We are able to identify and discriminate objects in the world because of exquisitely detailed and rapid processing of sensory information by neurons in the cortex of the brain. In this project we will examine these operations in neurons in the cortex that receive input from the large face whiskers of the rat. These whiskers are used for fine-grain discrimination and for gauging distance. They are deflected by being actively moved, under muscle control, over objects (active touch) or by being pas ....We are able to identify and discriminate objects in the world because of exquisitely detailed and rapid processing of sensory information by neurons in the cortex of the brain. In this project we will examine these operations in neurons in the cortex that receive input from the large face whiskers of the rat. These whiskers are used for fine-grain discrimination and for gauging distance. They are deflected by being actively moved, under muscle control, over objects (active touch) or by being passively deflected by objects. Deflection results in inputs to the brain that are processed to form the neural basis for very finely detailed perceptual behaviour. In rats, with impoverished visual and auditory senses, the whiskers are the major sensory system for interacting with the world, and are used in navigating the environment and in finding and distinguishing foods. Thus they contribute strongly to the remarkable success of this species. This elegant sensory system has a number of advantages that make it a very good model for the study of brain mechanisms responsible for active fine-grain sensory function. We plan to take advantage of the unique features of this system to define the information processing that occurs in the cortex in this elegantly complex system. This will address an issue relevant to all sensory systems - namely the neural basis of complex fine grain perceptual behaviour. Understanding the mechanisms underlying active tactile perception also has relevance to clinical conditions involving deficits in active touch e.g., in diabetic polyneuropathy (which eventually affects ~50% of diabetics), in leprosy (in which an early sign is damage to active touch). Knowledge of the core brain processes in active touch gained in this study could eventually underpin the ameliorative technologies for such deficits.Read moreRead less
Neogenin: A Regulator Of Neuronal Differentiation And Migration In The Adult Brain
Funder
National Health and Medical Research Council
Funding Amount
$334,053.00
Summary
Conditions such as Alzheimer�s and Huntington�s diseases, as well as stroke, represent a major burden of disease in Australia. One goal of modern neurobiology is to harness the brain's ability to make new neurons so that we can replace those damaged by disease or injury. We will investigate how an important developmental molecule, Neogenin, promotes the production of new neurons in the adult brain. A second goal is to show that Neogenin can be activated to promote the repair of the damaged brain ....Conditions such as Alzheimer�s and Huntington�s diseases, as well as stroke, represent a major burden of disease in Australia. One goal of modern neurobiology is to harness the brain's ability to make new neurons so that we can replace those damaged by disease or injury. We will investigate how an important developmental molecule, Neogenin, promotes the production of new neurons in the adult brain. A second goal is to show that Neogenin can be activated to promote the repair of the damaged brain.Read moreRead less
The Development Of Glial Cells In The Sympathetic Nervous System
Funder
National Health and Medical Research Council
Funding Amount
$372,025.00
Summary
Nervous system development entails the co-ordinated multiplication of a small number of founder cells to give the millions of cells of the mature nervous system. Each founder generates a many different cell types. Understanding how this is controlled is among the most challenging problems in modern biology. We will show how the development of the two basic cell types (neurons and glia), is controlled in a part of the nervous system that is relatively simple and accessible for manipulation.
Identification Of Genes Involved In Neural Crest Development
Funder
National Health and Medical Research Council
Funding Amount
$482,310.00
Summary
Knowledge of the genes that during embryonic development control the way our bodies form is necessary to understanding how our body systems function in health and disease. However, research on the developmental genetics of vertebrates, including humans, has proceeded very indirectly, mostly by looking for genes similar to those found in other biological systems, most notably the fruit fly. The significance of this research is that it will identify developmental genes directly from the chosen ver ....Knowledge of the genes that during embryonic development control the way our bodies form is necessary to understanding how our body systems function in health and disease. However, research on the developmental genetics of vertebrates, including humans, has proceeded very indirectly, mostly by looking for genes similar to those found in other biological systems, most notably the fruit fly. The significance of this research is that it will identify developmental genes directly from the chosen vertebrate body system as it develops. As a body system we will choose one of the most basic building blocks of the very early nervous system. This building block is an embryonic organ called the Neural Crest that later goes on to form important parts of the nervous system, but in addition it also forms major parts of the head and face, glands in the neck, the large arteries leading out from the heart, and pigment cells (melanocytes) in the skin. It is particularly important to gain insight into development of this organ because the tissues that derive from the neural crest are the most at risk for birth defects and for childhood cancers. Knowledge of neural crest development also tells us about our own evolution, because the neural crest is the only major system found only in vertebrates including humans.Read moreRead less