The (GGGGCC)n repeat expansion in C9orf72, which is the most common cause of frontotemporal dementia and amyotrophic lateral sclerosis, is translated through repeat-associated non-AUG (RAN) translation. In this issue of Neuron, Cheng et al. (2019) report that the helicase DDX3X, which unwinds (or relaxes) RNA, suppresses RAN translation and toxicity.
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