| Summary: | Abstract Background Small nucleolar RNA host gene 3 (Snhg3) is a long non-coding RNA (lncRNA) that was shown to participate in the tumorigenesis of certain cancers. However, little is known about its role in embryonic stem cells (ESCs). Methods Here, we investigated the role of Snhg3 in mouse ESCs (mESCs) through both loss-of-function (knockdown) and gain-of-function (overexpression) approaches. Alkaline phosphatase staining, secondary colony formation, propidium iodide staining, western blotting, and quantitative reverse transcription polymerase chain reaction (qRT-PCR) were used to access self-renewal capacity, whereas immunofluorescence, qRT-PCR, and embryoid body formation were performed to examine pluripotency. In addition, the effect of Snhg3 on mouse embryonic development was determined based on the morphological changes, blastocyst rate, and altered pluripotency marker (Nanog, Oct4) expression. Moreover, the relationship between Snhg3 and key pluripotency factors was evaluated by chromatin immunoprecipitation qPCR, qRT-PCR, subcellular fractionation, and RNA immunoprecipitation. Finally, RNA pull-down and mass spectrometry were applied to explore the potential interacting proteins of Snhg3 in mESCs. Results We demonstrated that Snhg3 is essential for self-renewal and pluripotency maintenance in mESCs. In addition, Snhg3 knockdown disrupted mouse early embryo development. Mechanistically, Snhg3 formed a positive feedback network with Nanog and Oct4, and 126 Snhg3-interacting proteins were identified in mESCs. Conclusions Snhg3 is essential for mESC self-renewal and pluripotency, as well as mouse early embryo development.
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