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Heat regulation by the fibre types in muscle. Mammals maintain a constant core body temperature by generating heat in resting muscles in response to changes in the environmental temperatures. This project aims to show how the fibre types that make up skeletal muscles regulate heat generation against other muscle function, to maintain core body temperature and the normal movement and posture of the mammal. Project outcomes include defining, for the first time, how heat generation in the muscles o ....Heat regulation by the fibre types in muscle. Mammals maintain a constant core body temperature by generating heat in resting muscles in response to changes in the environmental temperatures. This project aims to show how the fibre types that make up skeletal muscles regulate heat generation against other muscle function, to maintain core body temperature and the normal movement and posture of the mammal. Project outcomes include defining, for the first time, how heat generation in the muscles of the body is regulated. This should provide critical knowledge of mammalian evolution and ways to manipulate metabolism, which may provide ways to assist with achieving a desired meat quality and yield in beef and other commercially important animals.Read moreRead less
Interrogating the extremes of skeletal muscle plasticity in vertebrates. This project aims to interrogate how muscles adapt to growth and endurance stimuli at different stages of life, relevant to addressing challenges facing the world’s ageing population. Using innovative gene technologies and molecular physiology in zebrafish and mice, this project will answer important, unresolved questions in muscle biology. The project will generate knowledge needed to develop interventions to improve quali ....Interrogating the extremes of skeletal muscle plasticity in vertebrates. This project aims to interrogate how muscles adapt to growth and endurance stimuli at different stages of life, relevant to addressing challenges facing the world’s ageing population. Using innovative gene technologies and molecular physiology in zebrafish and mice, this project will answer important, unresolved questions in muscle biology. The project will generate knowledge needed to develop interventions to improve quality of life for older Australians and address the physical realities of an ageing workforce. Benefits extend to enhancing workplace safety and productivity, improving farming efficiencies for livestock and aquaculture industries, and training emerging leaders in the biological sciences.Read moreRead less
How are sperm mitochondria eliminated after fertilisation . The fact that mitochondria are inherited exclusively through the maternal germ-line is fundamental feature of sexual reproduction in all but a few organisms. This uni-parental inheritance is thought to prevent genetic conflict between different mitochondrial genomes. The mechanisms controlling uniparental inheritance involve eliminating the sperm mitochondria soon after fertilisation. We will investigate 2 possible mechanisms, (1) acti .... How are sperm mitochondria eliminated after fertilisation . The fact that mitochondria are inherited exclusively through the maternal germ-line is fundamental feature of sexual reproduction in all but a few organisms. This uni-parental inheritance is thought to prevent genetic conflict between different mitochondrial genomes. The mechanisms controlling uniparental inheritance involve eliminating the sperm mitochondria soon after fertilisation. We will investigate 2 possible mechanisms, (1) active destruction and (2) passive dilution. The results will help explain how heteroplasmy is avoided in order to maintain the fitness of organisms including animals and humans. The results will have long term insights into improving breeding in agriculture and in the prevention of mitochondrial genetic disease.Read moreRead less
Understanding why mammalian eggs have so much mitochondrial DNA . During oocyte growth there is massive increase in the replication of mitochondrial DNA so that each ovulated egg has 200,000-400,000 copies of the mitochondrial genome. This mitochondrial compliment will provide the template for all mitochondrial DNA in the subsequent organism. The established role of mitochondria is to provide energy in the form of ATP, but they are also known to be highly adaptive to the metabolic and energetic ....Understanding why mammalian eggs have so much mitochondrial DNA . During oocyte growth there is massive increase in the replication of mitochondrial DNA so that each ovulated egg has 200,000-400,000 copies of the mitochondrial genome. This mitochondrial compliment will provide the template for all mitochondrial DNA in the subsequent organism. The established role of mitochondria is to provide energy in the form of ATP, but they are also known to be highly adaptive to the metabolic and energetic state of the cell. In this project, we will use genetic approaches to decrease the amount of oocyte mitochondrial DNA by 90%. We will examine how this influences mitochondrial organisation, oocyte metabolism and embryo development. This new knowledge will provide insights into animal breeding and human health.Read moreRead less