The catalytic-independent function of LSD1 modulates the epigenetic landscape of mouse embryonic stem cells
Malla, S.; Kumari, K.; Martinez-Gamero, C.; Garcia-Prieto, C. A.; Stransky, S.; Caroli, J.; Alvarez-Errico, D.; Saiki, P. A.; Lai, W.; Lyu, C.; Gilthorpe, J. D.; Wang, H.; Sidoli, S.; Mattevi, A.; Mateus, A.; Esteller, M.; Roman, A.; Aguilo, F.
Show abstract
Lysine-specific histone demethylase 1 (LSD1), which demethylates mono- or di-methylated histone H3 on lysine 4 (H3K4me1/2), is essential for early embryogenesis and development. Here we show that LSD1 is dispensable for embryonic stem cell (ESC) self-renewal but is required for ESC growth and differentiation. Reexpression of a catalytically-dead LSD1 (LSD1MUT) recovers the proliferation capability of ESCs, yet the enzymatic activity of LSD1 is essential to ensure proper differentiation. Indeed, a gain of H3K4me1 in Lsd1 knockout (KO) ESCs does not lead to major changes in global gene expression programs related to stemness. However, ablation of LSD1 but not LSD1MUT results in decreased DNMT1 and UHRF1 proteins coupled to global hypomethylation. We show that both LSD1 and LSD1MUT control protein stability of UHRF1 and DNMT1 through interaction with the ubiquitin-specific peptidase 7 (USP7) and, consequently, inhibiting DNMT1 and UHRF1 ubiquitylation. Our studies elucidate for the first time a novel mechanism by which the scaffolding function of LSD1 controls DNA methylation in ESCs.
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