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The expansion of GGGGCC repeats within the first intron of C9ORF72 constitutes the most common cause of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). Through repeat-associated non-ATG translation, these expansions are translated into dipeptide repeats (DPRs), some of which accumulate at nucleoli and lead to cell death. We here performed a chemical screen to identify compounds reducing the toxicity of ALS-related poly(PR) peptides. Our screening identified sodium phenylbutyrate, currently in clinical trials, and BET Bromodomain inhibitors as modifiers of poly(PR) toxicity in cell lines and developing zebrafish embryos. Mechanistically, we show that BET Bromodomain inhibitors rescue the nucleolar stress induced by poly(PR) or actinomycin D, alleviating the effects of the DPR in nucleolus-related functions such as mRNA splicing or translation. Our work suggests that BET Bromodomain inhibitors might have beneficial effects in diseases linked to nucleolar stress such as ALS/FTD.
Pubmed ID: 30527999 RIS Download
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Software tool to enable biologists without training in computer vision or programming to quantitatively measure phenotypes from thousands of images automatically. It counts cells and also measures the size, shape, intensity and texture of every cell (and every labeled subcellular compartment) in every image. It was designed for high throughput screening but can perform automated image analysis for images from time-lapse movies and low-throughput experiments. CellProfiler has an increasing number of algorithms to identify and measure properties of neuronal cell types.
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