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Identifying The Pathological Mechanism Of Polyalanine Expansion Mutations In The X-linked Hypopituitarism Gene SOX3
Funder
National Health and Medical Research Council
Funding Amount
$402,846.00
Summary
Mental retardation (MR) is a debilitating disorder which affects 1-3% of the population. In many cases, MR results from changes (mutations) in genes which regulate the development of the brain before birth. We are studying families with an inherited form of MR termed X-linked Hypopituitarism (XH) in which only boys are affected. In addition to intellectual disability, boys with XH also have poor pituitary function resulting in short stature and slow metabolism. In severe cases, where the pituita ....Mental retardation (MR) is a debilitating disorder which affects 1-3% of the population. In many cases, MR results from changes (mutations) in genes which regulate the development of the brain before birth. We are studying families with an inherited form of MR termed X-linked Hypopituitarism (XH) in which only boys are affected. In addition to intellectual disability, boys with XH also have poor pituitary function resulting in short stature and slow metabolism. In severe cases, where the pituitary has failed to form completely, these babies are extremely ill and in some instances do not survive. We have previously shown that XH is due to an unusual change in the SOX3 gene in which the number of consecutive alanine residues is increased above a critical threshold (polyalanine expansion mutations). Similar mutations have recently been identified in several other genes that also cause severe birth defects. However, little is currently known about how polyalanine expansion mutations cause these disorders. The overall aim of this proposal is generate a mouse model for this disorder. Analysis of these mice will help us to answer many unresolved questions about this disorder including: How does the mutant protein cause this disorder? Which parts of the brain and pituitary are affected and how is their function altered? How does the mutant protein affect other genes and proteins in the cell? Ultimately, we hope that this mouse model will help us to develop new and improved therapies for XH and other disorders that are caused by alanine expansion mutations.Read moreRead less
Functional Analysis Of The X-linked Hypopituitarism (XH) Gene SOX3
Funder
National Health and Medical Research Council
Funding Amount
$331,000.00
Summary
Many of the processes that are essential for normal bodily function such as growth, the ability to cope with stress, sexual organ development and metabolism are controlled by the pituitary gland. This organ is located at the base of the brain and regulates these bodily functions through the release of six different hormones. Formation of the pituitary gland occurs during development of the foetus. This process requires a specific set of genes that shape the pituitary and allow the hormone-secret ....Many of the processes that are essential for normal bodily function such as growth, the ability to cope with stress, sexual organ development and metabolism are controlled by the pituitary gland. This organ is located at the base of the brain and regulates these bodily functions through the release of six different hormones. Formation of the pituitary gland occurs during development of the foetus. This process requires a specific set of genes that shape the pituitary and allow the hormone-secreting cells to arise. Changes in these pituitary formation genes results in dysfunction of the pituitary (hypopituitarism) in newborn babies. In severe cases, where the pituitary has failed to form completely, these babies are extremely ill and in some instances do not survive. We are studying families with an inherited form of hypopituitarism in which only male children are affected. This disorder is due to the presence of an extra piece of genetic material (DNA) on the X chromosome. We have recently discovered that one of the duplicated genes, SOX3, causes this disorder. The overall aim of this proposal is to understand how SOX3 causes hypopituitarism by generating a mouse model for this disorder. Analysis of this mouse model will help us to understand the clinical features of hypopituitarism and may allow us to identify previously uncharacterised anatomical defects associated with this disorder. Ultimately,we hope to develop new and improved therapies for hypopituitarism using this mouse model.Read moreRead less