Molecular Genetics And Evolution Of Antibiotic Resistant Staphylococci
Funder
National Health and Medical Research Council
Funding Amount
$437,545.00
Summary
Potentially life-threatening infections caused by Staphylococcus aureus bacteria, commonly known as Golden Staph, often arise as complications in patients within hospitals. These infections compromise the health of the patient and jeopardise their recovery from the condition for which they were initially admitted, which significantly increases healthcare costs. Hospital-acquired infections caused by Golden Staph are a major problem in Australia and globally. The problem is largely due to the pre ....Potentially life-threatening infections caused by Staphylococcus aureus bacteria, commonly known as Golden Staph, often arise as complications in patients within hospitals. These infections compromise the health of the patient and jeopardise their recovery from the condition for which they were initially admitted, which significantly increases healthcare costs. Hospital-acquired infections caused by Golden Staph are a major problem in Australia and globally. The problem is largely due to the presence in hospitals of strains that have become resistant to most clinically-useful antibiotics and are therefore very difficult to eradicate. This research project will reveal detailed information about strains of Golden Staph that are currently prevalent in hospitals in Australia, USA, Europe, and South East Asia. It will also provide important insights into the mechanisms that enable this organism to become resistant so readily, and identify factors that promote the development of resistant strains. The results of this research project will lead to improved methods for the characterisation of clinical strains and the monitoring of antibiotic resistance. The findings will also be of relevance to other types of antibiotic resistant bacteria. Most importantly, the application of knowledge arising from these studies has potential to minimise the emergence of strains that are even more resistant, thereby extending the effectiveness of existing and future antibiotics. The design and implementation of strategies to limit the proliferation of resistant bacteria are essential if we are to avoid a scenario similar to that prior to the introduction of antibiotics, when serious infectious diseases were often untreatable.Read moreRead less
Methylation-sensitive T Cell Genes And Childhood Food Allergy.
Funder
National Health and Medical Research Council
Funding Amount
$461,232.00
Summary
Australia has the highest reported prevalence food allergy in the world. Despite this, little is known about how allergy develops. Mounting evidence implicates environmentally induced disruption of the genetic blueprint via a process known as epigenetics. We are combining the strengths of food challenge proven food allergy with assessment of immune functioning & cutting edge genomics, to extensively characterise the pathways leading to food allergy in children.
Identification And Analysis Of Novel Replication Initiation Factors In Staphylococcus Aureus
Funder
National Health and Medical Research Council
Funding Amount
$311,789.00
Summary
Multi-drug resistant Golden staph is a serious medical problem around the world because strains are often resistant to commonly used treatments; new drugs are therefore urgently required. DNA replication is a fundamental process that is essential for the survival of all cellular organisms. This project aims to identify and characterise novel factors involved in DNA replication in Golden staph, which represent potential drug targets.
Plasmids are additional mini-chromosomes carried by many bacteria. They carry information that enables their hosts to prosper in otherwise hostile environments. Plasmids spread rapidly between bacteria, efficiently disseminating plasmid-borne information throughout bacterial populations. Many plasmids carry information that increases the virulence of their host. The emergence of multi-drug resistant bacteria and the rapid spread of the information enabling bacteria to withstand most antibiotics ....Plasmids are additional mini-chromosomes carried by many bacteria. They carry information that enables their hosts to prosper in otherwise hostile environments. Plasmids spread rapidly between bacteria, efficiently disseminating plasmid-borne information throughout bacterial populations. Many plasmids carry information that increases the virulence of their host. The emergence of multi-drug resistant bacteria and the rapid spread of the information enabling bacteria to withstand most antibiotics available today, were mediated by plasmids. Plasmids also carry information that ensures their own survival. Consequently, their hosts retain the plasmids even when it is no longer beneficial for them to do so. For example, plasmids mediating resistance to antibiotics are not lost when bacterial hosts are grown in the absence of those antibiotics. That is because plasmids have control systems, which ensure both that replication of the plasmid keeps pace with that of its host, and that the plasmid does not produce so many copies of itself that it overwhelms its host or places it at a competitive disadvantage amongst other bacteria. This project examines the intricate regulatory system that enables two groups of antibiotic-resistance plasmids to ensure that, on average, each plasmid molecule is replicated once per bacterial cell cycle. This system uses a tertiary RNA structure as a molecular switch, an antisense RNA as the regulator of this switch, and a protein that interacts with DNA sequences on the plasmid and with a bacterial protein, to initiate replication. Information gained from studies of plasmid systems is essential to the development of treatments for the elimination of antibiotic-resistance and virulence-contributing plasmids from populations of pathogenic bacteria. Antisense RNAs are not only a powerful research tool, but are also being developed for therapeutic use. Understanding how these RNAs interact with their targets will increase their effectiveness.Read moreRead less