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Although the physiological meaning of the high potential of mouse embryonic stem cells (ESCs) for meiotic entry is not understood, a rigid safeguarding system is required to prevent ectopic onset of meiosis. PRC1.6, a non‐canonical PRC1, is known for its suppression of precocious and ectopic meiotic onset in germ cells and ESCs, respectively. MGA, a scaffolding component of PRC1.6, bears two distinct DNA‐binding domains termed bHLHZ and T‐box. However, it is unclear how this feature contributes to the functions of PRC1.6. Here, we demonstrated that both domains repress distinct sets of genes in murine ESCs, but substantial numbers of meiosis‐related genes are included in both gene sets. In addition, our data demonstrated that bHLHZ is crucially involved in repressing the expression of  Meiosin , which plays essential roles in meiotic entry with  Stra8 , revealing at least part of the molecular mechanisms that link negative and positive regulation of meiotic onset.

Two DNA binding domains of MGA act in combination to suppress ectopic activation of meiosis‐related genes in mouse embryonic stem cells