Repression of facultative heterochromatin is essential for developmental processes in numerous organisms. Methylation of histone H3 lysine 27 (H3K27) by Polycomb repressive complex 2 is a prominent feature of facultative heterochromatin in both fungi and higher eukaryotes. Although this methylation is frequently associated with silencing, the detailed mechanism of repression remains incompletely understood. We utilized a forward genetics approach to identify genes required to maintain silencing at facultative heterochromatin genes in
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Mumford et al. (2024) studied this question.
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