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Unravelling The Molecular Basis Of Amyotrophic Lateral Sclerosis
Funder
National Health and Medical Research Council
Funding Amount
$342,325.00
Summary
The only known causes of ALS are gene mutations. State-of-the-art technologies will be used to find genetic causes of ALS to add to existing diagnostic testing and facilitate investigation into disease mechanism. ALS patients experience different disease courses, with variable age of onset, progression and duration of disease even among those with identical gene mutations. We will examine a well-characterised ALS patient cohort with differing disease manifestations to identify disease modifiers.
One Australian dies of Motor Neuron Disease (MND) every day. MND is likely to be due to a genetic susceptibility to an environmental agent such as a toxin or a virus. Recent advances in gene therapy have emphasised the urgent need to find the gene abnormalities in MND. We propose to set up an Australia-wide DNA Bank for MND to allow researchers to look for genetic abnormalities and environmental influences in this disease.
Investigation Of Dysfunction Of OPRS1, A Novel Gene Implicated In Neurodegeneration
Funder
National Health and Medical Research Council
Funding Amount
$535,471.00
Summary
A new gene has recently been discovered to play an important role in various brain and nerve degeneration disorders, including frontotemporal dementia and motor neuron disease. The aim of this project is to discover what biological processes are involved when this gene malfunctions, as this will provide knowledge important for development of new treatments for the many people worldwide affected with these disorders.
Biological Characterisation Of The Opiod Receptor Sigma 1 Gene In The Frontotemporal Dementia And Motor Neuron Disease
Funder
National Health and Medical Research Council
Funding Amount
$480,211.00
Summary
Frontotemporal dementia (FTD) and motor neuron disease (MND) are the two common causes of dementia and neurodegeneration. We have identified a new genes that causes familial FTD and MND in pedigrees affected with dementia and-or MND.This project will study the expression and function of this new FTD-MND gene to determine its role in the aetiology and pathology of this complex of neurodegenerative disorders.
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
Genetic Bases For Charcot-Marie-Tooth And Hereditary Sensory Type 1 Neuropathies
Funder
National Health and Medical Research Council
Funding Amount
$618,055.00
Summary
This project aims to identify the defective gene in a hereditary disease of peripheral nerve. The hereditary disorders of peripheral nerve form the commonest group of human genetic diseases, collectively called Charcot-Marie-Tooth neuropathy. Although few hereditary nerve diseases are fatal most cause lifelong disability. All cause weakness of the lower legs and later weakness and wasting of the muscles of the arm and hand. Affected individuals have difficulty running, frequent falls with gradua ....This project aims to identify the defective gene in a hereditary disease of peripheral nerve. The hereditary disorders of peripheral nerve form the commonest group of human genetic diseases, collectively called Charcot-Marie-Tooth neuropathy. Although few hereditary nerve diseases are fatal most cause lifelong disability. All cause weakness of the lower legs and later weakness and wasting of the muscles of the arm and hand. Affected individuals have difficulty running, frequent falls with gradually increasing disability eventually requiring splints and other walking aids. We propose to use the newly developed resources of the human genome project to locate the defective gene. In previous studies we have used these methods to locate the defective genes of 2 other hereditary diseases of nerve. In this study we propose to investigate a newly recognised form of CMT called intermediate CMT. Intermediate CMT has characteristics intermediate between the better known forms of CMT affecting the nerve itself (the axon) or the nerve insulation (the surrounding myelin sheath). The disorder may therefore affect both components of nerve. The affected gene may mediate communication between the nerve and its sheath. This research should give valuable insight into the mechanisms responsible for the maintenance of normal nerve. Finding the gene may therefore have relevance to many other diseases of nerve. This research is a systematic search and should lead to the abnormal gene causing the disease. Once the gene involved is known then an effective test will be developed. When we can test for the disease, we probably will find that the disorder is much more common than previously recognised. Knowledge of the function of this gene will lead to an understanding of how the disease develops and will eventually lead to effective treatments.Read moreRead less
The Molecular Basis For Target Selection In The Central Nervous System By Sensory Axons
Funder
National Health and Medical Research Council
Funding Amount
$251,325.00
Summary
The normal function of the brain depends upon the specific connections that nerve cells make with each other. These connections are set up in the developing embryo when nerve cells send out long processes - axons - which grow towards their synaptic targets. How axons select their correct targets from amongst the millions of alternatives in the developing brain is unknown. A better understanding of this problem will help us develop therapies to assist regenerating axons re-establish correct conne ....The normal function of the brain depends upon the specific connections that nerve cells make with each other. These connections are set up in the developing embryo when nerve cells send out long processes - axons - which grow towards their synaptic targets. How axons select their correct targets from amongst the millions of alternatives in the developing brain is unknown. A better understanding of this problem will help us develop therapies to assist regenerating axons re-establish correct connections following injury to the brain or spinal cord. We propose to use a simple model system, the embryo of the fruitfly Drosophila, to find molecules that are involved in this process of neuron target recognition - ' axon targeting' molecules - and to study how they work. Drosophila can be genetically manipulated in ways not possible in higher animals. Furthermore the simplicity of its nervous system means that we can determine the connections of individual nerve cells with a high degree of precision. In the first part of our project, we will examine Drosophila embryos that carry mutations in genes suspected to code for targeting molecules. We will stain individual sensory nerve cells in these embryos with dyes to reveal the anatomy of their axons in the brain. If sensory axons terminate abnormally in the brain of a given mutant, the affected gene is likely to code for an axon targeting molecule. In the second part of the study, we will investigate the functions of candidate axon targeting molecules using two approaches. Firstly, we will seek to determine whether the molecule acts in the sensory axons or in their target cells. Secondly, we will use time-lapse microscopy to study how the homing behaviour of the sensory axons is affected in mutant embryos. The results of these studies will lead us closer to an answer to the question: How do axons recognise their specific target cells in the brain?Read moreRead less
Gene Discovery And Pathobiology In Muscle Diseases
Funder
National Health and Medical Research Council
Funding Amount
$425,048.00
Summary
I aim to find the genetic causes of muscle diseases that are lethal or severely debilitating. These diseases result in a significant burden to the affected individuals and their families and also on Australia’s Health care system. A genetic diagnosis provides families with answers, allows family planning, such that couples do not have another affected child, enables appropriate clinical management and gives researchers evidence as to how to develop treatments.