Marsupial germ cells and genes. Germ cells are the most fascinating cells in the body, since theirs is the unique responsibility for transmitting life from generation to generation. Studies in mice have suggested that position in the embryo determines their origin, but the early embryology of the mouse is so different from that of other mammals that the events need confirming and extending in another species. The simplified embryology of the tammar wallaby makes it ideal for studying one of the ....Marsupial germ cells and genes. Germ cells are the most fascinating cells in the body, since theirs is the unique responsibility for transmitting life from generation to generation. Studies in mice have suggested that position in the embryo determines their origin, but the early embryology of the mouse is so different from that of other mammals that the events need confirming and extending in another species. The simplified embryology of the tammar wallaby makes it ideal for studying one of the most fundamental questions in the whole of biology: what is the basis for the primal distinction between sex and soma?Read moreRead less
How does the unilaminar blastocyst form an embryo? Marsupials are synonymous with Australia and they are scientifically amazing. An understanding how the single-layered marsupial blastocyst cells are directed to form the complex organisation of an embryo would help us understand the biology underlying the developmental potential of all cells. Understanding these processes is not only of great fundamental interest to developmental biology but also for the development of embryonic stem cell lines. ....How does the unilaminar blastocyst form an embryo? Marsupials are synonymous with Australia and they are scientifically amazing. An understanding how the single-layered marsupial blastocyst cells are directed to form the complex organisation of an embryo would help us understand the biology underlying the developmental potential of all cells. Understanding these processes is not only of great fundamental interest to developmental biology but also for the development of embryonic stem cell lines. This research will continue Australia's high profile in reproductive biology using one of our iconic native mammals. A greater understanding of marsupial reproduction will also contribute to management of our threatened marsupial populations.Read moreRead less
Taming the intruders: the domestication of Tigger transposable elements in mammals. It has become apparent that most of the DNA that makes us what we are is actually comprised of the remnants of invading parasitic DNA acquired over time. A continual battle exists between host which tries to silence or remove this DNA, and the parasite that tries to multiply and spread. We are currently investigating an intriguing aspect of this process that involves host genomes 'domesticating' parasitic DNA to ....Taming the intruders: the domestication of Tigger transposable elements in mammals. It has become apparent that most of the DNA that makes us what we are is actually comprised of the remnants of invading parasitic DNA acquired over time. A continual battle exists between host which tries to silence or remove this DNA, and the parasite that tries to multiply and spread. We are currently investigating an intriguing aspect of this process that involves host genomes 'domesticating' parasitic DNA to provide novel functions, thereby facilitating the evolution of specific characteristics within species.Read moreRead less
Identification of nuclear reprogramming factors in oocyte cytoplasm. The mature oocyte contains dominant factors that are capable of erasing tissue specific gene expression profiles of somatic cells. These reprogramming factors would be valuable for dedifferentiation of cells and for nuclear transfer in animal cloning. The research involves determination of reprogramming factors present in active cytoplasm following enucleation of the germinal vesicle, blockage of transcription and translation, ....Identification of nuclear reprogramming factors in oocyte cytoplasm. The mature oocyte contains dominant factors that are capable of erasing tissue specific gene expression profiles of somatic cells. These reprogramming factors would be valuable for dedifferentiation of cells and for nuclear transfer in animal cloning. The research involves determination of reprogramming factors present in active cytoplasm following enucleation of the germinal vesicle, blockage of transcription and translation, and timed cultures. The assays will involve maintenance of reprogramming ability and erasure of somatic gene transcription. By subtractive elimination the function of isolated proteins which are involved in reprogramming will be identified for potential recombinant production.Read moreRead less
Controlling cell polarity and asymmetric cell division in space and time. This project seeks to increase our understanding of how cells divide. Asymmetric cell division is a specialised form of cell division essential for the development of all organisms. The two meiotic divisions of the oocyte are extreme examples of asymmetric cell division that allow a reduction in chromosome content while retaining cytoplasmic vestments necessary for development. Successful asymmetric cell division requires ....Controlling cell polarity and asymmetric cell division in space and time. This project seeks to increase our understanding of how cells divide. Asymmetric cell division is a specialised form of cell division essential for the development of all organisms. The two meiotic divisions of the oocyte are extreme examples of asymmetric cell division that allow a reduction in chromosome content while retaining cytoplasmic vestments necessary for development. Successful asymmetric cell division requires the integration of cell cycle events with cell polarity. Understanding how this is achieved would improve our understanding of how to generate a healthy embryo in women, endangered species and in animals of commercial importance.Read moreRead less
Discovering mechanisms of primary embryonic tissue migration through live cell imaging and novel genetic approaches. The studies proposed here will provide concepts and knowledge about the molecular basis of cell migration that will impact on diverse aspects of human health, such as the causes and nature of tumour metastasis and our understanding of the developmental basis of birth defects. In addition, understanding cell migration mechanisms will allow us to better predict or control the behav ....Discovering mechanisms of primary embryonic tissue migration through live cell imaging and novel genetic approaches. The studies proposed here will provide concepts and knowledge about the molecular basis of cell migration that will impact on diverse aspects of human health, such as the causes and nature of tumour metastasis and our understanding of the developmental basis of birth defects. In addition, understanding cell migration mechanisms will allow us to better predict or control the behaviour of therapeutic stem cells introduced into the body.Read moreRead less
Understanding how cells compact and segregate DNA in vertebrates. How a cell compacts and divides its DNA is still a major unanswered question in biology. This project will determine the way in which a cell compacts its DNA nearly ten thousand fold to allow the faithful and accurate segregation to daughter nuclei.
How does Fat cadherin control organ size in Drosophila, and cancer in humans? The primary function of Fat cadherin is to dictate the appropriate size of organs in developing animals. Deficiency in the fat gene results in vastly overgrown organs and can lead to the formation of cancer in humans. Our study will provide important insights into how the size of organs are controlled during development. Our research findings will have important implications for several aspects of human health and biol ....How does Fat cadherin control organ size in Drosophila, and cancer in humans? The primary function of Fat cadherin is to dictate the appropriate size of organs in developing animals. Deficiency in the fat gene results in vastly overgrown organs and can lead to the formation of cancer in humans. Our study will provide important insights into how the size of organs are controlled during development. Our research findings will have important implications for several aspects of human health and biology, and will increase our understanding of diseases that arise due to aberrant tissue growth, such as cancer. Our research findings will thus be of substantial national benefit, given that cancer is now the biggest cause of death in Australia, and that more than 88,000 Australians are diagnosed with cancer each year. Read moreRead less
The effect of mitochondrial and nuclear-cytoplasmic variation on longevity, metabolism and stress resistance in Drosophila. Much research points to a major role of free radical damage in aging, thus the belief that antioxidants might be beneficial in delaying aging. Free radicals are mostly formed in the subcellular organelles which consume oxygen and produce energy, and this may be the major site of age-related damage. This project seeks to understand the degree to which variation among these ....The effect of mitochondrial and nuclear-cytoplasmic variation on longevity, metabolism and stress resistance in Drosophila. Much research points to a major role of free radical damage in aging, thus the belief that antioxidants might be beneficial in delaying aging. Free radicals are mostly formed in the subcellular organelles which consume oxygen and produce energy, and this may be the major site of age-related damage. This project seeks to understand the degree to which variation among these subcellular organelles affect free radical damage and aging, using the fruitfly Drosophila melanogaster as a model organism.Read moreRead less
Modern reptiles with ancient toxins: the molecular origin and evolution of novel bioactive proteins from squamate dental glands. Animal venoms provide a rich source of novel bioactive proteins, some of which have demonstrated therapeutically useful activities. Through this researcher's unique approach of investigating previously unmapped squamate venom systems, there is potential for the identification of divergent, bioactive proteins. Those already identified by the applicant in the dental gl ....Modern reptiles with ancient toxins: the molecular origin and evolution of novel bioactive proteins from squamate dental glands. Animal venoms provide a rich source of novel bioactive proteins, some of which have demonstrated therapeutically useful activities. Through this researcher's unique approach of investigating previously unmapped squamate venom systems, there is potential for the identification of divergent, bioactive proteins. Those already identified by the applicant in the dental glands of Australian monitor lizard species represent a tremendous opportunity for biodiscovery. Further knowledge in this area will increase medical understandings of bites and aid conservation measures informed by the natural history of these animals.Read moreRead less