<i>Tcl1</i> coordinately promotes metabolic shift and regulates totipotency exit

During early embryonic development, particularly in the transition from totipotency to pluripotency, energy metabolism is closely linked to cell fate. However, the essential regulators of energy metabolism in this transition remain unclear. In this study, we reveal that <i>Tcl1</i> influences energy metabolic characteristics and regulates the totipotency-pluripotency transition. Our findings demonstrate that the absence of <i>Tcl1</i> triggers the upregulation of totipotency genes and reduces H3K4me3 modifications at glycolysis enzyme promoters, thereby suppressing glycolytic processes. Furthermore, we found that a reduction in AKT, a downstream target of <i>Tcl1</i>, is associated with activation of the 2C gene and consequent shifts in energy metabolism. Specifically, AKT inhibition leads to succinate accumulation, further highlighting the role of succinate in the cell fate transition. Our findings underscore the central role of <i>Tcl1</i>-AKT-succinate axis in regulating totipotency and pluripotency through coordinated energy metabolic pathways.