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Improved biosecurity through the engineering of microbial ecosystems. This project aims to provide data and understanding that will help develop predictive models for changes in the distribution of drug-resistant bacteria, and surveillance and response programs for key biosecurity threats. Microorganisms, including commensals and pathogens, can live in complex communities in a range of environments including animal hosts. It is now known that these communities (known as microbiomes) can exert a ....Improved biosecurity through the engineering of microbial ecosystems. This project aims to provide data and understanding that will help develop predictive models for changes in the distribution of drug-resistant bacteria, and surveillance and response programs for key biosecurity threats. Microorganisms, including commensals and pathogens, can live in complex communities in a range of environments including animal hosts. It is now known that these communities (known as microbiomes) can exert a profound effect on animal health. This project seeks to understand where antimicrobial resistance genes reside in pig gut microbiotia and how they move between members of this complex microbial community, and to provide information on how probiotics may be used to reduce dependence on antibiotics.Read moreRead less
Unravelling small RNA regulatory networks to target and control bacteria. Small RNA (sRNA) molecules are critical regulators of bacterial gene expression. These molecules control important phenotypes in the Gram-negative veterinary pathogen Pasteurella multocida. This project aims to identify the range of P. multocida sRNAs and to show how expression of these molecules changes under various growth conditions. Specifically, this project endeavours: to identify the mRNA targets of the sRNAs; to id ....Unravelling small RNA regulatory networks to target and control bacteria. Small RNA (sRNA) molecules are critical regulators of bacterial gene expression. These molecules control important phenotypes in the Gram-negative veterinary pathogen Pasteurella multocida. This project aims to identify the range of P. multocida sRNAs and to show how expression of these molecules changes under various growth conditions. Specifically, this project endeavours: to identify the mRNA targets of the sRNAs; to identify the mechanisms of sRNA-mRNA interaction; to build systems-biology models that describe the sRNA regulatory circuits; to design inhibitors capable of disrupting critical sRNA-mRNA interactions; and to use the new inhibitors to modulate specific phenotypes. The ability to precisely manipulate sRNA regulatory circuits could allow fine control of bacterial phenotypes and could be widely applicable.Read moreRead less
Bacterial and host drivers of chlamydial blindness in koalas. Chlamydial infection of the eyes is a significant cause of disease and death in koalas, contributing to the ongoing decline of this native species. Little is known about what influences the outcome of these infections, challenging efforts to manage and control koala chlamydial blindness. This project aims to evaluate whether differences in the infecting Chlamydia pecorum strains or the koala immune response, are associated with the ou ....Bacterial and host drivers of chlamydial blindness in koalas. Chlamydial infection of the eyes is a significant cause of disease and death in koalas, contributing to the ongoing decline of this native species. Little is known about what influences the outcome of these infections, challenging efforts to manage and control koala chlamydial blindness. This project aims to evaluate whether differences in the infecting Chlamydia pecorum strains or the koala immune response, are associated with the outcome of chlamydial ocular infection. In addition to helping us to understand and prevent blindness in koalas, this project should significantly expand our knowledge of the koala immune system and generate an array of koala immunological assays, outcomes that may benefit all koala conservation efforts.Read moreRead less
Phase-variable epigenetic regulators in bacterial veterinary pathogens. This project aims to identify phasevarion regulated genes in the major bacterial swine pathogens Streptococcus suis and Actinobacillus pleuropneumoniae. Both species contain randomly switching epigenetic regulators that control expression of multiple genes by epigenetic mechanisms. Identifying phasevarion controlled genes will inform and direct future vaccine development for important livestock species.
Molecular characterisation of antibiotic resistance genes in Salmonella enterica and Escherichia coli recovered from food-producing animals and humans. Antibiotic resistance is an accelerating global problem. Antibiotic resistance genes are located on mobile genetic elements which can be horizontally transferred between distantly related bacteria. It is becoming increasingly apparent that healthy humans carry populations of resistant bacteria as part of the normal microbial flora. This project w ....Molecular characterisation of antibiotic resistance genes in Salmonella enterica and Escherichia coli recovered from food-producing animals and humans. Antibiotic resistance is an accelerating global problem. Antibiotic resistance genes are located on mobile genetic elements which can be horizontally transferred between distantly related bacteria. It is becoming increasingly apparent that healthy humans carry populations of resistant bacteria as part of the normal microbial flora. This project will characterise the antibiotic resistance gene arrangements among populations of bacteria which belong to the Enterobacteriaceae. These resistant bacteria represent a threat to human and veterinary health because they are readily ingested as part of the food chain and represent reservoirs for the spread of antibiotic resistance genes to pathogens.Read moreRead less
Defining domains within Mycoplasma hyopneumoniae surface proteins that interact with host extracellular matrix: efficacy testing of candidate vaccines in swine. Over 90% of Australian commercial pig production facilities are affected by Mycoplasma hyopneumoniae, the causative agent of swine enzootic pneumonia. This disease causes economic losses in Australia of over $20 million per annum and up to $1 billion per annum in major swine rearing countries worldwide. This project will determine the p ....Defining domains within Mycoplasma hyopneumoniae surface proteins that interact with host extracellular matrix: efficacy testing of candidate vaccines in swine. Over 90% of Australian commercial pig production facilities are affected by Mycoplasma hyopneumoniae, the causative agent of swine enzootic pneumonia. This disease causes economic losses in Australia of over $20 million per annum and up to $1 billion per annum in major swine rearing countries worldwide. This project will determine the protective efficacy of new generation vaccines against M. hyopneumoniae, which aim to block the colonisation process and prevent disease .Read moreRead less
Autotransporter proteins of enterohemorrhagic Escherichia coli O157:H7. Escherichi (E.) coli O157:H7 has caused hundreds of outbreaks in the United States and United Kingdom. Although not currently a major problem in Australia, the emergence of E. coli O157:H7 here would have serious implications for our meat and livestock industry. This study will provide important information for the selection of vaccine antigens used to prevent the colonisation of cattle with E. coli O157:H7 and other diarrho ....Autotransporter proteins of enterohemorrhagic Escherichia coli O157:H7. Escherichi (E.) coli O157:H7 has caused hundreds of outbreaks in the United States and United Kingdom. Although not currently a major problem in Australia, the emergence of E. coli O157:H7 here would have serious implications for our meat and livestock industry. This study will provide important information for the selection of vaccine antigens used to prevent the colonisation of cattle with E. coli O157:H7 and other diarrhoeagenic E. coli serotypes. A direct outcome of this will be improved human health, as E. coli O157:H7 can cause life threatening infections in humans. The study will also examine the contribution of specific adhesins to biofilm formation; measures to prevent biofilm formation may reduce the persistence and spread of E. coli O157:H7 in the environment.Read moreRead less
Identification and characterisation of Mycoplasma hyopneumoniae surface-molecules that interact with the host epithelium. Mycoplasma hyponeumoniae causes porcine enzootic pneumonia, a disease that significantly impacts swine production. Current vaccines are unable to prevent colonisation of the respiratory tract and are costly to produce and administer. The expression of microbial adhesins that mediate adherence to the extracellular matrix is considered the initial step in host colonisation for ....Identification and characterisation of Mycoplasma hyopneumoniae surface-molecules that interact with the host epithelium. Mycoplasma hyponeumoniae causes porcine enzootic pneumonia, a disease that significantly impacts swine production. Current vaccines are unable to prevent colonisation of the respiratory tract and are costly to produce and administer. The expression of microbial adhesins that mediate adherence to the extracellular matrix is considered the initial step in host colonisation for many bacterial pathogens. We propose to identify M. hyopneumoniae cell surface moleculaes that interact with components of the extracellular matrix. Targetting these cell surface molecules will lead to therapeutics that prevent disease and block colonisation, eventually eradicating the host pathogen from pig production facilities.Read moreRead less
A comprehensive analysis of the outer membrane, surface exposed and secreted proteome of Pasteurella multocida. Pasteurella multocida is the causative agent of a range of animal diseases. The molecular mechanisms of P. multocida pathogenesis are poorly understood and the current vaccines generally ineffective. We will identify all P. multocida outer membrane, surface exposed and secreted proteins expressed during natural infection, or under conditions which mimic natural infection, by a global p ....A comprehensive analysis of the outer membrane, surface exposed and secreted proteome of Pasteurella multocida. Pasteurella multocida is the causative agent of a range of animal diseases. The molecular mechanisms of P. multocida pathogenesis are poorly understood and the current vaccines generally ineffective. We will identify all P. multocida outer membrane, surface exposed and secreted proteins expressed during natural infection, or under conditions which mimic natural infection, by a global proteomics approach. We believe that secreted proteins and those found on the outer surface of the bacterial cell are likely to be crucial virulence determinants. The expected outcomes are the identification of a number of candidate vaccine antigens and an enhanced understanding of Pasteurella pathogenesis.Read moreRead less
The role of virulence factors of Clostridium difficile in food animals. Disease caused by the bacterium Clostridium difficile are a significant food production animal and public health problem in many countries. Specific animal and human public health resources have been allocated in many countries in efforts to mitigate the growing epidemics. The study proposed in this application presents a significant opportunity to learn about the virulence factors of animal strains of this bacterium about w ....The role of virulence factors of Clostridium difficile in food animals. Disease caused by the bacterium Clostridium difficile are a significant food production animal and public health problem in many countries. Specific animal and human public health resources have been allocated in many countries in efforts to mitigate the growing epidemics. The study proposed in this application presents a significant opportunity to learn about the virulence factors of animal strains of this bacterium about which very little is known. This project will lead to rationally designed preventative and treatment strategies that apply to both animals and humans, thereby impeding epidemics caused by C. difficile in Australia.Read moreRead less