SCA3 Studied in C. Elegans with Grant from NAF

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by Maureen Newman |

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Joining Friedreich’s Ataxia in the list of ataxias is spinocerebellar ataxia type 3 (SCA3), also known as Machado-Joseph disease. This disease is caused by mutations in the gene encoding protein ataxin-3 (ATXN3), unlike Friedreich’s ataxia, which is caused by a mutation in the gene encoding frataxin protein (FXN). Similar to patients with Friedreich’s ataxia, those with SCA3 experience progressive movement incapability as a result of neurological problems.

The National Ataxia Foundation provides support to research groups who study ataxias such as SCA3 and Friedreich’s ataxia. Recently, the foundation awarded funding for FY 2015 to a research group in Braga, Portugal at the University of Minho. Andreia Teixeira-Castro, PhD, leader of the research group, received the research seed money grant for her work “Determinants of Neuron-Specific Pathogenesis: Study in a C. elegans Model of SCA3.”

Dr. Teixeira-Castro, like many other scientists, uses the worm C. elegans due to its simplicity and entirely known genome. Key to her work is the well characterized nervous system, which is composed of 302 neurons, and its transparency. This allows her to monitor neurons  in real time much more easily than in a mouse model and at a larger scale (in terms of quantity), as well.

“Currently there is no effective treatment for [SCA3],” stated Dr. Teixeria-Castro in her abstract. “In this project, we are interested in understanding why mutant ataxin-3 protein, despite being present nearly in all regions of the human body including the brain, seems to affect and cause death of specific cells of the brains (neurons) and not to all.”

To solve this conundrum, members of Dr. Teixeira-Castro’s laboratory induce mutant human ataxin-3 protein expression in C. elegans and literally watch the effects. They can see ataxin-3 protein aggregation and abnormal movement in the worms as a result of the mutation. To determine which specific neurons of the 302 total neurons are affected by mutant human ataxin-3, the team will isolate neurons with ataxin-3 aggregates and analyze their RNA molecules.

“From this work, we hope to identify new players, which will help us to better understand the intriguing pattern of neurodegeneration and we believe that those molecules may constitute new cellular targets for the development of new therapies for SCA3,” wrote Dr. Teixeira-Castro. Goals such as these are the reasons why the National Ataxia Foundation grants research groups funding.