheep exhibited significantly reduced toxicological symptoms compared to control sheep after fluoroacetate exposure.
• The study demonstrated a protective effect of the engineered bacteria against fluoroacetate poisoning.

Conclusions:

• Genetically modified Butyrivibrio fibrisolvens expressing fluoroacetate dehalogenase can effectively reduce fluoroacetate toxicity in sheep.
• This microbial strategy offers a potential novel approach for managing fluoroacetate poisoning in ruminant livestock.
• Further research may explore optimizing bacterial delivery and efficacy in diverse animal models and poisoning scenarios.