Abstract:Epigenetic mechanisms mediate diverse gene expression programs in growth and development. Here we report a protein-based epigenetic element, a prion, formed by the conserved DNA helicase Mph1/FANCM. [MIX+] is a cytoplasmically inherited state with propagation driven by the non-amyloid prion templating of Mph1. [MIX+] provides resistance to DNA damage, a gain-of-function trait that requires helicase activity. [MIX+] reduces mitotic mutation rates, but promotes meiotic crossovers, driving measurable phenotypic d… Show more
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