Therapeutic Induction Of Dytrophin-positive Revertant Fibres In The Mdx Mouse
Funder
National Health and Medical Research Council
Funding Amount
$454,825.00
Summary
Revertant fibres are low-abundance, dystrophin-positive fibres found in muscle of DMD patients and animal models. These fibres appear to have a selective advantage over dystrophin negative fibres, as they accumulate with age. Characterisation of dystrophin mRNA has identified in-frame transcripts missing multiple exons, which either exclude a nonsense mutation or restore the reading frame around a deletion. We have designed antisense oligonucleotides (AOs) to bind regions flanking the exon conta ....Revertant fibres are low-abundance, dystrophin-positive fibres found in muscle of DMD patients and animal models. These fibres appear to have a selective advantage over dystrophin negative fibres, as they accumulate with age. Characterisation of dystrophin mRNA has identified in-frame transcripts missing multiple exons, which either exclude a nonsense mutation or restore the reading frame around a deletion. We have designed antisense oligonucleotides (AOs) to bind regions flanking the exon containing the dystrophin mutation in the mdx mouse. The AOs interfere with processing of the pre-mRNA to exclude the mutation and allow a slightly shortened dystrophin to be synthesised. The use of AOs to modify RNA processing allows the gene to function under the control of natural regulatory elements. We have shown that AOs can induce dystrophin expression and improve strength in dystrophic (mdx) mouse hindlimb muscles. We aim to improve upon these results by using AOs to block splice sites flanking consecutive exons, in order to induce dystrophin which mimics that of revertant fibres. As most revertant transcripts are missing multiple exons, we believe that the functional capacity of AO-induced dystrophin can be improved upon by removing multiple exons. An mdx mouse skeletal muscle cell line is used for evaluation AOs. However, in order to determine the efficacy of the induced dystrophin in cardiac and skeletal muscle, experiments must be performed on mice. Previous work, in vitro and in muscles of mdx mice have validated this approach. Combinations of AOs which show promise will be delivered by a) intravascular injection b) intraperitoneal injection in mdx mice. The efficacy of the treatment will be assessed by both continual and end point analysis, which includes physiological, clinical, molecular and histological testing. Particular attention will be directed to the well-being of the mice and any adverse side effects which may occur.Read moreRead less
Targeting The Oncoprotein MDMX As A Novel Treatment For Triple Negative Breast Cancer
Funder
National Health and Medical Research Council
Funding Amount
$561,672.00
Summary
Breast cancer (BrCa) is a leading cause of cancer death in women worldwide. BrCas unable to respond to current therapies have the worst outcomes. We propose a novel strategy to treat these cancers, based on our new findings. Our two protein targets are: (1) MDMX, that we found drives BrCa with its partner, (2) mutant p53, which causes cancer spread. We plan to directly target these drivers of aggressive BrCas, using new drugs that individually show great promise in trials in a number of cance
Targeting Complement C5a Receptor 2 As A Disease-modifying Treatment For Motor Neuron Disease
Funder
National Health and Medical Research Council
Funding Amount
$636,329.00
Summary
Motor neuron disease (MND) is a devasting terminal condition that has no effective treatment. We have identified a novel drug which inhibits an immune protein that can potentially treat MND. In this project we will test this drug in rodent models of MND, and validate its effectiveness in relevant MND immune cells. Ultimately, this project will identify a new potential drug for MND.
Splice Correction As A Treatment For Rare Diseases
Funder
National Health and Medical Research Council
Funding Amount
$824,316.00
Summary
We propose that a strategy of bringing effective and personalised treatments to amenable patients with rare genetic diseases, though ambitious, is readily achievable and opportune. Importantly, a consensus approach will facilitate expediting potentially curative treatments for many patients with rare diseases that would be unlikely to be commercially viable if considered individually.
Targeted Alternative Splicing: A Common Therapeutic Platform To Treat Inherited Diseases
Funder
National Health and Medical Research Council
Funding Amount
$797,165.00
Summary
Genes consist of exons (protein coding domains) separated by introns (non-coding intervening sequences). It is now evident that not every exon need be included in the gene message to direct synthesis of a functional gene product. This application seeks to identify which exons are essential for gene function and those exons that are "dispensable". Such information will allow personalized therapies to be developed based on splice switching, as we have done for Duchenne muscular dystrophy.