Dissecting The Role Of Hedgehog Signalling In Chondrogenesis And Skeletal Disease
Funder
National Health and Medical Research Council
Funding Amount
$408,739.00
Summary
There are close to 400 inherited disorders that affect how the skeleton develops, as well as a range of injury and age-related skeletal defects. There is much interest in treating such abnormalities with artificial bone grown outside the body. In order to achieve this aim we must understand all of the processes involved in producing and maintaining bone within the body. We are using both mouse and cell culture models of skeletal development to increase our understanding of these processes.
Disorders of sexual development (DSDs) are surprisingly common, and often result in infertility, genital abnormalities, gender mis-assignment and long-term psychological trauma. In this Program we will pool our expertise in human molecular genetics, mouse developmental biology and protein chemistry to identify genes important for sex determination and development of the gonads, and discover how they contribute to DSD, in order to improve clinical care to patients with DSD.
Body Segment Identity Specification By The Transcription Regulator, Moz
Funder
National Health and Medical Research Council
Funding Amount
$366,301.00
Summary
One in 28 newborns have birth defects. Cleft palate and aortic arch defects are among the most common, always requiring surgery and often causing lethality. We propose to study a protein, Moz, which is essential for palate and aortic arch development. Moz (Monocytic leukaemia zinc finger protein) was first identified in human chromosomal abnormalities causing particularly aggressive forms of childhood and adult leukaemia. We have shown previously that Moz is essential for the formation of blood ....One in 28 newborns have birth defects. Cleft palate and aortic arch defects are among the most common, always requiring surgery and often causing lethality. We propose to study a protein, Moz, which is essential for palate and aortic arch development. Moz (Monocytic leukaemia zinc finger protein) was first identified in human chromosomal abnormalities causing particularly aggressive forms of childhood and adult leukaemia. We have shown previously that Moz is essential for the formation of blood stem cells. Moz can regulate the activity of genes, but which genes it regulates in vivo is unknown. In the absence of Moz, mice are born with a cleft palate, lack the thymus, where immune cells are instructed, and fail to form the lung blood circulation, so that they are unable to supply their blood with oxygen after birth. Moz deficiency also causes defects of the vertebrate column, such that individual vertebrae acquire the appearance of their neighbours. These symptoms are typical for a general defect in positional information of individual body segments with respect to their location along the body axis. We will investigate the molecular mechanisms that require Moz in patterning of the body axis. This project will characterize a genetic mechanism that is crucial for normal development of the palate, the aorta and the vertebrate column.Read moreRead less
Molecular Genetics Of Sex Determination And Gonad Development
Funder
National Health and Medical Research Council
Funding Amount
$539,000.00
Summary
Disorders of sexual development are among the most common forms of birth defects in humans (1 in 4,000 births). Many other childhood conditions with this incidence warrant prenatal diagnosis or neonatal screening. These disorders often result in infertility, genital abnormalities and gender mis-assignment. Uncertainty about a child s gender at birth can be very traumatic physically and psychologically for the individual and family concerned. There are profound consequences in later life for the ....Disorders of sexual development are among the most common forms of birth defects in humans (1 in 4,000 births). Many other childhood conditions with this incidence warrant prenatal diagnosis or neonatal screening. These disorders often result in infertility, genital abnormalities and gender mis-assignment. Uncertainty about a child s gender at birth can be very traumatic physically and psychologically for the individual and family concerned. There are profound consequences in later life for the affected individual. The cause of these problems is most often the failure of the delicate network of gene regulation that is responsible for proper development of testes or ovaries in the embryo. This research project will identify genes important for sex determination and development of the gonads, find out how these genes function and interact, and discover how they contribute to cases of aberrant sexual development in humans.Read moreRead less
I am a geneticist determining the molecular mechanisms that underlie gonad (testis and ovary) development and dysgenesis in patients with disorders of sexual development.
The Identification Of Genes Involved In Mammalian Craniofacial Development And Disease
Funder
National Health and Medical Research Council
Funding Amount
$408,055.00
Summary
Birth defects arising from abnormal development of the embryo are a major cause of infant mortality and childhood disabilities. On average 3-4% of liveborn babies have a major congenital abnormality, and of the 15-20% of pregnancies which spontaneously abort, many are due to chromosomal or other developmental anomalies. A common feature of many developmental disorders is dysmorphology of the face, suggesting that genes important in patterning the face are also important in the development of oth ....Birth defects arising from abnormal development of the embryo are a major cause of infant mortality and childhood disabilities. On average 3-4% of liveborn babies have a major congenital abnormality, and of the 15-20% of pregnancies which spontaneously abort, many are due to chromosomal or other developmental anomalies. A common feature of many developmental disorders is dysmorphology of the face, suggesting that genes important in patterning the face are also important in the development of other organ systems. During development of the embryo many of the features of the face derive from a series of swellings termed the pharyngeal arches. The complex processes which determine how the face develops are in a large part controlled by the co-ordinated expression of a large number of genes in the first two of the five pharyngeal arch pairs. While we know some of the genes involved in these processes, the precise mechanisms of craniofacial development are relatively poorly understood. In this project we propose a large scale approach to identifying genes involved in development of the mammalian face and to further delineating their role in development and human disease. This approach takes advantage of state of the art genomic technologies available at the IMB and through existing collaborations overseas. In collaboration with Dr Bento Soares (University of Iowa) we have constructed a library containing all of the genes which are expressed in the first two pairs of pharyngeal arches in the developing mouse embryo. Using an approach designed to eliminate all those genes which are expressed in all or most tissues of the body and play a general role in the body's metabolism, we will select for those genes which play a specific and important role in embryonic development. We will then isolate the human counterparts of these genes and more thoroughly investigate their role in embryonic development and disease.Read moreRead less
Identification Of Genes Responsible For Disorders Of Sexual Development Using Genome-wide Copy Number Analysis
Funder
National Health and Medical Research Council
Funding Amount
$305,774.00
Summary
Congenital conditions in which development of the gonads or anatomical sex is abnormal are surprisingly common. The underlying cause of these problems is most often the failure of genes responsible for the proper development of testes or ovaries. Only a small proportion of patients can be explained by mutations in known gonad determining genes. We will analyse DNA from these patients on very high density microarrays to identify new genes that cause abnormalities in testis or ovary development.
The Role Of Crim1, A Novel TGFb Superfamily Modulator, In Early Vertebrate Patterning, Vascular And Renal Development.
Funder
National Health and Medical Research Council
Funding Amount
$501,300.00
Summary
The transforming growth factor (TGF) beta superfamily is a large group of secreted growth factors who play many different roles in normal development of tissues such as the brain, skeleton, heart, kidney, eyes, teeth and limbs. One of the groups within the superfamily, the bone morphogenetic proteins (BMPs), are being used in clinical trials to assist in regrowing bones after fracture. These molecules are also of interest for clinical reasons as growth factors within this family can also be dele ....The transforming growth factor (TGF) beta superfamily is a large group of secreted growth factors who play many different roles in normal development of tissues such as the brain, skeleton, heart, kidney, eyes, teeth and limbs. One of the groups within the superfamily, the bone morphogenetic proteins (BMPs), are being used in clinical trials to assist in regrowing bones after fracture. These molecules are also of interest for clinical reasons as growth factors within this family can also be deleterious, with their overexpression leading to conditions such as renal fibrosis and cataract. The activity of these growth factors is regulated by many other proteins, including protein antagonists which bind and inactivate them. It is therefore possible that by understanding these antagonists, we can find new ways of altering TGF beta superfamily activity. We have previously identified a novel protein, Crim1, which we have now shown can bind to TGF superfamily members and can reduce their secretion. We believe that Crim1 plays a role in the patterning of the central nervous system, the development of the blood vessels and the kidneys by regulating the TGFbeta superfamily. In this grant we will be investigating what the effect of disruption to Crim1 is on these organ systems and working out which members of the TGFbeta superfamily it is affecting to cause these effects. To do this, we will knock out the gene in zebrafish and characterise the defects found in a mouse line in which the gene has been disrupted. This may be important in developing new ways of activating or inactiviating these growth factors in a number of clinical conditions.Read moreRead less
The Role Of The Transcriptional Co-activator, Qkf, In Adult Neural Stem Cell Self-renewal And Multi-potency.
Funder
National Health and Medical Research Council
Funding Amount
$403,709.00
Summary
In recent years there has been considerable interest in stem cells because they have the potential to provide new therapeutic approaches to disease. Indeed, haematopoietic stem cells are already used in treatments for leukaemia. Many organs in adult humans contain stem cells, including the brain. In order to develop safe, and effective, stem cell-based treatments for human diseases it is necessary to determine how proliferation and differentiation are regulated in adult stem cells.