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Cis Regulatory And Functional Analysis Of Genomic Loci With Implication In Hypothalamic Obesity Using The Zebrafish As A Model System
Funder
National Health and Medical Research Council
Funding Amount
$480,936.00
Summary
Gene regulatory mutations cause changes in gene activity (expression -level, -time, -site) and therefore decide about the availability of proteins. Regulatory mutations in uncharacterized genomic loci that are related to obesity and further their effects shall be identified, with emphasis on those affecting the hypothalamic food intake control circuits. Since the energy metabolism system and the obesity candidate genes are conserved, the model system zebrafish will be used for these analyses.
Nigel G Laing, NH&MRC Principal Research Fellowship: Neurogenetics – Gene Discovery, Pathobiology, Novel Therapeutics, Novel Diagnostics And Translation.
Funder
National Health and Medical Research Council
Funding Amount
$880,454.00
Summary
My Fellowship will expand my work identifying diseases genes for genetic muscle and nerve diseases by using new technologies that allow discovery of human disease genes which could not be found before. In addition, since we now have proof from mouse studies that heart actin is a target for therapy for the group of diseases that we discovered caused by mutations in the muscle actin protein, we shall take further steps towards making this therapy a reality for patients.
Investigation Into The Roles Of A Novel Vertebrate Gene, S52, In CNS Development And Pathogenesis
Funder
National Health and Medical Research Council
Funding Amount
$272,389.00
Summary
Developmentally regulated genes when mutated or deleted can cause a variety of diseases including neurological diseases in humans. It is therefore important to understand the fundamental molecular genetics of development. We have discovered a novel human gene, termed S52, and its equivalent gene in the mouse. The predicted protein derived from these genes would indicate that S52 protein may interact with other proteins, possibly nerve growth factors, in the body to regulate normal development an ....Developmentally regulated genes when mutated or deleted can cause a variety of diseases including neurological diseases in humans. It is therefore important to understand the fundamental molecular genetics of development. We have discovered a novel human gene, termed S52, and its equivalent gene in the mouse. The predicted protein derived from these genes would indicate that S52 protein may interact with other proteins, possibly nerve growth factors, in the body to regulate normal development and possibly facilitate the survival of nerve cells in embryos. Strikingly, the worm C. elegans, an evoluationary very distant animal, also has a very similar gene to human. The fact that the protein has been so conserved throughout evolution supports the idea that S52 function is important in development. S52 mRNA is expressed in the developing brain, particularly in a special group of cells called the floor plate. Floor plate is a tissue that has ability to organize the patterning and differentiation of cells within the developing brain. S52 is also expressed in motor neurons in early stages of development and later in a subset of dorsal spinal cord neurons. We have mapped S52 to the short arm of human chromosome 2 (2p15-22). This region of chromosome 2 is linked to several human genetic diseases with neurological defects. Based on our preliminary data, we think S52 is not only important for normal brain development but may be mutated in a human neurological disease called Spastic Paraplegia Type 4 (SPG4) which is characterized by a degeneration of nerve cells in the spinal cord. The aim of this project is to further our understanding of the function of this gene and investigate its role in disease. This knowledge will contribute to an overall increase in our understanding of the molecular basis of brain development and neurological disease in humans.Read moreRead less
Cell Type Specification In Developing CNS: Functional Analysis Of Sox14
Funder
National Health and Medical Research Council
Funding Amount
$468,055.00
Summary
The central nervous system (CNS) is the most complex organ in the body. The vast majority of nerve cells in the CNS are classified as 'interneurons'. These cells relay sensory information and motor commands within the CNS. Abnormal functioning of interneurons is likely to be the underlying cause of some, if not many, human nervous system diseases. However, very little is known of the precise anatomy and function of interneurons, which genes control their development, and how these functions are ....The central nervous system (CNS) is the most complex organ in the body. The vast majority of nerve cells in the CNS are classified as 'interneurons'. These cells relay sensory information and motor commands within the CNS. Abnormal functioning of interneurons is likely to be the underlying cause of some, if not many, human nervous system diseases. However, very little is known of the precise anatomy and function of interneurons, which genes control their development, and how these functions are maintained in the adult. This has been largely due to a lack of efficient and reliable methods to identify and study interneurons. We have previously discovered that a gene termed Sox14 is active in distinct interneuron groups in the embryonic brain and spinal cord. Sox14 is a member of the Sox gene family, many of which act as genetic switches to control cell and tissue development. We found that Sox14 has been extremely well conserved throughout evolution and is active in similar interneuron groups in a number of animal species. These studies led us to hypothesise that Sox14 controls a critical molecular step in the generation of certain interneurons that may be involved in reflexes, locomotion or motor coordination. In this project, we will investigate both the role of Sox14 in interneuron development and the functions of interneurons in which this gene is active. We will do so by combining modern molecular and genetic techniques with physiological approaches. This project will reveal critical molecular steps in CNS development and determine the functions of a specific group of interneurons. To this end, we will generate mouse strains in which a specific group of interneurons are genetically marked and can be manipulated during development. We envisage that these mice with 'modified brain circuits' will become unique resources for future investigations of selected interneuron types and their functions.Read moreRead less
I work on mitochondrial diseases, which are inherited disorders of metabolism that block conversion of food energy into chemical energy needed by our cells. We focus on understanding (i) the genetic basis of these disorders using approaches such as massively parallel sequencing, systems biology and experimental studies, and (ii) the detailed mechanisms of disease by studying cell lines from patients and animal models. We aim to develop better methods for diagnosis, treatment and prevention.
Novel Gene Identification And Characterisation In Epilepsy.
Funder
National Health and Medical Research Council
Funding Amount
$303,964.00
Summary
Epilepsy is a serious neurological disorder affecting up to 5% of the population at some point in their lives. Approximately 70% cases of epilepsy are genetic, but very few of the genes involved have been identified. This project will use state-of-the-art techniques to identify genetic mutations causing an inherited form epilepsy affecting infants. This research is expected to reveal new gene families involved in the genesis of epilepsy and thus new targets for the development of treatments.
The Role Of The Neuronal Splicing Factor A2BP1 In Autism Spectrum Disorders
Funder
National Health and Medical Research Council
Funding Amount
$396,412.00
Summary
Autism spectrum disorders (ASD) are characterized by language deficits, social impairments and repetitive-restrictive behaviors. ASD is one of the most highly heritable neuropsychiatric conditions, and at the same time genetically very heterogeneous. We have recently shown that shared gene expression abnormalities can be identified in postmortem brain from ASD patients. We now propose to investigate the mechanisms and functional consequences of gene expression abnormalities in ASD.
Investigating The Pathogenic Mechanism Of Mutations In IQSEC2 Causing Non-syndromic Intellectual Disability.
Funder
National Health and Medical Research Council
Funding Amount
$449,016.00
Summary
Intellectual disability is frequent in the population, as many as 1 in every 50 people in the world affected. Mutations in IQSEC2, an X-chromosome gene, cause intellectual disability. We will screen 1000 families with this disability for mutations in IQSEC2, building the picture of disease symptoms, contributing to informed genetic counselling. We will investigate functional impacts of these mutations in neuronal cultures, increasing our understanding of the causes of intellectual disability.
Approaches To Therapy For The Skeletal Muscle Actin Diseases
Funder
National Health and Medical Research Council
Funding Amount
$912,078.00
Summary
We have shown that errors in a crucial muscle protein called actin cause muscle diseases that affect newborn children. These diseases are mainly very severe, causing death within the first year of life. Currently there is no cure. This project will investigate possible therapies for these diseases, such as viral delivery of a normal version of actin and finding a drug to overcome the weakness. Successful outcomes will crucially bring treatment closer for the patients.